Eliot Crook, Founder · Updated · 9 min read
myenergi Libbi Review: UK Price, Specs & Verdict (2026)
The myenergi Libbi is a modular, all-in-one hybrid inverter and battery system from the UK smart-charging brand behind the Zappi EV charger. Hardware alone runs from around £2,150 ex VAT for the smallest 5kWh unit up to around £6,900 ex VAT for a 20kWh system; a professionally fitted system typically lands in the same £4,000-£9,000 band as other batteries on this site once installation is added. Its edge is true modular expansion in 5kWh steps and native integration with Zappi and Eddi.
What is the myenergi Libbi?
The Libbi is an all-in-one wall-mounted unit combining a hybrid inverter and an LFP (lithium iron phosphate) battery in one enclosure. It is modular: it starts at 5kWh (one module, 3.68kW inverter) and expands in 5kWh steps to 10kWh, 15kWh and 20kWh, with a 5kW inverter from the 10kWh configuration up.
It is built by myenergi in Grimsby, UK - the company behind the Zappi EV charger and the Eddi solar diverter. (Source: myenergi.com official product page, fetched 31 Aug 2026.)
myenergi Libbi UK price breakdown (hardware only)
Hardware-only UK trade prices, ex VAT, in 2026. The 5kWh configuration with the 3.68kW inverter runs £2,165-£2,348. The 10kWh configuration with a 3.68kW or 5kW inverter runs £3,206-£3,657. The 20kWh configuration with the 5kW inverter runs £6,859-£6,995.
The 15kWh step sits proportionally between the 10kWh and 20kWh configurations, but no verified retailer price exists for that specific step - major retailers do not independently price it, so we do not estimate one.
These are hardware-only trade prices from UK retailers (Plug In Solar, ITS Technologies, UK EV Installers, Powerland), fetched 31 August 2026. They are DIY/trade prices carrying standard 20% VAT - not what a homeowner pays for a professionally fitted system, as the next section explains.
Fitted price: what installation actually adds
Buying hardware alone is not how most homeowners get a Libbi. myenergi requires installation and commissioning by a trained, approved installer - otherwise the warranty is void.
A professionally installed system (materials plus fitting, via an MCS-registered installer) qualifies for 0% VAT until 31 March 2027, reverting to 5% from 1 April 2027 under HMRC VAT Notice 708/6. MCS certification is not itself a condition of the VAT relief. The 20% VAT on the hardware-only prices above does not apply to a professional install.
We do not state a specific Libbi installed price as fact, because no verified fitted-price source exists for this model specifically. Fitted battery systems on this site generally range £4,000-£9,000 depending on capacity - see our home battery storage cost guide for the full breakdown. The only way to get an accurate Libbi-specific fitted price is a real quote from an approved installer.
Modular expansion: 5kWh to 20kWh explained
Each Libbi module is 5kWh. You can start small - a 5kWh unit with a 3.68kW inverter - and add modules later up to 20kWh without replacing the original unit. That is genuine in-place expansion, unlike systems that require a second standalone battery. (Source: myenergi.com.)
Warranty and chemistry
The Libbi carries a 10-year warranty covering both the battery and the inverter. It uses LFP (lithium iron phosphate) chemistry - the same safer, more stable chemistry used across most modern UK home batteries, including GivEnergy and the Tesla Powerwall 3. (Source: myenergi.com.)
Built for the myenergi ecosystem: Zappi and Eddi
The Libbi is designed to work with myenergi's Zappi EV charger and Eddi solar diverter via the myenergi app, coordinating where surplus solar and battery power goes: home first, then hot water via Eddi, then EV via Zappi. This is the Libbi's clearest differentiator for a household that already has, or is planning, a Zappi charger. (Source: myenergi.com.)
The same caveat applies here as above: the system must be installed and commissioned by an approved installer or the warranty is voided - that covers ecosystem setup too.
Comparison: Libbi vs GivEnergy vs Tesla Powerwall 3
On capacity, the Libbi is modular in 5/10/15/20kWh steps, GivEnergy's All-in-One is fixed per model, and the Tesla Powerwall 3 is a 13.5kWh unit expandable with additional 13.5kWh units. All three use LFP chemistry. The Libbi and Powerwall 3 both carry 10-year warranties; for GivEnergy, see our GivEnergy update page for the current status - the company entered administration on 9 April 2026, so we do not restate its outdated pricing here.
On ecosystem, the Libbi's strength is Zappi/Eddi integration (EV charging and hot water), GivEnergy's is a wide installer base, and the Powerwall 3's is the Tesla app with stronger backup power at higher output. On entry hardware price ex VAT, the Libbi starts around £2,150 for 5kWh; the Powerwall 3 unit alone is around £6,500 - see our Tesla Powerwall 3 price breakdown for the full fitted picture.
Verdict line: the Libbi's strongest case is a household already using or planning a Zappi EV charger; otherwise compare fitted quotes on capacity and installer coverage, not brand alone.
Tariff strategy: pairing the Libbi with an off-peak tariff
Any home battery only pays back if it is paired with a time-of-use tariff - for example Intelligent Octopus Go at around 8p/kWh off-peak versus around 28p/kWh peak on a standard tariff - so it can charge cheap and discharge at peak. See our tariffs hub for the current options, then run real numbers for your own usage in the payback calculator.
Is the myenergi Libbi worth it?
Balanced verdict: genuine modular expansion and the Zappi/Eddi ecosystem are real, verifiable advantages for EV and solar households. Hardware pricing sits mid-pack against GivEnergy and well under the Powerwall 3's entry unit price.
The honest caveat: no independently verified fitted price exists yet for this specific model, so get two or three real quotes rather than trusting any single fitted-price claim online - including this one.
At a glance
| Spec | Detail |
|---|---|
| Capacity range | 5-20kWh (modular, 5kWh steps) |
| Inverter | 3.68kW or 5kW |
| Chemistry | LFP (lithium iron phosphate) |
| Warranty | 10 years (battery and inverter) |
| Ecosystem | myenergi (Zappi / Eddi) |
| Entry hardware price | ~£2,150 ex VAT (5kWh) |
| VAT on professional install | 0% until 31 Mar 2027 (5% after) |
Frequently asked questions
How much does the myenergi Libbi cost fully fitted?
Honestly: no independently verified Libbi-specific fitted price exists. Hardware alone is £2,150-£6,995 ex VAT depending on capacity, and fitted battery systems generally range £4,000-£9,000 on this site. Get real quotes for an accurate figure.
Do I need myenergi's Zappi or Eddi to use a Libbi?
No. The Libbi works standalone, but its main advantage is coordinating with the Zappi EV charger and Eddi solar diverter if you have them.
Can I expand a 5kWh Libbi later without buying a new unit?
Yes. Modules are 5kWh each and can be added in place up to a 20kWh total.
What's the Libbi's warranty?
10 years on both the battery and the inverter.
Does the Libbi qualify for 0% VAT?
Yes, when supplied and installed by a professional as part of a qualifying installation, until 31 March 2027 (5% after). Buying hardware alone without installation does not qualify.
Do I need solar panels to use a Libbi?
No. Standalone battery-only installs have qualified for 0% VAT since February 2024, and the battery can charge from a cheap off-peak tariff instead of, or as well as, solar.
Is myenergi Libbi better than GivEnergy or Tesla Powerwall 3?
It depends on priorities. The Libbi wins on modular expansion and EV/solar ecosystem integration. Compare real fitted quotes for your property rather than picking on spec sheet alone.
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