How long can the Anker SOLIX F3800 run a Router + modem?
6.8 dayswell beyond what you asked for
Formula: (3.8kWh × 0.85 inverter efficiency) ÷ 0.48 kWh/day = 6.8 days. At continuous 20 W draw (no duty cycle), about 6.8 days.
What if you add a battery? The + Home Backup Kit config jumps to 7.7kWh — roughly 13.6 days on a Router + modem.
Appliance
Router + modem · 20 W / 20 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.
6.8 days
Formula: (3840 Wh × 0.85) ÷ 0.48 kWh/day = 6.8 days. Continuous draw ≈ 6.8 days at full load.
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