• New Discovery Could Improve Organic Solar Cell Performance

    While there is a growing market for organic solar cells ­­– they contain materials that are cheaper, more abundant, and more environmentally friendly than those used in typical solar panels – they also tend to be less efficient in converting sunlight to electricity than conventional solar cells. Now, scientists who are members of the Center for Computational Study of Excited-State Phenomena in Energy Materials (C2SEPEM) a new Read More
  • Know Your Rights

    Arizona law protects individual homeowners’ private property rights to solar access by dissolving any local covenant, restriction or condition attached to a property deed that restricts the use of solar energy. This law sustained a legal challenge in 2000. A Maricopa County Superior Court judge ruled in favor of homeowners in a lawsuit filed by their homeowners association seeking to force the homeowners to remove Read More
  • Home Battery Systems

    Rooftop solar panels are common in Arizona thanks to abundant sunshine, but to get even more use from the technology, homeowners are beginning to pair them with large home batteries. Batteries allow homeowners to store their surplus electricity, rather than send it to the grid in exchange for credit from their electric company. Read More
  • Solar Hot Water

    There are two types of solar water heating systems: active, which have circulating pumps and controls, and passive, which don't. The typical solar water heater is comprised of solar collectors and a well-insulated storage tank. The solar collector is a network of pipes that gathers the sun's energy, transforms its radiation into heat, and then transfers that heat to either water or a heat-transfer fluid. Read More
  • Federal Residential Renewable Energy Tax Credit

    (Information provided by DSIRE - Last reviewed 02/19/2009) The information below is somewhat dated, the incentives have been extended, but reduced.  See our more up to date article. Incentive Type:   Personal Tax Credit State:   Federal Eligible Renewable/Other Technologies:   Solar Water Heat, Photovoltaics, Wind, Fuel Cells, Geothermal Heat Pumps, Other Solar Electric Technologies Applicable Sectors:   Residential Amount:   26% Maximum Incentive:   Solar-electric systems Read More
  • Solar Building Design in Arizona

    The idea of using the sun to meet the energy needs in our buildings has been with us since the time of the Greeks, with some of the design manifestations even evident in the prehistoric structures of Arizona and the Southwest. There is a great historic tradition for Arizona buildings that utilize our most abundant resource, and the current increases in The idea of using Read More
  • How Not to- Battery Connections

    Photo shows the situation after a battery discharge test at 300 amps was terminated on a 1530 AH IBE battery string when one post melted. During the discharge test all cell voltages are logged. The sum of the cell voltages was 2.73 volts lower than the 48-volt string voltage. This is an average of 118 mv per inter-cell connection, 5-10 mv is the normal range Read More
  • 1 New Discovery Could Improve Organic Solar Cell Performance
  • 2 Know Your Rights
  • 3 Home Battery Systems
  • 4 Solar Hot Water
  • 5 Federal Residential Renewable Energy Tax Credit
  • 6 Solar Building Design in Arizona
  • 7 How Not to- Battery Connections

Blogs

  1. Solar Center Blog
Brian Czech
17 February 2019

What’s Really Green and What’s Really New

Ask Americans what the Green New Deal is all about, and you’ll get two basic answers. Most often you’ll hear, “It’s about moving to renewable energy in order to fight climate change.” You’ll also hear, from a camp further right, “It’s all about socialism!”

Lucy Mason
06 January 2018

Wishing you a wonderful and Happy New Year!

The year 2017 has gone by quickly, and AriSEIA has accomplished a full and active agenda to further solar and renewable energy in Arizona. 


Featured (Note- Articles below shift Left-Right)

Some things to pay attention to in Arizona


Arizona Legislature 

Not in session

Arizona Corporation Commission 

The Arizona Corporation Commission (ACC) has posted STAFF'S THIRD REVISED PROPOSED DRAFT RULES (DOCKET no. RE-00000A-18-0284) That lay out a clearer framework for Electric Utilities to report their compliance with the proposed standards for the Renewable Energy Standard, Clean Peak Standard, Distributed Renewable Storage Requirement, and Electric Vehicle Infrastructure.

See the ACC Staff Report: docket.images.azcc.gov/E000004960.pdf

See also Materials Presented by the Joint Stakeholders at the Commission's March 2020 Energy Rules Workshop

ACC Staff has made substantial changes to the draft rules that were filed on July 2, 2019 based on feedback received at each workshop held in this matter, comments to the docket, and a review of relevant energy policies across the United States.

