Gas boiler: how much battery you need
Gas boiler (pump + controls) draws about 120 W (80–180 W range), runs 50% of the time and uses 1440 Wh per day. Start-up surge: 300 W.
The boiler itself burns gas; electricity runs the circulation pump, fan and board. Most need a pure-sine inverter and correct phase/neutral — a cheap modified-sine inverter can trip the flame sensor.
Battery needed
| Hours | Wh | Battery (Wh) | Inverter (W) |
|---|---|---|---|
| For 8 hours | 480 | 728 | 132 / 300 |
| For 24 hours | 1440 | 2182 | 132 / 300 |
| For 72 hours | 4320 | 6546 | 132 / 300 |
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Stations that fit (24 h)
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FAQ
How many watts does a Gas boiler (pump + controls) use?
Typically 120 W while running, with a range of 80–180 W depending on model and age. Start-up surge can reach 300 W.
How long will a 1000 Wh power station run a Gas boiler (pump + controls)?
About 11 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 boiler (pump + controls) overnight (8 h)?
About 728 Wh of battery and an inverter rated at least 132 W continuous with 300 W surge.
Can I run a Gas boiler (pump + controls) on solar during an outage?
You need roughly 960 W of panels in winter to replace a day's use (1440 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