Seems odd that the installer is putting in sealed batteries. Are they AGMs? If so, they don't need venting and are not a flame hazard . . . but usually don't last near as long as conventional flooded-lead-acid batteries when used in deep-cycle battery banks. Many installers are pushing them because they get good deals and they ship cheaper then conventional lead-acid batteries. Also, NY if paying incentives requires a minimum of 5 year warrantees on everything - including the batteries.
Hope you don't have the same installers I had. Not from Burdett, NY, are they?
Maybe I'm' being too hard on them. My job was their first - I think. Also they'd never seen a solar grid-tie with battery-backup before. I HAD to hire a state-certified installer to qualify for the incentives. So I hired the "Upstate Energy" guys and worked with them - as a sort of sub-contractor on my own property. I fixed some of their goofs, did the excavating, etc.
In regard to gray days - we get many. We usually get 3 months a year when we make little to no power. But there are other months when we make more then twice what we use. Every year we've made more then we used.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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