The Nature Conservancy has submitted their report "Arizona Thrives - A Path to a Healthy and Prosperous Future" to the ACC. Interesting.

APS has submitted their report,  The Solar Center has slightly reformatted this report by rotating the pages for easier viewing.  APS has provided two presentations to address the ACC questions. Worth a read.

Update July 30, 2020: 

When the Arizona utility regulators met to decide these issues they deadlocked over whether they should increase the state's requirements for renewable energy. It proved not possible to obtain the agreement of at least three commissioners, the meeting was adjourned.

See the Arizona Republic article on this:  Arizona utility regulators hit roadblock on clean-energy rules, abruptly end meeting.

The Arizona Corporation Commission (ACC) has released the Notice of Final Rulemaking Interconnection of Distributed Generation FacilitiesInterconnection of Distributed Generation Facilities document.

With this rulemaking, the Commission adds a new Article 26, entitled " Interconnection. of Distributed Generation Facilities" to 14 A.A.C. 2, the Chapter containing the Commission's rules for fixed utilities, with the new Article 26 including 28 new rules. The rules for Interconnection of Distributed Generation Facilities ("DGI Rules") establish mandatory technical standards, processes, and timelines for utilities to use for· interconnection and parallel operation of different types of distributed generation ("DG") facilities; customer and utility rights and responsibilities; provisions for disconnection of DG facilities from the distribution system; specific safety requirements; more flexible standards for electric cooperatives; a reporting requirement; and a requirement for each utility to create, submit for initial approval and submit for approval periodically and when revised, and implement and comply with a Commission-approved Interconnection Manual.

The first dozen pages are basically legal stuff.  The document defines how an utility must review, then accept/reject/etc. an application to connect distributed generation to the utility.  It defines both customer rights and utility procedures.  There are a lot of utility, installer and customer comments along with the ACC staff recomendations. 

 Municipality Info

 

PhoenixFireLogo sm

The City of Phoenix is now (January 2020) requiring a special permit from the Fire Department for most solar systems and batteries.  The fees and required plans varies with size and content.  See this link for an application and details:  https://www.phoenix.gov/firesite/Documents/Solar Photovoltaic OTC Bundle Rev 01-2020.pdf

This is in addition to a building permit from the Planning & Development Department and must be separately obtained at a different address (150 South 12th Street) or on-line via the above link. Also noted is that residential PV permits are no longer over the counter and as of March 2020 are estimated to take 29 working days to process.  Separate inspections are required.

The code requirements are contained in Phoenix-Chapter 12 BESS R-3-1.pdf

Also note: All Phoenix solar building permits are now electronic submittal only. Contact the Electronic Plan Review (EPR) Triage Team at 602-534-5933 or epr.support@phoenix.gov. For more information on EPR, visit us at https://www.phoenix.gov/pdd/onlineservices/electronic-plan-review.

Related: PV Rapid Shutdown Signage- Phoenix

.

 At the Federal Level

The US House passed the Moving Forward Act, H. R. 2, on July 1, 2020. The US$1.5 trillion infrastructure support bill includes a raft of measures in support of America’s clean economy. The bill proposes to extend the solar Investment Tax Credit (ITC) scheme to 2025. Major resistance is expected in the Senate.

More details on this bill are at: Solar-friendly US infrastructure bill inches forward as it passes House

Additional coverage: House Democrats Spell Out Climate, Clean Energy Priorities in Sweeping Plan

Update August 4th: 07/20/2020 Senate Received in the Senate.  No action since.  Call your Senators!

The President Trump released a Proclamation  on October 10, 2020 that will increase the tariff on imported solar cells and panels next year.  Bifacial solar panels will officially lose their exemption status.

The solar industry was the first market to feel the hit of tariffs brought on by Trump in 2018. Beginning in February 2018, imported crystalline silicon cells, modules and AC/integrated modules were tariffed 30% as part of a four-year outline. Imports received a 25% tariff in 2019, a 20% tariff in 2020 and were scheduled for a 15% tariff in 2021.

