There’s no shortage of advice on how to size a home solar and battery system, but most of it assumes a suburban home with city services and outages measured in hours, not days. Rural homes play by different rules, especially during major winter storms. When ice and snow take down lines and your utility prioritizes restoring power to urban neighborhoods, having a home battery isn’t about convenience — it’s about damage control.

There’s no shortage of advice on how to size a home solar system, but most of it assumes a suburban house with city water and a long list of optional loads. Rural homes play by different rules, and when your water comes from a well, keeping the lights on is optional — but keeping the well’s pump running isn’t.

Here’s what it really takes, in solar and battery terms, to keep your home’s water flowing even when its electrons aren’t.