How long can the Bluetti AC500 + B300S run a Router + modem?
5.4 dayswell beyond what you asked for
Formula: (3.1kWh × 0.85 inverter efficiency) ÷ 0.48 kWh/day = 5.4 days. At continuous 20 W draw (no duty cycle), about 5.4 days.
What if you add a battery? The AC500 + 2× B300S config jumps to 6.1kWh — roughly 10.9 days on a Router + modem.
Appliance
Router + modem · 20 W / 20 W surge
Battery (base)
3.1kWh · 5kW / 10kW 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.
5.4 days
Formula: (3072 Wh × 0.85) ÷ 0.48 kWh/day = 5.4 days. Continuous draw ≈ 5.4 days at full load.
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