Update (10/15/20):  A U.S. trade court again denied a request by the Trump administration to end a tariff exemption for imported two-sided solar panels. (caution: paywall)

U.S. Court of International Trade Judge Gary Katzmann refused to lift an order preventing the administration from withdrawing an exemption for two-sided, or bifacial, panels The government didn’t follow the law the first time it moved to withdraw the loophole, and it didn’t fix the procedural errors the second time it tried, Katzmann said. Katzmann said he was taking no position on whether the duties would protect the domestic solar industry “Once again, the court merely continues to...

 

 

Utility Information


Arizona Public Service Co. has announced that it plans to produce all of its electricity from carbon-free sources by 2050 and will get 45% of its power from renewable sources like solar and wind by the end of this decade.

This is a good improvement from the point of view of sustainable energy.  There are still a lot of details to be worked out such as the role that distributed energy will take.  Will APS APS improve its policies in regard to residential and small commercial systems.

There are several good news articles and the APS press releases on this announcement:

APS:APS sets course for 100 percent clean energy future

Arizona Republic: APS will eliminate carbon emissions by 2050 and close coal plant ahead of schedule, CEO says

The Washington Post: Arizona’s biggest utility says it will get all of its electricity from carbon-free sources by 2050

 

Tucson Electric Power (TEP) plans to provide more than 70 percent of its power from wind and solar resources as part of a cleaner energy portfolio that will reduce carbon emissions 80 percent by 2035.

TEP has filed its integrated resource plan (IRP) with the Arizona Corporation Commission, outlining plans for 2.5GW of new solar and wind over the next 15 years and 1.4GW of energy storage capacity as it progressively shutters its coal power stations.

See the TEP Press Release for more information: https://www.tep.com/news/tep-plans-clean-energy-expansion-carbon-reduction/

TEP customers intending to install a new PV system now need to check that their system can be safely installed and connected to TEP’s grid.

TEP now has service areas that are saturated with PV systems where new PV systems are subject to additional review and requirements under Arizona’s Distributed Generation Interconnection Rules. TEP has prepared DG Saturation Maps showing these areas.

This further described at https://www.tep.com/get-started-with-solar/

This requirement stems from the recent Distributed Generation Interconnection Rules issued by the Arizona Corporation Commission.

Further information is available at:Interconnection of Distributed Generation Facilities

Update: See the related article on tucson.com: New state rules limit rooftop solar systems in some Tucson neighborhoods

 

 

  

Interesting Technology Updates;

 

 

 

 


Other Announcements

Events

No result.

Interesting Videos

Univ. of Arizona - Institute for Energy Solutions May 2019

Some interesting content from the May 2019 newsletter

UA Institute for Energy Solutions logo

June 7th
10 AM - Noon

Indige-FEWSS mobile water purification unit demonstration

Dr. Karletta Chief, Navajo Nation President, Jonathan Nez, Diné College President, Dr. Charles Roessel, and Diné College Students and Indige-FEWSS fellows will discuss and demo the water purification unit at Diné College, Tsaile Campus.

Water Purification UA

Imagine Adaptation | Finding Solutions fo the Food, Energy, Water, Nexus January 2019, British film company-One World Network, gathered UA researchers and community delegates to answer the question "What is being done to address the big issues at the energy, water, food nexus that will secure our world as we know it for the future?" Out of this exploratory emerged a documentary which takes a look at the many branches of UA's collaborative E-W-F research. We invite you to watch this exciting new video!

Path to Solar

NREL SRP Battery StudyDraft 7 11-26-19

The Arizona Solar Center is often asked the question “How do I find out if solar energy is the right choice for me now?” It seems like a simple question, but the answer really depends on the situation.

There are many ways to use solar energy on both personal and commercial levels. Some of the exciting possibilities for solar electric (photovoltaic or PV) power use are:

  

  • Highway, street, and sign lighting
  • Pool and home accent lighting (especially with the new high efficiency LED lights)
  • Signaling for railroad crossings
  • Gate openers
  • Power for forest or park lookout stations
  • Telemetry packages, instrumentation, weather, earthquake detectors and recorders
  • Power for control of valves in pipelines
  • Gas detection systems in refineries
  • Cathodic protection to prevent corrosion in pipelines, wells, bridges, etc.
  • Lighting in rural areas (restrooms in parks as an example)
  • Security for industrial buildings
  • Power for refrigerators, lights and communications in remote medical centers.
  • Power for water pumps -  commercial, domestic and livestock water, or swimming pools
  • RV power while parked
  • Attic ventilation
  • Security systems
  • Remote and on-grid home power systems

If the previously mentioned uses of lighting, communication, refrigeration, water pumping, etc. are combined into a single power system, renewable energy can be used to provide power for the basic needs of entire villages, encampments, and recreational areas which may be too far from power lines to ever have grid-supplied electricity.

