Window AC · BLUETTI Apex 300
How Long Will a BLUETTI Apex 300 Run a Window AC?
About 5 h for a 5,000 BTU window AC (450 W), by our math: 2,765 Wh × 0.85 ÷ (450 W + its 20 W own draw). Across the cases below: 3.5 h to 5 h.
| Spec | BLUETTI Apex 300 |
|---|---|
| Battery | 2,765 Wh (maker spec) |
| Usable (× 0.85) | 2,350 Wh |
| Output / surge | 3,840 W / not listed |
| Own draw | 20 W (maker) |
| Solar input | 2,400 W |
| Price | $1,499 at BLUETTI |
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Window AC hours on the Apex 300
| Case | Watts | On the Apex 300 |
|---|---|---|
| 5,000 BTU window AC (Frigidaire) | 450 W | 5 h † |
| 8,000 BTU window AC (Friedrich) | 661 W | 3.5 h † |
Wh × 0.85 ÷ (watts + the station’s own draw, where the maker lists it). † Its output covers the start, but no surge rating is listed.
Hours are nonstop; the compressor cycles off once the room is cool, so real hours are longer.
Can the Apex 300 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 Apex 300 has a 3,840 W output (no surge rating is listed). 5,000 BTU window AC: likely, though no surge rating is listed; check with BLUETTI; 8,000 BTU window AC: likely, though no surge rating is listed; check with BLUETTI.
How much an hour takes
An hour of a 5,000 BTU window AC running nonstop uses about 450 Wh, about 19% of the Apex 300’s usable 2,350 Wh. At its 2,400 W solar input and our 75% assumption, strong sun puts about 1,800 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 |
|---|---|---|---|
| Jackery HomePower 3000 | 3,072 Wh | 5.8 h | $1,349 |
| ALLPOWERS R4000 | 3,456 Wh | 6.5 h | $1,499 |
| BLUETTI Elite 200 V2 | 2,074 Wh | 3.8 h | $899 |
| EcoFlow DELTA 3 Max Plus | 2,048 Wh | 3.9 h | $1,199 |
Maker prices, Oct 26, 2026, unless dated. Checkout price applies.
More: BLUETTI Apex 300 specs and every runtime · Window AC on every station · calculator for your own devices.
Quick answers
How long will the BLUETTI Apex 300 run a window air conditioner?
About 5 h for a 5,000 BTU window AC (450 W), by our math: 2,765 Wh × 0.85 ÷ (450 W + its 20 W own draw).
Can the BLUETTI Apex 300 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 Apex 300 has a 3,840 W output (no surge rating is listed). 5,000 BTU window AC: likely, though no surge rating is listed; check with BLUETTI; 8,000 BTU window AC: likely, though no surge rating is listed; check with BLUETTI.
How long does the BLUETTI Apex 300 take to recharge with solar?
About 1.5 hours of strong sun from empty at its 2,400 W solar input, by our 75% assumption; clouds and winter sun add time.
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