Solar Contractor

Choosing a solar contractor

Much of the labor for installing a PV system can be done by tradesmen or even by skilled homeowners. Roofing and wiring skills are, of course, prerequisites. But manufacturers have worked to make installing systems easier.

Wiring the relatively lightweight (30-pound) panels together and to roof-top junction boxes, for example, is "plug and play." New module mounting systems have specially extruded rails that make module alignment easy by accepting sliding mounting feet and module clamps.

Flashing details for mounting posts have also been improved and are now similar to flashing for vent stacks.

That said, there's no substitute for experience. Arno Harris, a San Diego solar contractor and president of Prevalent Power, Inc., encourages both homeowners and contractors to hire professional solar power specialists to do the job.

"There are a number of complex variables involved in sizing a system, including how much power to replace based on analysis of power bills and billing rates, how much power the system will really put out, and electrical dynamics that occur under load. It's analogous in scope to sizing an HVAC system...not rocket science, but it would be hard to pick it up in just a day or so."

Chris Warfel, a solar engineer in Rhode Island, says if you're going to oversee most of the installation yourself, be prepared to run into some blank stares if you call your electrician for help. He says: "There are people who know solar and people who know electrical systems, but there aren't many who know a lot about both."

Everett Barber, a solar installer for 27 years with Sunsearch, Inc. in Guilford, Connecticut, agrees.
Barber feels that it's wise to consult with a licensed solar installer before you begin installing expensive components, especially when homeowners want a custom system that can do things beyond what the pre-engineered systems offer, such as powering DC appliances directly, solving orientation problems and providing for longer emergency back-up capability.

Companies such as his conduct feasibility studies and will design and install the systems as well. In addition, solar professionals are knowledgeable about state rebates, grants, loans and tax incentives and can help homeowners with the application processes.