How long can the Tesla Powerwall 3 run a Well pump (1 hp)?
3.2 days
Formula: (13.5kWh × 0.85 inverter efficiency) ÷ 3.6 kWh/day = 3.2 days. At continuous 1500 W draw (no duty cycle), about 7.7 hours.
Appliance
Well pump (1 hp) · 1500 W / 4500 W surge · 240V
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.
3.2 days
Formula: (13500 Wh × 0.85) ÷ 3.6 kWh/day = 3.2 days. Continuous draw ≈ 7.7 hours at full load.
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