How long can the Anker SOLIX F3800 run a Space heater?
4.4 hours
Formula: (3.8kWh × 0.85 inverter efficiency) ÷ 18 kWh/day = 4.4 hours. At continuous 1500 W draw (no duty cycle), about 2.2 hours.
What if you add a battery? The + Home Backup Kit config jumps to 7.7kWh — roughly 8.7 hours on a Space heater.
Appliance
Space heater · 1500 W / 1500 W surge
Battery (base)
3.8kWh · 6kW / 9kW surge
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Runtime Quick-Check
Runtime Quick-Check
Pick a battery and an appliance — see days of runtime after the 0.85 inverter derate.
4.4 hours
Formula: (3840 Wh × 0.85) ÷ 18 kWh/day = 4.4 hours. Continuous draw ≈ 2.2 hours at full load.
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