Claudia and Bill Coleman, Los Altos homeowners, added solar and battery system to their home last year. They're among a growing number of homeowners looking to supplement solar systems with battery storage. Pictured are solar panels on the roof of their house on Nov. 17, 2016. (Dai Sugano/Bay Area News Group/TNS)

LOS ALTOS, Calif. — Bill Coleman needed to replace the roof on his home. The tech entrepreneur, who lives in this Silicon Valley city, decided to package new roof tiles with a solar power system and a battery unit to store electrical power.

The solar panels have dropped his electric bills to nearly nothing, and the rechargeable battery pack from Sunverge has kept the power on at his house during blackouts. It’s quiet and, so far, hassle-free, he said. The extra expense was worth the peace of mind.

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