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Nook batteries from Octopus

Tim441 · 2026-06-22T14:46:16Z

Octopus have launched Octopus Nook Cube, a compact, shoebox-sized 2kWh battery that simply plugs into a standard socket. Controlled through the Octopus app, extra units will be able to be added to increase storage up to 10.5 kWh. For homeowners, Octopus is also launching Octopus Nook Collosus, a wall-mounted 5 kWh battery, which can be stacked up to 30 kWh for larger homes. Both battery systems are compatible with solar panels and come with a 12-year warranty. available from next year. No idea if you can have these alongside any other batteries?

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Energy Storage

Last Post by EtchedPixels 1 month ago

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sonosppp

(@sonosppp)

Active Member Member

Joined: 7 months ago

Posts: 14

01/07/2026 11:52 am

Both of octopus' new batteries are Fox ESS units re-badged. Their specs are widely available.

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Batpred

(@batpred)

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Joined: 2 years ago

Posts: 1236

08/10/2026 11:42 pm

Posted by: @etchedpixels

↑

According to multiple sources these are FoxESS batteries with an Octopus sticker on them.

just wondering if anyone has got any Nook to confirm what it is exactly and what it works like?
Do they come with a ct clamp?
Are they pre approved by the dno?

8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kW export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; Vaillant Arotherm Pro 7kW; 100Amp head, HA lab on mini PC

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EnergyStorageTech

(@energystoragetech)

New Member Member

Joined: 1 month ago

Posts: 6

09/10/2026 2:24 am

Until Octopus publishes the electrical limits, the key distinction is energy capacity versus usable power.

A 10 kWh stack limited to around 800 W export can still shift cheap-rate energy, but it will not behave like a conventional whole-home backup system. I would want confirmed figures for continuous and peak charge/discharge, EPS or islanding capability, compatibility with existing inverters, and whether the smart controls require an Octopus tariff.

This post was modified 1 month ago by Mars

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Batpred

(@batpred)

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Joined: 2 years ago

Posts: 1236

09/10/2026 5:37 pm

@energystoragetech

Yes, and 800W would be too low for the kettle.. But when DIY is here, it may be an acceptable limitation.

8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kW export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; Vaillant Arotherm Pro 7kW; 100Amp head, HA lab on mini PC

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EtchedPixels

(@etchedpixels)

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Joined: 6 months ago

Posts: 224

09/10/2026 6:09 pm

@batpred If your energy use is low enough that just getting a Fogstar and a suitable 48v inverter isn't more financially sensible I suspect likewise that 800W for most things will be fine. It'll not cover the kettle, microwave, induction hob/oven or any direct water heating but it'll do most stuff.

The so called "plug in ready" kit with wifi CT clamps does spectacularly bad with induction cookers anyway as they tend to switch on/off full power very rapidly and the clamp is permanently way behind reality.

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