Over the last decade it has become routine to have home solar electric systems that are connected directly to the local utility and operate without batteries. These are called grid-tied systems, and are the focus of most residential and commercial activity. In Arizona there are utility rebates (actually incentives to install, with the resulting environmental credits being assigned to the utilities) that offset a substantial portion of the costs of installing grid-tied PV systems. In some cases this can include domestic hot water systems. Refer to other parts of the Arizona Solar Center website for more information. There is also information here about tax credits and rebates.
To begin answering the question “How do I find out if solar energy is the right choice for me now?” please review the following Frequently Asked Questions. After understanding this basic information, please see our "Path to PV" below, which follows a typical but fictitious family on their journey of learning and finally making the decision to go solar.

Frequently Asked Questions- Is solar energy the right choice for me now?

Q:

A:

Why should I be interested in solar?

  • I want to be more environmentally responsible, using sustainable resources
  • I want to lock in my cost of energy
  • I want to generate my own electricity
  • I want to make a profitable green investment

Q:

A:

What alternatives should be considered?

  • Energy conservation- Invest in more efficient air conditioners, insulated windows, etc.
  • Conduct a home Energy Audit
  • Switch to efficient lighting such as LED bulbs

Q:

 

A:

What are my solar objectives?
Some we have heard:

  • Contribute to the value of the house (tax free equity increase)
  • Make a good return on investment
  • Lock in some of my energy costs in an inflating economy
  • Take advantage of incentives, rebates, and tax credits
  • Get it right the first time
  • Do the best for my family

Q:

A:

Do I have a good site for PV?

Your site must have clear, unobstructed access to the sun. Buildings, trees or other vegetation should not shade your site. South-facing roof exposure is best, but roofs facing east and west may be OK, there is a reduction in output - see Effect of PV Array Orientation - Phoenix AZ. If a rooftop is not available, your PV system can also be mounted on the ground.

 

Q:

A:

Is solar for me?

Some points to consider:

  • Do I own my own home, or can the improvement be moved if necessary?
  • Do I have a suitable area for a solar system?
  • Do I have the cash or financing for the system?

Q:

A:

How much mounting space do I need?

A small PV system can use as little as 50 square feet. A larger system, to meet the needs of a typical household, would use between 300 to 600 square feet. As a rule of thumb, 100 square feet of PV area produces 1 kilowatt of electricity.

Q:

A:

What can I do as a homeowner?

  • Install a Domestic Hot Water (DHW) system
  • Install a grid-tied PV system <possible link that illustrates an example>
  • Install a non grid-tied PV system (attic fan, yard lights, shed power) <possible link>
  • Install a wind energy system (if the location is suitable)
  • Install skylights
  • Install solar pool heating
  • Install a PV Powered Pool Pump
  • Understand your energy usage by getting a summary from your utility (needed later to compare to system output estimates)

Q:

A:

Are there any incentives and rebates available in Arizona?

In Arizona there are no longer any utility based incentives on solar systems. But there are Arizona and Federal tax credits and/or rebates that may apply to your situation. Renewable Energy Incentives

The following is specific to photovoltaic power systems

Q:

A:

Why should I consider buying a PV system?

A PV system reduces or eliminates the amount of electricity you purchase from your utility or electric service provider. A PV system can be an excellent investment, save you money on your electricity bill and act as a hedge against future price increases.

The electricity generated by your PV system is clean, renewable and reliable. You help your community by reducing the load on the utility grid. You can provide additional electricity for the grid when you generate more than you use during the day, when electricity demand is highest.

Q:

A:

How do I relate system size to energy produced?

You can match the size of your system to your electricity needs and budget. The average household in Arizona uses over 10,000 kilowatt-hours (kWh) per year. If your usage is typical of the average household, a system in the 5 to 8 kilowatt (kW) range would be adequate to meet most of your electricity needs. It is usually not advisable to displace your entire utility bill, since efficiency improvements and conservation could cause you to produce more energy than you use. Currently, utilities do not pay competitive rates for generation above annual usage. see Effect of PV Array Orientation - Phoenix AZ. and Considerations in sizing a PV system in Arizona

Q:

A:

What do I need to know about connecting my PV system to the grid?

