Gas furnace blower 1/3 HP: how much battery you need1
Gas furnace blower 1/3 HP draws about 400 W (400 W range), runs 50% of the time and uses 4800 Wh per day. Start-up surge: 1000 W.
Estimate from motor power (about 250 W at the shaft); an ECM blower draws less.
Battery needed
| Hours | Wh | Battery (Wh) | Inverter (W) |
|---|---|---|---|
| For 8 hours | 1600 | 2425 | 441 / 1000 |
| For 24 hours | 4800 | 7273 | 441 / 1000 |
| For 72 hours | 14400 | 21819 | 441 / 1000 |
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Stations that fit (24 h)
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FAQ
How many watts does a Gas furnace blower 1/3 HP use?
Typically 400 W while running, with a range of 400 W depending on model and age. Start-up surge can reach 1000 W.
How long will a 1000 Wh power station run a Gas furnace blower 1/3 HP?
About 3.3 hours on the clock, allowing for the 50% duty cycle, inverter losses and a 20% reserve.
What size power station do I need for a Gas furnace blower 1/3 HP overnight (8 h)?
About 2425 Wh of battery and an inverter rated at least 441 W continuous with 1000 W surge.
Can I run a Gas furnace blower 1/3 HP on solar during an outage?
You need roughly 3200 W of panels in winter to replace a day's use (4800 Wh), charging through a station with a big enough MPPT input.
Other sizes
Other appliances
1 Approximate values: estimated from motor or heater power and typical figures published online, not from a manufacturer chart. Check your appliance label.
Inverter efficiency 88%, usable depth of discharge 90%, reserve 20%. Full method: How we calculate.