Window AC · EcoFlow DELTA 2 Max
How Long Will an EcoFlow DELTA 2 Max Run a Window AC?
About 3.9 h for a 5,000 BTU window AC (450 W), by our math: 2,048 Wh × 0.85 ÷ 450 W. Across the cases below: 2.6 h to 3.9 h.
| Spec | EcoFlow DELTA 2 Max |
|---|---|
| Battery | 2,048 Wh (maker spec) |
| Usable (× 0.85) | 1,741 Wh |
| Output / surge | 2,400 W / 4,800 W |
| Own draw | not listed |
| Solar input | 1,000 W |
| Price | $1,049 (Oct 24) at EcoFlow |
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Window AC hours on the DELTA 2 Max
| Case | Watts | On the DELTA 2 Max |
|---|---|---|
| 5,000 BTU window AC (Frigidaire) | 450 W | 3.9 h |
| 8,000 BTU window AC (Friedrich) | 661 W | 2.6 h |
Wh × 0.85 ÷ (watts + the station’s own draw, where the maker lists it).
Hours are nonstop; the compressor cycles off once the room is cool, so real hours are longer.
Can the DELTA 2 Max start it?
We plan for a start of about 4× running watts, a figure from a generator maker (Polaris). Inverter ACs start more gently (Berkeley Lab). The DELTA 2 Max has a 4,800 W surge. 5,000 BTU window AC: covers it; 8,000 BTU window AC: covers it.
How much an hour takes
An hour of a 5,000 BTU window AC running nonstop uses about 450 Wh, about 26% of the DELTA 2 Max’s usable 1,741 Wh. At its 1,000 W solar input and our 75% assumption, strong sun puts about 750 Wh an hour back into the battery.
AC manuals commonly say to plug into a wall outlet and not to use an extension cord; check yours first.
Window AC on similar stations
| Station | Capacity | 5,000 BTU window AC | Price |
|---|---|---|---|
| EcoFlow DELTA 3 Max Plus | 2,048 Wh | 3.9 h | $1,199 |
| Anker SOLIX C2000 Gen 2 | 2,048 Wh | 3.8 h | $899.99 (Oct 24) |
| BLUETTI AC200L | 2,048 Wh | 3.8 h | $899 |
| Jackery Explorer 2000 v2 | 2,042 Wh | 3.9 h | $899 (Oct 24) |
Maker prices, Oct 26, 2026, unless dated. Checkout price applies.
More: EcoFlow DELTA 2 Max specs and every runtime · Window AC on every station · calculator for your own devices.
Quick answers
How long will the EcoFlow DELTA 2 Max run a window air conditioner?
About 3.9 h for a 5,000 BTU window AC (450 W), by our math: 2,048 Wh × 0.85 ÷ 450 W.
Can the EcoFlow DELTA 2 Max start a window air conditioner?
We plan for a start of about 4× running watts, a figure from a generator maker. Inverter ACs start more gently. The DELTA 2 Max has a 4,800 W surge. 5,000 BTU window AC: covers it; 8,000 BTU window AC: covers it.
How long does the EcoFlow DELTA 2 Max take to recharge with solar?
About 2.7 hours of strong sun from empty at its 1,000 W solar input, by our 75% assumption; clouds and winter sun add time.
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