You will need to enter into an Interconnection Agreement with your utility. This agreement addresses the terms and conditions under which your system will be safely connected to the grid. The agreement also specifies the metering arrangements for any surplus electricity your system generates on the electric grid.

Excess electricity might be generated during the day when your system produces more electricity than you need. Your meter would simply run backwards to record the amount of electricity 'sold' to your utility. If you select a rate plan with Peak and Off-Peak periods, the utility will most likely account for the net metering by rate period. This is very utility specific, see the article Arizona Electric Utility Information.
Older PV systems may have qualified for net metering where in any excess production is banked with the utility for later use.

Q:

A:

How can I estimate the best size system for my home or business?

To estimate the best system size for your home or business, please review our article on Considerations in sizing a PV system in Arizona.
There are ‘Solar calculators’ on the web. APS and SRP have links to calculators that will give ballpark cost and performance estimates. Use these with some common sense as they may not consider rate period and demand charge effects on the resulting savings.

There is also the NREL document: http://www.nrel.gov/docs/fy04osti/35297.pdf

If you want your PV system to meet half of your electricity needs, then you should size it to meet half of your annual electrical usage. Alternatively you can offset only a small portion of your electricity bill with a single PV panel.
First of all, do not install a system that produces more energy on an annual basis than you expect to use because the present utility tariffs generally have a low credit for the excess.
If in doubt, start small and ask the installer to plan for expansion in the future (i.e. install a larger inverter and conduits at little extra cost). However, check on your utility policy on this as any system size changes may cause loss of any favorable grandfathering of buy-back rates.

Q:

A:

What does a typical PV grid-tied system look like?

  • Small home system <link>
  • Medium home system <link>
  • Large home system <link needed>

Q:

A:

How much does a PV system cost?

Although many factors affect the cost, an average PV system costs from $2.50 to $4.50 a watt, including installation. This is about $10,000 to $18,000 for a 4 kW system.

Q:

A:

Am I eligible for a rebate?

At present (2019) there are no incentive rebates. There are tax credits that may apply to your situation, see our article on Renewable Energy Incentives.

Q:

A:

Are there any financing programs available?

The best way to finance a PV system for your home is through a mortgage loan, which includes a primary or secondary mortgage or home equity loan secured by your property. If mortgage financing is not available, look for other sources such as conventional bank loans. In August of 2008, APS announced a financing program for its customers who desired to finance systems installed under their incentive plans. A variety of “leasing” programs are becoming more common in the industry. The buyer is cautioned to do an in-depth financial analysis or consult a qualified party to determine the best approach for his or her system.

Q:

A:

How do I find a PV retailer?

The Arizona Solar Energy Industries Association provides a list of PV retailers and installers. Retailers either can provide installation or can refer you to installation contractors in your area. Try to find a company located in the area where your system will be installed. Price is only one factor when selecting a PV company and/or contractor.

Here are some other considerations:

  • Does the company have experience installing grid-connected systems?
  • How many years has the company been in the business of installing PV systems?
  • Does the company use licensed Arizona contractors?
  • Does the company have any judgments or liens against it?
  • Will the company provide references from previous customers?
  • If you get more than one bid, make sure that the bids are for the same identical size system.

Q:

A:

How do I know if I am being offered quality equipment?

Arizona law requires that PV modules be listed to UL1703, check the data sheet.

Inverters and charge controllers should be listed to UL1741.


PV installations are subject to the National Electrical Code and building permits. Check with your local building permit office to determine which version applies, there is no Arizona statewide policy in this area.


The Solar America Board for Codes and Standards (Solar ABCs) has some good information. See Solar America Board for Codes and Standards (Solar ABCs)

Q:

 

A:

How does it work with my electric utility? How does the billing work? What if I sell the home?

This differs with the utility. Most utilities (e.g. APS, SRP, and TEP) have web sites that can help explain the procedures:(web links)

APS (see also Summary of Residential Rate Plans for APS Customers
SRP
TEP

See our article on Arizona Electric Utility Information for more specific information on utility policies.

