How long can the EcoFlow DELTA Pro Ultra run a Router + modem?
10.9 dayswell beyond what you asked for
Formula: (6.1kWh × 0.85 inverter efficiency) ÷ 0.48 kWh/day = 10.9 days. At continuous 20 W draw (no duty cycle), about 10.9 days.
What if you add a battery? The + Extra Battery config jumps to 12.3kWh — roughly 21.8 days on a Router + modem.
Appliance
Router + modem · 20 W / 20 W surge
Battery (base)
6.1kWh · 7.2kW / 10.8kW 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.
10.9 days
Formula: (6144 Wh × 0.85) ÷ 0.48 kWh/day = 10.9 days. Continuous draw ≈ 10.9 days at full load.
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