Scenarios › Power station for a window air conditioner
What size power station runs a window AC?
An 8,000 BTU window unit pulls about 715 W running with a ~1,250 W compressor surge. The compressor cycles, so capacity stretches further than you’d think. Here is the size to keep one room cool for an evening — and the step-up for a bigger unit or all night.
2,778 Whcapacity needed
715 Wrunning watts
1,250 Wsurge to clear
5.0 hruntime horizon
This load: Window AC (8,000 BTU). Want to tweak it? Open the full sizing tool and adjust the appliances and hours.
What size you need
You need about 2,778 Wh — and 7 units fit. The smallest sufficient is the Jackery Explorer 3000 Pro; we never push more capacity than your load can use. Surge to clear: 1,250 W.
The math
Running watts (everything on at once) = 715 W
Surge watts (worst single startup + the rest running) = 1,250 W
Average draw (cyclic loads counted by their duty cycle) = 500 W
Watt-hours = 500 W × 5.0 h ÷ 90% usable reserve = 2,778 Wh
1
Jackery Explorer 3000 Prosmallest that fits
3,024 Wh 3,000 W cont · 6,000 W surge ~5.4 h on this load $$$
Three kilowatt-hours for multi-day outages and heavier loads, on wheels.
LiFePO4 · ~2.4 h AC; up to 1200 W solar · 64 lb
2
Goal Zero Yeti 3000X
3,032 Wh 2,000 W cont · 3,500 W surge expandable ~5.5 h on this load $$$
Three kWh on wheels for multi-day essentials backup.
NMC · AC/solar; integrates with home kit · 70 lb
3
Bluetti AC300 + B300
3,072 Wh 3,000 W cont · 6,000 W surge expandable ~5.5 h on this load $$$
A modular 3 kW system with a sub-20 ms UPS switch — toward whole-home with a transfer switch.
LiFePO4 · Modular; expandable to 12.3 kWh, 24/7 UPS · 116 lb
4
EcoFlow DELTA Pro
3,600 Wh 3,600 W cont · 7,200 W surge expandable ~6.5 h on this load $$$
The whole-home contender on wheels — 3,600 W, expandable to 25 kWh, panel-ready with a transfer switch.
LiFePO4 · AC + EV charging; expandable to 25 kWh · 99 lb
5
Anker SOLIX F3800
3,840 Wh 6,000 W cont · 9,000 W surge expandable ~6.9 h on this load $$$
A 6,000 W, 240 V system for whole-home backup including a well pump and electric range, expandable to ~27 kWh.
LiFePO4 · 120/240 V; expandable to 26.9 kWh · 132 lb
6
Goal Zero Yeti PRO 4000
3,993 Wh 3,600 W cont · 7,200 W surge expandable ~7.2 h on this load $$$
Goal Zero’s LiFePO4 flagship — 4 kWh, 3,600 W, whole-home with the transfer switch and tanks.
LiFePO4 · Fast AC; expandable to ~27 kWh · 104 lb
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Disclosure.
The load, appliance by appliance
⚡ Informational only — a computed sizing estimate from published appliance-wattage charts and manufacturer station specs. It is not an electrical guarantee. For hardwired or whole-home backup, transfer switches, or any permanent install, consult a licensed electrician. Appliance wattages are representative chart values and vary by model; check your nameplates. Duty cycle (how much of the time a load actually draws) is how we keep the watt-hour estimate from overselling capacity.
Common questions
What size power station runs a window AC?
For Window AC (8,000 BTU) over 5.0 h, you need about 2,778 Wh of capacity, 715 W continuous output, and at least 1,250 W of surge. The smallest unit that clears all three is the Jackery Explorer 3000 Pro; a step-up like the EcoFlow DELTA Pro 3 adds headroom for longer outages.
How many watt-hours does this load need?
About 2,778 Wh for 5.0 h — we take the duty-weighted average draw (500 W, since cyclic loads like fridges and pumps don't run constantly), multiply by the hours, and divide by a usable-capacity reserve. Running watts are 715 W; surge is 1,250 W.
Other scenarios
Sources: appliance wattages — standard appliance/generator sizing charts; station specs — manufacturer published specifications (compiled 2026-06-15; approximate). Informational only — a computed sizing estimate from published appliance-wattage charts and manufacturer station specs. It is not an electrical guarantee. For hardwired or whole-home backup, transfer switches, or any permanent install, consult a licensed electrician.