How long can the Tesla Powerwall 3 run a Sump pump?
4 days
Formula: (13.5kWh × 0.85 inverter efficiency) ÷ 2.88 kWh/day = 4 days. At continuous 800 W draw (no duty cycle), about 14.3 hours.
Appliance
Sump pump · 800 W / 2000 W surge
Battery (base)
13.5kWh · 11.5kW / 11.5kW surge
Runtime Quick-Check
Runtime Quick-Check
Pick a battery and an appliance — see days of runtime after the 0.85 inverter derate.
4 days
Formula: (13500 Wh × 0.85) ÷ 2.88 kWh/day = 4 days. Continuous draw ≈ 14.3 hours at full load.
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