Water softener: how much battery you need1
Water softener (control valve) draws about 10 W (10 W range), runs 100% of the time and uses 240 Wh per day. Start-up surge: 10 W.
Estimate: the timer and valve draw a few watts; regeneration can wait until power returns.
Battery needed
| Hours | Wh | Battery (Wh) | Inverter (W) |
|---|---|---|---|
| For 8 hours | 80 | 122 | 11 / 10 |
| For 24 hours | 240 | 364 | 11 / 10 |
| For 72 hours | 720 | 1091 | 11 / 10 |
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Stations that fit (24 h)
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FAQ
How many watts does a Water softener (control valve) use?
Typically 10 W while running, with a range of 10 W depending on model and age. Start-up surge can reach 10 W.
How long will a 1000 Wh power station run a Water softener (control valve)?
About 66 hours on the clock, allowing for the 100% duty cycle, inverter losses and a 20% reserve.
What size power station do I need for a Water softener (control valve) overnight (8 h)?
About 122 Wh of battery and an inverter rated at least 11 W continuous with 10 W surge.
Can I run a Water softener (control valve) on solar during an outage?
You need roughly 160 W of panels in winter to replace a day's use (240 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.