Battery Inverter Sizing For Sump Pump

1. List critical loads and hours → daily kWh (W×h÷1000). 2. Choose backup days → usable kWh = daily × days; adjust for DoD & efficiency. 3. Inverter: cover biggest continuous load + 2–3× surge. 4. Costs: ~$350–$600/kWh batteries; $900–$2,500 hybrid inverter; BOS $500–$2,000. 5. DC vs AC coupling; warranty cycles; ambient temp limits. 6. TOU arbitrage + solar self‑consumption can offset costs.