There are a number of factors to consider when evaluating the best solar companies to make sure you are getting the most out of your investment, and ideally, a net positive return on that investment.

Equipment

Not all solar panels are created equal. When choosing solar panels, evaluate the efficiency of each company’s solar panels—their power rating, power tolerance, efficiency and temperature coefficient—to understand how much energy those panels can be expected to generate. Compare this to the industry average solar panel efficiency of 16 to 18%.

The most efficient solar panels may not always be the best cost per kW ratio — and the best value may vary based on how many panels you are installing — so you may need to do some calculating.

Manufacturer Quality

Check the solar panel company’s production, equipment durability, warranties and assurances. The industry average manufacturer warranty averages 10 to 25 years. If you live in an area with weather conditions that may stress your solar panel installation, check to make sure the solar panels you purchase are designed to withstand outdoor stress.

Installation

Just like any other professional you hire, review a solar panel company’s certifications, licenses, warranties, reviews and local reputation. The best companies will have knowledgeable, full-time team members who should be able to answer any questions you may have throughout the installation and life of your solar system.

Local Incentives

In addition to state and regional benefits to going solar, a study by the National Renewable Energy Laboratory (NREL) determined that larger companies trend towards costing an average of 10% more than smaller, local solar companies for the same or lesser quality equipment. Shop around to determine if you could save by selecting a local solar company.