Gas furnace blower 3/4 HP: how much battery you need1
Gas furnace blower 3/4 HP draws about 750 W (750 W range), runs 50% of the time and uses 9000 Wh per day. Start-up surge: 2000 W.
Estimate from motor power (about 560 W at the shaft) for large furnaces.
Battery needed
| Hours | Wh | Battery (Wh) | Inverter (W) |
|---|---|---|---|
| For 8 hours | 3000 | 4546 | 826 / 2000 |
| For 24 hours | 9000 | 13637 | 826 / 2000 |
| For 72 hours | 27000 | 40910 | 826 / 2000 |
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Stations that fit (24 h)
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FAQ
How many watts does a Gas furnace blower 3/4 HP use?
Typically 750 W while running, with a range of 750 W depending on model and age. Start-up surge can reach 2000 W.
How long will a 1000 Wh power station run a Gas furnace blower 3/4 HP?
About 1.8 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 3/4 HP overnight (8 h)?
About 4546 Wh of battery and an inverter rated at least 826 W continuous with 2000 W surge.
Can I run a Gas furnace blower 3/4 HP on solar during an outage?
You need roughly 6000 W of panels in winter to replace a day's use (9000 Wh), charging through a station with a big enough MPPT input.
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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.