Generally, the utility installs a bi-directional kilowatt-hour (KWh) revenue meter that measures power flow in both directions. The resulting bill will usually show how much energy you have used and how much you fed back to the utility. Any balance in your account should be listed for future use.

The utility usually requires the PV system installer to install a socket for a second KWh meter that measures the output of the inverter as well as a lockable disconnect switch in case the utility needs to work on the utility line nearby.

Q:

A:

How do I operate the system?

Generally the systems operate automatically. They do have ON/OFF switches and a utility lockable disconnect switch. Most inverters have a digital display or indicators that show operation. The homeowner should be provided with an operations manual for the system by the installer.


Generally, the natural rain keeps the solar panels clean enough (without calcium deposits from tap water). If desired, they can be cleaned. A hose is usually suitable. Use caution, as this can be dangerous due to the height and a remote possibility of electrical shock.

Q:

A:

What will it look like? Will it affect anything?

Most systems can be installed so that the owners are proud of their investment. <possible link>
Modern inverters must meet radio frequency non-interference specifications and as such should not interfere with radio and TV.

Q:

A:

Can I monitor the system with my computer?

Most, but not all inverters are capable of sending data to a computer for monitoring. An accessory card may be needed. Consult the user manual or your installer for specifics.
Some inverter manufacturers offer web services if the home has internet access. Many homeowners have web pages on the manufacturer’s web site with photos, specifications, comments, and real-time performance data. 

The smart meters used now by APS and SRP (and perhaps other Arizona utilities) gather detailed data on the output of the installed PV system and make this information available to their customers. For example see this article on APS- Understanding your APS Connected Photovoltaic System

Q:

A:

How long will it last? What is the warranty?

Modern systems are reliable and should last 10-25 years before any repair or replacement is needed.

  • Arizona law requires a full two-year warranty by the installer.
  • Most inverters have available extended warranties up to 10 years.
  • Most PV modules have a 20 or 25-year warranty.

Q:

A:

Do I have a suitable roof or ground area?

Effect of shade on PV systems <possible link>
Roof requirements are discussed in the Solar ABCs guide to expedited permitting
What kind of roof can be used? PV mounting systems are compatible with all roof types including tile, shingle, metal and flat.

Q:

A:

What about HOA Approval (when necessary)?

  • Always seek approval
  • State law protects your right to install
  • If you live in an area that is governed by a homeowners association, all improvements on your property must be submitted to the board or Architectural Review Committee for approval. Arizona law protects your right to install solar energy systems; in fact, the Arizona statutes are among the strongest in the nation. Your HOA cannot prevent you from installing your solar energy system, but they can have installation guidelines as long as those guidelines do not increase the cost of the system or decrease the performance or life of the system.
  • Just because the law is on your side, don't make the mistake of installing a solar energy system without approval from your HOA. Your contractor will provide you with the information that you will need to complete the HOA's application and can help you with the application process. If you encounter problems with your HOA, your contractor will also be able to give you advice on how to proceed to ensure that your HOA follows Arizona law and approves your application.

Q:

A:

What about Building Permits?

  • Learn about city inspection & approval requirements
  • There is also utility inspection, approval and commissioning
  • Remember that a licensed contractor must do the installation of your solar energy system. Be sure to check out the record of the contractor who will be installing your system with the Arizona Registrar of Contractors (www.azroc.gov/).
  • Most utilities require a final inspection by the local jurisdiction before they will issue a check under their rebate programs.
  • The Solar America Board for Codes and Standards (Solar ABCs) has developed an expedited permit process for small PV systems. It contains a set of standardized application forms. http://www.solarabcs.org/about/ publications/reports/expedited-permit/forms/index.html

Q:

A:

How to decide on a company?

  • Look at all the factors involved.
  • Does the company have the experience and knowledge to make you feel comfortable?
  • Is the price reasonable?
  • Keep in mind that the lowest bid may “cut corners” and possibly come back with unexpected “adders” and shoddy workmanship. 

Q:

A:

How to proceed?

See “A Path to PV,” below which follows a fictitious family through the process.

 

A Path to PV
 
One day, Sunny and Sam Brightly were driving about town when they saw a home with a large number of solar modules on the roof. It looked pretty expensive.
 
