1) List loads + hours → daily kWh.
2) Pick backup days.
3) Inverter ≥ largest continuous load; 2–3× surge for pumps.
4) Usable ≈ 85–90% of nameplate.
5) TOU arbitrage can offset costs.
Battery Backup
Ac Coupling Vs Dc Coupling Tradeoffs
Top picks: Start at 5–7 kWh for essentials; add more for TOU savings. Hybrid inverter with 2–3× surge headroom.
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