Solar Energy 101

Solar energy is by far the most abundant source of energy available to us, with enough energy falling from the sky each day to power our country's electrical needs many times over. Why not take advantage of this incredible energy source by installing a solar energy system? There are two ways in which you can harvest the energy from the sun: Photovoltaic systems and Solar Thermal systems.

Photovoltaic systems or, PV systems, utilize the sun's visible light spectrum to create electricity. Photons from the sun's rays knock electrons off of molecules inside the cells. As the sun's intensity increases, the stream of electrons grows, creating direct current (DC) power. In a typical situation, that DC power would then be converted into alternating current (AC) power for utilization in a home or business. More information about different PV systems can be found in Our Systems Page.

Solar thermal systems utilize the infrared spectrum of the sun's rays to heat water or a heat transfer fluid. Solar thermal systems are generally utilized to heat domestic water supplies, ie: showering, laundry and dishwashing. They can also be used for space heating applications like radiant floor heating and forced air heating systems. There are many different types of solar hot water systems. You can find more information on the systems we offer on Our Systems Page.

What do I need to know?

It is essential to trust the company with which you are working. The Southern Arizona Solar Standards Board (SASSB) was formed to help you connect with reputable installers.

A good installer will have a strong education and knowledge in the realm of solar. Establish good communication with your installer
throughout the whole process. Make sure that they can answer all of your questions. If they can’t answer your questions or exhibit questionable behavior, it may be time to move to a different installer.

• What are current rebates? Do you have to pay taxes on those rebates?


• Does your roof see enough sunlight? While climate is not really a concern in Arizona, in order for a PV system to function properly it needs clear access to the sun’s rays for most of the day.


• How long will the system last? Who provides the warranty on it? The system should last 25 years, at the least. PV performance degrades by less than 1% each year. It is important to make sure the system is installed correctly to ensure long term performance. Make sure you know all of the warranties and who you need to go to if something doesn’t function properly.


• What maintenance do PV modules require? PV systems are fairly easy to maintain. The panels may collect dust and debris over time but simple washing them off with a hose can clean them. Make sure not to spray cold water onto hot panels though because that may crack them. Ask your installer if any other precautions or maintenance is required for your specific system.


• What maintenance does my solar hot water system require? Different types of solar hot water systems have different maintenance requirements.  Please ask your installer for an explanation of maintenance required.

Here are the general steps in the process of buying your very own solar system.