Later while watching tv, they saw an advertisement on a new financing plan being offered to help make the installation of solar systems more affordable. They remarked about it, but took no action at the time.
 
The following week their oldest child came home from school and told them how they had just learned about using sunshine to make electricity. He asked his parents, "Why don't we do something to use solar energy?" The parents said "Let's see what we can find out on the Internet." They searched "Solar Energy" and "Arizona." A top hit was the Arizona Solar Center, so they looked at it. There was a lot of information and various descriptions of programs, including a list of other organizations.
 
Since they had seen news about utility incentives and there were links from their utility’s webpage to solar programs, they followed a link to their utility's solar section and reviewed the basic steps.
 
Using their utility, the Arizona Solar Center, and other sources as references they decided to ask three different companies to make presentations and estimate the cost and performance of potential PV systems that would best fit their home.
 
The interactions with the prospective suppliers varied. Some asked if they already knew the size of the system they would be interested in, but the family wasn’t sure. Others asked about their local utility company, the kind of roof they had, or their typical summer electric bill.  One supplier requested that they ask their utility for a summary of their usage history (easy to get). The Brightly family had questions of their own such as “What will your system cost us after tax credits and how much will we save on our electric bill?”
 
All three suppliers visited the home, took measurements of the roof area, inspected the electrical service and decided on the best place for the inverters. Each approach was different; one supplier presented three basic standard kits with about a two to one range in costs and no specific options. Good looking literature, but only annual performance data.
 
Another supplier arrived with a copy of an aerial photo of the house (obtained from the www.maricopa.gov/assessor web site) with an initial layout of an array of specific PV modules that seemed to fit well. There was a detailed quote for the illustrated layout and an offer that the size could be easily varied and a new quote printed out.
 
The third supplier came out, made measurements, asked some questions, answered many questions and later sent an estimate. A typical form used by suppliers to gather site data is included here as a reference. <link to be made>
 
All three suppliers were either Arizona licensed contractors or used a related contracting company for the installation. All asked about any Home Owner Association (HOA) restrictions, which the Brightly’s did have. All explained the legal situation in Arizona and took photos for future reference.
 
It was determined that the home had a south-facing main roof area with asphalt shingles at a four to twelve tilt (about 24 degrees), and with no shadows on the roof from other homes or trees.  The south side was the back of the house and the electrical service was on the east side of the house with 200-amp service and available space in the circuit breaker panel for a 2-pole breaker. Because of their HOA, the Brightly family also had the requirement of applying for permission from the Architectural Review Committee to install the system.
 
They were now faced with evaluating three differing bids, some with size options. All suppliers offered different brands of PV modules, different inverters, and different mounting kits. This was all very confusing. The family asked for some customer references and even looked at one system that was nearby. They checked the contractor names on the Arizona Registrar of Contractors website (www.azroc.gov/) and all were in good standing with residential electric (R11 or CR11) electric licenses.
 
The Brightly’s used several methods to compare and rank the possible suppliers:
 
Calculated the cost per installed watt for each quotation. This resulted in figures running from $2.30to $4.00 per peak watt (the maximum rated output) prior to any rebates.  Small systems had the higher cost per watt.

For comparison the Brightly's calculated the estimated annual kilowatt-hours per PV array installed. This resulted in figures running from 1,680-1,825 kWh.  The supplier with the higher figure could not give a good reference for the value, while the others stated that their calculated estimate closely matched the measured performance over a few years by a local utility in Phoenix.

They then calculated the cost per estimated annual kilowatt-hour for each quotation. This resulted in figures running from $1.60 to $2.25 per annual kilowatt-hour. 
 
They eliminated the supplier who could not justify the high estimated annual output calculation. The decision between the other two suppliers was more subjective and they decided on the supplier who best answered their questions.
 
They asked the successful supplier back to settle on a specific system size and layout on their home. They asked the supplier if he could help with the HOA application and the supplier agreed and marked up a photo of the home to show the proposed changes.
 
With the signing of a contract and an initial payment, the supplier prepared the basic utility reservation for an incentive payment. Both parties signed the reservation and it was sent in to the utility. The utility generally acts on the reservation and sends the homeowner an Interconnection Application with their requirements identified.
 
The Brightly family contacted their HOA and picked up an HOA application. After asking the supplier for a few details, the application was filled out and submitted along with the requested fee. The application was approved and the Brightly’s were on their way to a clean and renewable source of energy.
 
