FAQ

Solar

• How much does a typical solar panel weigh?

  Typical systems weigh 3 ½ to 4 pounds per square foot. Most structures built since 1930 can easily support the weight.
• What does PV stand for?

  It stands for photovoltaic.
• Is a module the same as a panel?

  Technically speaking in the solar electric realm, a module is a complete, environmentally-protected unit. A panel is a collection of modules that are mechanically fastened together. For solar thermal, the individual component is called a collector.
• What is a solar panel made of?

  Silicon and rare metals such as gallium, indium, and selenium. The frames are made of extruded aluminum. The glazing is tempered low iron glass.
• Are estimates free?

  Estimates are free for grid-tie solar electric and solar thermal systems. There is a nominal charge for estimates for landscape lighting, radiant floor heating, and off-grid solar systems. Typically 50% of the fee is applied toward the final purchase.
• What is the payback period?

  The payback period depends on the cost of electricity and therefore depends on the utility. Typical simple payback is 10-12 years.
• How much will a solar hot water system save me on my gas/electric bill?

  A solar hot water system will save $30-35/month for the typical family.
• How have systems improved since the last solar boom of the seventies?

  Contemporary systems are better engineered and have more safety features. In addition, the equipment has longer warranties.
• Why isn't AC an option with off-grid solar?

  It is an option—however, many people seem to think otherwise. Call (520) 341-2286 if you have specific concerns about your off-grid site.
• Why can't you size a system based on the square footage of the home?

  Each family has a different utility use profile; in addition, each home has different types and ages of equipment. The same home will indeed have about the same capability in terms of the total system size, but one home may have used energy-efficient lighting, with a high SEER air conditioner, and not have residents home during the day.
• Why is shading an issue?

  Even 10% shading can significantly reduce the output of a module. With shading, the output is less and the payment is extended. In addition, some utilities evaluate shading and reduce the incentive accordingly.
• How do the tax credits work?

  They are applied to the final tax bill, so if you owe $5,000 in taxes with a $1,000 tax credit, you only owe $4,000. If your withholding exceeds tax liability, the refund increases by the tax credit amount. The Arizona tax credit is 25% of the system cost with a max credit of $1,000. The federal credit is 30% of the net system cost. Net system cost is the contract amount less any utility incentive.
• What can I expect from my pool system?

  Based on the size of the solar pool heating system, you can expect your pool to be 10-12 degrees above the average ambient temperature. For example, if the daytime highs have been about 85 degrees and the nighttime lows about 65 degrees, the pool should be about 85-87 degrees.