Heating circulation pump: how much battery you need
Heating circulation pump draws about 45 W (25–90 W range), runs 80% of the time and uses 864 Wh per day. Start-up surge: 90 W.
Modern ECM pumps (Grundfos Alpha, Wilo Yonos) draw 5–45 W; old three-speed pumps 60–90 W. Replacing the pump is often the cheapest 'battery upgrade'.
Battery needed
| Hours | Wh | Battery (Wh) | Inverter (W) |
|---|---|---|---|
| For 8 hours | 288 | 437 | 50 / 90 |
| For 24 hours | 864 | 1310 | 50 / 90 |
| For 72 hours | 2592 | 3928 | 50 / 90 |
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Stations that fit (24 h)
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FAQ
How many watts does a Heating circulation pump use?
Typically 45 W while running, with a range of 25–90 W depending on model and age. Start-up surge can reach 90 W.
How long will a 1000 Wh power station run a Heating circulation pump?
About 18.3 hours on the clock, allowing for the 80% duty cycle, inverter losses and a 20% reserve.
What size power station do I need for a Heating circulation pump overnight (8 h)?
About 437 Wh of battery and an inverter rated at least 50 W continuous with 90 W surge.
Can I run a Heating circulation pump on solar during an outage?
You need roughly 576 W of panels in winter to replace a day's use (864 Wh), charging through a station with a big enough MPPT input.
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. source