You need about 2,667 Wh — and 12 units fit. The smallest sufficient is the Bluetti Apex 300; we never push more capacity than your load can use. Surge to clear: 2,350 W.
The math
Running watts (everything on at once) = 800 W
Surge watts (worst single startup + the rest running) = 2,350 W
Average draw (cyclic loads counted by their duty cycle) = 400 W
Watt-hours = 400 W × 6.0 h ÷ 90% usable reserve = 2,667 Wh
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Bluetti Apex 300smallest that fits
2,765 Wh3,840 W cont · 7,680 W surgeexpandable~6.2 h on this load$$$
A near-3 kWh home-backup system with a 3,840 W continuous inverter and 7,680 W surge — built for a well pump or central AC start, expandable well into whole-home territory.
LiFePO4 · Up to 4,000 W solar input; expandable to 19.4 kWh with B300K batteries (58 kWh with multiple units)
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⚡ Duty cycle matters here. The blower cycles with the thermostat; the gas does the heating, the battery just runs the fan. We size watt-hours on the duty-weighted average (400 W), not the peak — so we don't oversell you capacity.
Can a specific unit run a gas furnace blower (1/2 hp)?
31 of the units we track deliver enough watts to run a gas furnace blower (1/2 hp). Check a specific one for the runtime and the full verdict:
What size power station do I need to run a gas furnace blower (1/2 hp)?
A gas furnace blower (1/2 hp) draws about 800 W running, with a startup surge near 2,350 W. So you want a unit with at least 800 W continuous output and 2,350 W+ surge. For 6.0 h of runtime that's roughly 2,667 Wh of capacity — the Bluetti Apex 300 is the smallest unit that clears all of it.
How many watts does a gas furnace blower (1/2 hp) use?
About 800 W while running, spiking to roughly 2,350 W on startup. It only draws power about 50% of the time, so over an outage its energy use is well below 800 W × the hours — which is why a modest battery lasts longer than you'd expect. The blower cycles with the thermostat; the gas does the heating, the battery just runs the fan.
Sources: Gas Furnace Blower (1/2 HP) wattage — Standard appliance-wattage / generator-sizing charts (representative values; verify your nameplate); station specs — manufacturer published specifications (compiled 2026-08-10; 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.