How long can the Goal Zero Yeti Pro 4000 run a Space heater?
4.5 hours
Formula: (4kWh × 0.85 inverter efficiency) ÷ 18 kWh/day = 4.5 hours. At continuous 1500 W draw (no duty cycle), about 2.3 hours.
Appliance
Space heater · 1500 W / 1500 W surge
Battery (base)
4kWh · 3.6kW / 7.2kW surge
Runtime Quick-Check
Runtime Quick-Check
Pick a battery and an appliance — see days of runtime after the 0.85 inverter derate.
4.5 hours
Formula: (3993 Wh × 0.85) ÷ 18 kWh/day = 4.5 hours. Continuous draw ≈ 2.3 hours at full load.
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