Considering Installing a Solar Battery System

Like most houses with solar, our house is capable of generating a lot of power, and it's basically useless [1] in a disaster. If the grid is down, the panels shut down automatically. This is a lot of value lost, since in a long-term disaster, electricity would be incredibly valuable ( air cleaning, gas boiler or a tiny bit of resistive heat, sump pump, cooking, refrigeration, tools). When we installed a second round of solar in 2024 we considered either a battery backup or "best effort when the sun is shining" power. They priced out at many thousands of dollars and we decided it wasn't worth it, but recently three things have changed my mind: Massachusetts has the ConnectedSolutions program, where you can get paid to send battery power to the grid during times of very high demand. With 10 kWh of storage that I'm ok draining fully this would be about $1k/y. [2] I don't care about reserving capacity because I'm trying to reduce risk from serious disasters lasting weeks or more, and…