I have a modest set of solar panels on an entirely ordinary house in suburban London. On average they generate about 3,800kWh per year. We also use about 3,800kWh of electricity each year. Obviously, we can't use all the power produced over summer and we need to buy power in winter. So here's my question: How big a battery would we need in order to be completely self-sufficient? Background …
It’s been a while, but in general based on having too much solar tilted +15 from latitude to maximize winter production, and relying on 14 sun hours/week as a minimum, even if 20 -22 would be expected average. While solar has fixed bs/costs, an extra 300w is fairly cheap, and adding to that often less expensive than more btu (or kwh) storage, or more insulation. Monetizing summer surpluses into crypto (back then) or gpu dataserver rental, also means never having too much solar. Full ROI on all solar, compared to overdoing it on heat storage.
It’s been a while, but in general based on having too much solar tilted +15 from latitude to maximize winter production, and relying on 14 sun hours/week as a minimum, even if 20 -22 would be expected average. While solar has fixed bs/costs, an extra 300w is fairly cheap, and adding to that often less expensive than more btu (or kwh) storage, or more insulation. Monetizing summer surpluses into crypto (back then) or gpu dataserver rental, also means never having too much solar. Full ROI on all solar, compared to overdoing it on heat storage.