Annual returns on investment can range from 5 % to 15 % for residential systems, to 10 % to 40 % for commercial systems. (energysage.com)
And even if customers get the positioning correct, they're still losing out on prime sunlight because most residential systems can't move or adjust to the sun's track across the sky. (sciencedaily.com)
It's set up like a grid - connected residential system but also includes an energy storage system, usually in the form of a high - capacity battery backup. (solar-estimate.org)