A sump pump can have a significant motor startup surge, so sizing requires more than battery watt-hours.
Use the pump nameplate or manufacturer documentation. The inverter needs enough continuous output and enough surge capability for motor startup.
Battery runtime depends heavily on pump cycling. During heavy water inflow the pump may run more often and use substantially more energy.
Enter battery capacity and average device load. This planning estimate uses 85% usable efficiency.
Actual runtime varies with conversion losses, cycling loads, temperature and battery condition.
Continue with the Power Guides & Resources hub for related runtime, appliance-sizing and solar-planning articles.
Use your estimate above to compare current portable-power options. Start with the closest capacity or solar setup for your needs:
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