Built for Irish outages · Storm Éowyn left 768,000 homes without power

Power Cut Backup Calculator: What Size Power Station Does Your Home Need?

Tick what you need to keep running — fridge, broadband, the oil boiler, the well pump — and how long the lights might be out. We'll tell you the battery size that actually covers it, in watt-hours and euro, not marketing promises.

Step 1

What do you need to keep running?

Averages already account for how often each appliance actually draws power (a fridge compressor only runs about a third of the time).

Step 2

How long do you want to cover?

Most Irish faults are fixed in under 12 hours. After Storm Éowyn (January 2025), parts of the north-west waited over two weeks. Rural one-line areas should plan for more than a day.

Honest winter figure: Irish storms hit in winter, when a panel sees only ~1.2 equivalent sun-hours a day. This panel adds roughly 210 Wh a day to your battery — a summer outage would give 4–5× that. Runtimes below include this top-up.

— W
Average continuous load
— W
Inverter power needed
— W
Start-up surge to handle
— Wh
Battery energy needed (incl. losses)
Electric showers and immersions are out. They draw 8,500–10,500 W — no portable power station runs them. Boil water on a gas camping stove instead.
Kettle/microwave note: short heavy bursts are fine on 2,000 W+ units but drain the battery fast. A €30 gas camping stove is the smarter partner for any power station.
🔥 Oil/gas boiler: the boiler itself is usually hardwired. Have an electrician fit a plug-and-socket or changeover switch on the boiler circuit — a one-hour job — so you can plug it into the power station safely. Never backfeed a socket.
💧 Well pump: pumps surge to ~3× their running watts on start-up. Check your pump's rating plate — ours assumes a typical 0.75 kW submersible. Larger pumps need the surge figure above re-checked.
❤️ Medical devices: if anyone in the home depends on electrically powered medical equipment, register with your supplier and ESB Networks as a vulnerable customer (priority restoration + outage notice), and keep a dedicated backup for the device alone.
Step 3

What to buy

Size classTypical modelsRuns your loadInverterTypical priceFit

Runtimes assume ~85% usable energy after inverter losses. "Typical models" are the class, not an endorsement of a specific unit — compare current prices before buying.

Your ticks, hours and solar choice live in the link itself — share it with the household or keep it for the next orange warning. Nothing is stored on any server.

Check today's prices on your size class

Power station prices in Ireland swing 20–40% around sales events (and Éowyn-style storms empty the shelves in days — buy before the orange warning, not during it).

All brands deliver to Ireland with EU plugs and EU warranty

Irish power-cut backup FAQs

Power station or petrol generator?

For most Irish homes: power station. Silent, no fumes (safe indoors), no fuel to store, instant switchover for broadband and medical kit. A petrol generator only wins for multi-day outages with heavy loads — and after Éowyn, petrol stations in affected areas had queues and outages too. The strongest rural setup is a mid-size power station plus solar panel input, or station + small generator to recharge it.

Where do I check if my area has a fault?

ESB Networks PowerCheck (powercheck.esbnetworks.ie) shows live faults and restoration estimates for every area in the Republic. Save it on your phone — it works on mobile data when your broadband is down.

Can it run my oil boiler? My heating is oil-fired.

Yes — this is the classic rural Irish use case. The burner, pump and controls only draw 100–200 W; it's the hardwiring that stops you. Once an electrician fits a plug/changeover on the boiler circuit, even a 1 kWh unit runs the heating for a day or more.

What about three-phase or storage heaters?

Out of scope for portable units. If you have night storage heating, plan around keeping one room warm with a stove or oil-filled radiator on the power station (500 W setting, short bursts).

How do I keep it charged?

LFP (LiFePO₄) units — now the standard — hold charge for months and take 3,000+ cycles. Store at 50–80%, top up when a status-orange or red weather warning is issued, and you'll always be ready.

Will a solar panel recharge it during an Irish winter outage?

Slowly, but usefully. Storms hit in winter, when Ireland sees only ~1–1.5 equivalent sun-hours a day, so a 220 W folding panel realistically adds about 0.2 kWh per day — enough to run a router, phones and LED lights indefinitely, though it won't keep up with a fridge on its own. In a multi-day, Éowyn-class outage that trickle is the difference between rationing the battery and riding it out. A summer outage would give you 4–5× as much. Tick the solar option in Step 2 and the runtimes above count it honestly at the winter rate.