Home backup battery
2kWh home backup battery
Coming soon
Stays in one place indoors. Covers the evening essentials, or a fridge-freezer for well over a day.
- Usable
- ~2,000 Wh
- At the sockets
- ~1,700 Wh
- Charges from
- Wall socket
Home backup batteries · coming soon
Home backup batteries, spec by spec
A home backup battery is a standalone unit that lives indoors. It charges from a wall socket and powers whatever you plug into it, through the evening or a power cut.
These batteries can't be used with a plug-in solar kit They don't store a kit's power and never connect to one. A plug-in kit must never be used with a battery.
The battery matrix
Tap a heading to sort. Swipe the table sideways on a phone.
| Usable capacity | |||||
|---|---|---|---|---|---|
| 2kWh class | 1,700 | 42 | 19 | 28 | 170 |
| 3kWh class | 2,550 | 63 | 29 | 42 | 255 |
| 5kWh class | 4,250 | 106 | 49 | 70 | 425 |
Worked out from usable capacity alone: 85% reaching the sockets and typical figures, rounded down. Evening set: TV, two lamps and the router, about 86W. The 2kWh battery is the first size we plan to list.
How to read usable vs nominal capacity
Nominal capacity is everything the cells hold. Usable capacity is what the battery lets you draw before it stops to protect itself. Usable is always the smaller figure, and it's the one to compare.
Then some energy is lost turning battery power into mains power for your sockets. We plan with 85% of usable reaching the sockets until a model's tested figure is in.
| Figure | What it means | For a 2kWh battery |
|---|---|---|
| Nominal | Everything the cells hold | A little over 2,000Wh |
| Usable | What you can draw | About 2,000Wh |
| At the sockets | What your appliances get | About 1,700Wh |
How each one charges: mains, off-peak or its own panel
- Mains. Plug it into a wall socket, like any appliance.
- Off-peak. With a charge timer and a time-of-use tariff, it fills up in the cheaper hours, often overnight.
- Its own panel. Some models take a folding panel of their own. The listing says if yours does.
None of them are wired into your fuse box. You plug appliances into the battery, and it powers those.
Why none of these connect to a plug-in kit
Plug-in solar kits follow strict rules so they can plug safely into a home socket. One of those rules: a plug-in kit must never be used with a battery.
So we keep the two apart. Our batteries never store power from a plug-in kit, and we don't sell anything that links them.
Want solar panels with battery storage? That's a fitted system, designed and installed by a qualified solar installer.
On the list
The first size we plan to stock.
Be told when home batteries go on sale
We're choosing the model now. Join the list and we'll email you when the 2kWh home backup battery is ready to order.
Will a home backup battery run my whole house?
No. It powers what you plug into it, so choose the essentials: the fridge-freezer, lights, Wi-Fi and phones.
Does it need an electrician?
No. It's a standalone appliance that plugs into a wall socket, and your appliances plug into it. It isn't wired into your home's circuits.
Can I keep it in the garage?
Not in winter if the garage freezes. Lithium batteries usually can't charge below 0°C. A dry spot indoors is better.
Is it the same as a battery for rooftop solar?
No. A rooftop system's battery is wired in by an installer. Ours are standalone and plug into a socket.