Although your experience may not be exactly like the Brightly’s, there are certain steps that your contractor can do to facilitate the process. In addition to ordering the materials and scheduling the installation, the supplier usually has two related tasks:
 

  1. Prepare a set of drawings detailing the system installation for submittal to the local city for a building permit. The drawings and the application, along with the fee were submitted. The city building inspector required specifications of the PV modules, inverter, safety disconnect and mounting details. This was simple compared to some jurisdictions and earlier practices when photovoltaic systems were new technology.  Depending on system size and the experience of the building inspector with PV systems, the permit process can range from simple to complex. As an example, the Solar ABCs-developed standardized permit application intended to be adopted by cities and counties is linked here for reference < http://www.solarabcs.org/about/publications/reports/expedited-permit/forms/index.html>.  Most counties and larger Arizona cities have blank permit applications available online, but the forms do not detail all of the submittal requirements. Experienced PV installers have expertise in this area. The permits require identification of the licensed installer and are usually applied for by the system supplier. The building permit generally requires about a 2% fee; it is recommended to call first and get an estimate.  Fees are based on the contract price. The permit is generally required to be posted on the building where inspectors can easily find it.
  2. The supplier submits the required drawings and information on the utility’s Interconnection Application form for approval of the PV system. Documents are generally signed by both the homeowner and the supplier. Requirements vary by utility, so refer to the website of the utility serving the home.

After both the permit and the Interconnection Application are approved, the system can be installed.
 
Installation generally requires 2-3 days depending on crew and system size.
 
After the system is installed, both the HOA and Building Inspector are notified of completion and the system is inspected. The Building Inspector will inspect the installation (but cannot operate the system due to the utility policy detailed in the Interconnect Agreement) and if all is good, will issue a ‘Green Tag’ and close the permit. The installer must correct any problems that arise.
 
The utility is then notified of the passed building permit inspection (they may want a faxed copy of the inspection tag) and will schedule the utility inspection. If all is in order (the utility is particularly interested in the grounding, cable sizes, required labels of parts, usually detailed in their Interconnect Agreement), the utility will turn on the inverter, observe proper operation, make a disconnection test, and then leave the system operating. Again, if there are any problems the installer is responsible for correcting them.
 
After the inspection, the utility generally requires an Installation Certification Form (name varies) along with copies of invoices and a statement of payments showing that the homeowners have paid for their portion of the system. Some utilities offer assignment of incentives to the installer. The utility generally mails the incentive payment check within a few weeks.
 
This might seem like the end of the path, but it is not. With the system now operating, the supplier should schedule a training visit with the homeowner and train the homeowner on system operation.
 
The homeowner is due a copy of all user manuals (a system manual is often prepared that contains copies of all documentation). Arizona law (see http://www.azsolarcenter.com/economics/guidelines1.html) requires that the homeowner be furnished a written statement of certification and a statement of performance. This must include what general performance the purchaser can expect from the system under typical conditions in addition to a statement of warranty.
 
There is really no end of the path, but just like the Brightly’s, yours can begin here. Your system should operate for over 25 years with minimal attention and continue to provide benefits that the whole family can share.
 
A quote from a Scientific American article sums it up:
 
“But the upside is that homeowners with photovoltaic panels on their rooftops can rest assured that as long as the sun shines, they will have power to spare without generating emissions of carbon dioxide and other noxious pollutants.”

About

  • Welcome to the Arizona Solar Center

     This is your source for solar and renewable energy information in Arizona. Explore various technologies, including photovoltaics, solar water heating, solar architecture, solar cooking and wind power. Keep up to date on the latest industry news. Follow relevant lectures, expositions and tours. Whether you are a homeowner looking to become more energy efficient, a student learning the science behind the technologies or an industry professional, you will find valuable information here.
  • About The Arizona Solar Center

    About The Arizona Solar Center Arizona Solar Center Mission- The mission of the Arizona Solar Center is to enhance the utilization of renewable energy, educate Arizona's residents on solar technology developments, support commerce and industry in the development of solar and other sustainable technologies and coordinate these efforts throughout the state of Arizona. About the Arizona Solar Center- The Arizona Solar Center (AzSC) provides a broad-based understanding of solar energy, especially as it pertains to Arizona. Registered Read More
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