How Long Will the EcoFlow River 2 Pro Run a Window AC (5,000 BTU)?
Updated 2026-10-17 · Yes
The numbers
| Battery capacity | 768Wh (LFP) |
|---|---|
| Usable energy | 653Wh (85% via AC outlets) |
| Continuous AC output | 800W |
| Surge rating | 1600W |
| Window AC (5,000 BTU) running watts | 450W |
| Startup watts | 1300W |
| Average draw | 315W |
| Estimated runtime | 2.1 hours |
| Energy per day of typical use | 2.5 kWh |
768Wh × 0.85 = 653Wh usable ÷ 315W average = 2.1 hours
Station specs: source, checked 2026-10-17. See how we calculate runtime.
Adjust the numbers
Check the label on your window AC (5,000 BTU) and enter its real wattage.
Recharging with solar
The EcoFlow River 2 Pro accepts up to 220W of solar input. In real conditions that harvests about 825Wh on a sunny day (5 peak-sun hours), or about 750Wh with one 200W panel.
Solar can’t fully keep up. A window AC (5,000 BTU) uses about 2.5 kWh a day at 8 hours of use, more than the EcoFlow River 2 Pro’s best-case solar harvest. Solar will stretch the runtime but not sustain it.
Tips
- Small window units draw around 450W while the compressor runs. On hot days it rarely switches off, so expect 60–80% duty.
- You’ll still have about 350W of AC capacity left for other devices at the same time, though they’ll share the same battery.
- The EcoFlow River 2 Pro uses LiFePO4 (LFP) cells, rated for thousands of cycles, so running it down daily won’t wear it out quickly.
Other power stations running a window AC (5,000 BTU)
| Power station | Capacity | Output | Runtime | Verdict |
|---|---|---|---|---|
| Jackery Explorer 500 | 518Wh | 500W | 1.4 hours | Startup risk |
| Anker SOLIX C800 Plus | 768Wh | 1200W | 2.1 hours | Yes |
| Bluetti AC70 | 768Wh | 1000W | 2.1 hours | Yes |
| Jackery Explorer 1000 | 1002Wh | 1000W | 2.7 hours | Yes |
| EcoFlow Delta 2 | 1024Wh | 1800W | 2.8 hours | Yes |
| DJI Power 1000 | 1024Wh | 2200W | 2.8 hours | Yes |
| Anker SOLIX C1000 | 1056Wh | 1800W | 2.8 hours | Yes |
| Jackery Explorer 1000 v2 | 1070Wh | 1500W | 2.9 hours | Yes |
FAQ
Will the EcoFlow River 2 Pro run a window AC (5,000 BTU) overnight?
No. At about 315W average it runs out after 2.1 hours. For a full night you need at least 3000Wh of capacity.
How long does the EcoFlow River 2 Pro take to recharge with solar?
With its maximum 220W of solar input it refills in about 4.7 hours of strong sun. With a single 200W panel, expect about 5.1 hours of full sun.