Jackery SolarVault 3 Pro Max

Cost

Price Jackery's RRP. The early bird sale that opened its British launch in October 2026 runs for a month and takes it to £1,099.

£1,399

Price per kWh The unit on its own, divided by its capacity. No installation is included.

£555

See it at Jackery

Battery

Battery chemistry LFP packs tolerate regular charging to 100%; NMC packs are usually happier kept below it.

LFP

Usable capacity What you can actually take out, which is less than the figure on the box.

2.52 kWh

Continuous output 2,500 W once an installer has commissioned it, and 800 W until then.

2.5 kW

Round trip efficiency Measured by energienerds over four full cycles at 800 W, between 83.8 and 84.8 per cent. Well short of the 90 the Anker and the Zendure manage, and it is a fifth of the gap in what a year saves.

84.4 %

Can be added to Whether you can bolt on more capacity later.

Yes

Expands to Five BP2500 modules on one tower.

15.12 kWh

Solar input Four MPPTs, 1,000 W each.

4 kW

Smart meter Jackery's own meter, a TIC, D0 or P1 reader, or a Shelly Pro EM-50 or Pro 3EM.

Its own or Shelly

Home Assistant Jackery's own integration, over a broker you host. You put its address into the Jackery app, which issues the token Home Assistant then uses, so the data never leaves the house.

Official, local

UPS switchover Jackery says 20 ms, and says plainly that this is backup rather than a professional UPS.

20 ms

Noise Jackery quotes 30 dB at most, and says it is inaudible at a metre.

30 dB

Operating temperature The range the maker will stand behind. The cold end is the one that matters in a British garden, and a battery that stops charging at zero stops charging most winter mornings.

-20 °C to 55 °C

Bypass output Jackery quotes up to 2,990 W through the socket.

2.99 kW

Charging

Weather rating The IP rating: the first digit is how well it keeps dust out, the second water. Below IP65 it wants to be indoors. Ranked as the higher number, though strictly a 7 is an immersion test where a 6 is a jets test, so one does not always include the other.

IP65

Warranty

10 years

Ethernet port A wired connection, which matters because these get fitted on outside walls and at the ends of drives, where the wifi is thinnest.

Yes

Wi-Fi 2.4 GHz only. A router that puts both bands under one name usually still gets it on; a 5 GHz network it cannot see is the commonest reason one of these will not pair.

Yes

Bluetooth

Yes

Tech

App

Yes