myenergi libbi (5 kWh modules, 3.68 kW or 5 kW inverter)
libbi can use different inverter ratings and several battery modules. The usable figure quoted here is per module, so the module count belongs on every comparison.
Research from manufacturer documents, not a hands-on test. Values and missing details are kept separate below.
- libbi battery module(s)
- libbi inverter
- Household AC
What matters on your quote
Confirm whether the installation is AC- or DC-coupled and which inverter is included. Compare the usable system figure on the quote rather than the family’s largest nominal headline.
- The datasheet’s unlimited cycle-life wording is expressly subject to warranty criteria.
At a glance
| Usable capacity | 4.6 kWh per 5 kWh battery module (1 to 4 modules) |
|---|---|
| Continuous / rated power (original units and basis) | 3.68 kW or 5 kW nominal AC output, depending on the inverter |
| Warranty (years) | 10 years on the battery and inverter |
| Warranty throughput / cycles | No cycle limit stated (“unlimited”, subject to warranty criteria) |
| Coupling | AC- or DC-coupled |
| Expandable to | Up to 20 kWh (four 5 kWh modules) |
Not in the documents we checked so far: peak power, round-trip efficiency, capacity at end of warranty, backup power, UK list price.
Ask the installer before you sign
- Is the usable capacity on the quote the figure above, or a nominal one?
- Can it charge fast enough to fill in your cheap window? Charging power × hours of the window is the most it can take in.
- Is any equipment needed for backup in a power cut included in the price?
- Does it work alongside your current solar inverter, or replace it?
- Which warranty conditions apply in the UK, and what do you have to do to keep them?
Will it pay back for you?
Opens the calculator with this battery’s usable capacity filled in. Add your own installed price and tariff. If the datasheet does not state a round-trip efficiency, use your installer’s figure.
Sources and quotes (6)
Usable capacity: 4.6 kWh per 5 kWh battery module (1 to 4 modules)
“Usable Capacity 4.6kWh”Source: support.myenergi.com (PDF, page 3), read 26 October 2026
Continuous / rated power (original units and basis): 3.68 kW or 5 kW nominal AC output, depending on the inverter
“Nominal AC Output Power 3680W 5000W”Source: support.myenergi.com (PDF, page 4), read 26 October 2026
Warranty (years): 10 years on the battery and inverter
“libbi comes with a 10-year warranty on the battery and inverter”Source: myenergi.com, read 23 October 2026
Warranty throughput / cycles: No cycle limit stated (“unlimited”, subject to warranty criteria)
“Cycle Life Unlimited*”Source: support.myenergi.com (PDF, page 3), read 26 October 2026
Coupling: AC- or DC-coupled
“libbi works as both an AC and DC coupled battery system with solar PV”Source: myenergi.com, read 23 October 2026
Expandable to: Up to 20 kWh (four 5 kWh modules)
“start with 5kWh of storage and expand up to 20kWh”Source: myenergi.com, read 23 October 2026