Things you should do before purchasing a PV system:
Shop around to compare prices before choosing a PV contractor. Compare system features, warranties, and expected annual electrical output.
Get two to three estimates from different contractors to compare pricing and PV systems.
Ask each PV contractor for customer references. You can also check each contractor with your local Office of Consumer Affairs.
Be sure your PV contractor provides you with a written contract that includes equipment pricing, installation costs, model numbers, and warranty information. Make sure you know when to expect the delivery and installation of your PV system.
Understand your PV warranty and that you know who is responsible for honoring the warranty (the installer, dealer, builder, or manufacturer).
Verify that the PV system you receive matches the equipment listed on your contract.
The PV contractor will assist you in obtaining all building permits and inspections. Your PV system must be inspected and approved by a licensed electrical inspector and utility before it can operate.
If you live in a homeowners' association, verify that you have all required approvals from the Architectural Review Committee as applicable. Your contractor can help you with this process.
Ask your PV contractor to review the maintenance and operation of your new system. Be sure the contractor reviews your PV manual with you prior to the completion of the installation.