Some Installation businesses, like SunPower, contain a system functionality assurance. This guarantees you’ll get a specific degree of energy from the solar panels and is an excellent added defense. Other certifications you must watch out for, none of which might be legally demanded but ensure quality, contain the subsequent: NABCEP https://californiasolarcontractors.news.blog/2025/08/23/california-solar-installation-residential-commercial-solutions/