myenergi
Libbi 5
UK-made 5kWh battery designed to integrate tightly with solar and Zappi.
From £3,900 installed
How it scores
Scores based on published manufacturer specifications and weighted criteria — not lab testing. Methodology.
Specifications
- Weight kg
- 40
- Usable kWh
- 5
- Dimensions mm
- 595x195x597
- Warranty years
- 5
- Ac or dc coupled
- AC
- Inverter built in
- Yes
- Round trip eff %
- 92
- Cycle count warranty
- 4000
- Depth of discharge %
- 100
What I noticed
myenergi is the Lincolnshire company behind the Zappi EV charger, and the Libbi is their entry into home battery storage. It is an AC-coupled system with an integrated inverter, which makes it straightforward to retrofit onto existing solar installations regardless of what inverter you already have. The 5kWh Libbi 5 is the base unit; a second battery module can be added to reach 10kWh.
The key selling point is the myenergi ecosystem. If you already have a Zappi charger and an eddi hot water diverter, the Libbi slots into the same app and control system, creating a genuinely joined-up home energy setup where solar surplus is prioritised intelligently across car charging, hot water, and battery storage. That kind of integrated control is rare and genuinely useful.
Who it suits
Households already in the myenergi ecosystem — particularly those with a Zappi charger — who want to add battery storage without disrupting an existing solar installation. The AC coupling means installation is simpler and the Libbi can retrofit onto virtually any solar setup. The 5kWh capacity is on the smaller side, but adequate for households whose main goal is morning self-consumption rather than full energy independence.
What I'd watch for
The 5-year warranty is the shortest in this comparison — half the duration of most rivals. myenergi says extended warranty options are available but you should factor the cost into your comparison. The 92% round-trip efficiency is lower than DC-coupled competitors (Fox ESS is 95.5%, GivEnergy 97%) because AC coupling introduces an extra conversion step. The 5kWh capacity may feel limiting after a year or two — confirm whether your roof and solar system will reliably fill a 5kWh battery before choosing this over a 10kWh competitor.