All batteriesBattery
Marstek Venus E 3.0
Far more storage per pound than anything else here — over 5 kWh in one box, enough to ride out a whole evening peak even in a larger home. Bought direct from Marstek rather than Amazon, so the buy route differs, but the economics are the strongest on the list.
£849one-off · no subscription
Paired with E.ON Next Smart Saver
£295 saved / yrPayback 2.9 yrs
Estimate on average household use. Adjust it on the home page calculator.
Why it fits a rental
- Plugs into a normal 3-pin socket — no electrician, no landlord sign-off.
- Charges itself when power is cheapest, then runs your home through the pricey peak.
- It's yours to unplug and take with you when you move — never wired in.
Specs
- Usable
- 5.12 kWh
- Expandable to
- 15.4 kWh
- Output
- 800 W (2,500 W peak)
- Grid-charge
- Yes
- Chemistry
- LFP
- Warranty
- 10 yr
- Install
- Plug & play
In the box
- Venus E 3.0 unit
- 3-pin power lead
- App access
- Quick-start guide
Before you buy
Plug-in grid-charging batteries are a new category in the UK. Tell your home insurer, check the unit's current UK certification, and if you rent, confirm it with your landlord. Depending on your setup you may need to notify your network operator (DNO). Savings shown are estimates, not your actual bill.
£849 · saves £295/yr
Reserve this bundle