Marstek Venus E Mini

Cost

Price Sold out at Marstek Direct in September 2026.

£999

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

£500

See it at Marstek

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 kWh

Continuous output 1,500 W both ways, peaking at 1,800 W.

1.5 kW

Warranted cycles Marstek quotes more than 6,000.

6,000 cycles

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

Yes

Solar input None at all. The Venus E is AC coupled: it charges off the grid when power is cheap, or off an inverter that already has the panels.

0 kW

Smart meter Marstek's own CT002, or a Shelly Pro 3EM, EM Gen3 or Pro EM-50.

Its own or Shelly

Home Assistant Nothing official, but several community integrations reach it over Modbus TCP on your own network, with no cloud in the way.

Community, local

UPS switchover Under 15 ms on the 3.0. Marstek quotes under 10 for the Venus E 4.0, which Britain does not get.

15 ms

Noise Under 30 dB, and there is no fan in it at all: the Venus E cools by natural convection.

30 dB

Depth of discharge Marstek warrants its cycles at 90%, so a 5.12 kWh Venus E is a 4.6 kWh one in practice and its price per kWh is that much worse than the table shows.

90 %

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

AC sockets One emergency power socket, rated 2,500 W.

1

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 Wired LAN, and RS485 on top for anyone wiring it into something older.

Yes

Wi-Fi

Yes

Bluetooth

Yes

Tech

App

Yes