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 …
Only while there’s a surplus. Our net metering arrangement effectively forfeits any surplus at the end of the year. It obviously can vary by region and how much you’d get from surplus vs specifics of the net metering policy, but I think getting paid for surplus is simpler and easier to plan around.
Net metering is great, much better than being paid for the surplus.
With net metering the grid is basically an free, infinite, 100% effective battery.
Only while there’s a surplus. Our net metering arrangement effectively forfeits any surplus at the end of the year. It obviously can vary by region and how much you’d get from surplus vs specifics of the net metering policy, but I think getting paid for surplus is simpler and easier to plan around.