Marstek MARSTEK Venus E Gen 3.0

Name: MARSTEK Venus E Gen 3.0
Brand: Marstek
SKU: MST-BIE5-2500
Price: 990.00 EUR
Availability: InStock
Author: JouleSpecs

Manufacturer's list price

990 € ≈ $1,069

JouleSpecs does not sell and does not show shop prices: check the price where you buy.

Sheet on the Marstek website →

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Data from official source

Sheet curated by JouleSpecs — We check every spec sheet against the manufacturer's own documentation: each value carries its source and the date we read it. Published Sept. 22, 2026 · Last updated Oct. 6, 2026 · Data verified Sept. 22, 2026

MARSTEK Venus E Gen 3.0 is a balcony storage unit that connects on AC: it has no inputs for panels, it plugs in downstream of a solar system, or directly into a home outlet, and exchanges energy with the grid from there. Up to three units connect together.

From the app you choose how it works: by consumption, following a meter; by schedule, set by the user; or following the price of energy, to charge during the cheapest hours and give back during the expensive ones. When the grid fails, a separate outlet keeps giving power. Toward the home it feeds in within the simplified threshold by default; a higher output is a separate mode.

It's for anyone who already has a wired solar system and wants to add storage with no construction work, or for anyone on an hourly tariff. It isn't for anyone wanting to attach panels directly to the battery.

01 · Verified data

Technical specifications

Cell chemistry LFP (lithium iron phosphate)

Feed-in limit 800 VA

Cost per kWh 390,43 €/kWh

official manufacturer list price — on nominal capacity

Round-trip efficiency 93.5 %

Standby consumption Marstek does not state it.

where we looked

Parameter	Value	Source
Dimensions	48 × 15.3 × 62.4 cm (18.9 × 6.0 × 24.6 in)	manufacturer website
Weight	60.0 kg (132.3 lb)	manufacturer website
Nominal capacity	5.12 kWh	Declared by the brand
Depth of discharge	90 %	Declared by the brand
Cell chemistry	LFP (lithium iron phosphate)	Declared by the brand
Expandable	Yes	Declared by the brand
Maximum expanded capacity	15.36 kWh	Declared by the brand
Battery voltage	51.2 V	Declared by the brand
Feed-in limit	800 VA	Declared by the brand
Grid charging	Yes	Declared by the brand
Maximum charge power	2.5 kW	Declared by the brand
Dynamic tariffs	Built in	Declared by the brand
Backup power	EPS (brief interruption)	Declared by the brand
Backup output	2500 W	Declared by the brand
Rated cycles	6000 cicli	Declared by the brand
Warranty	10 anni	Declared by the brand
Round-trip efficiency	93.5 %	Declared by the brand
Ingress protection	IP65	Declared by the brand
Minimum temperature	-20 °C	Declared by the brand
Maximum temperature	55 °C	Declared by the brand
Declared standards	EN 50549, IEC 62477	Declared by the brand
Official list price	1999 €	Declared by the brand
Usable capacity	—	Not declared
Cell supplier	—	Not declared
Inverter included	—	Not declared
Maximum solar input	—	Not declared
MPPT trackers	—	Not declared
Switchover time	—	Not declared
Capacity at end of cycle life	—	Not declared
Guaranteed throughput	—	Not declared
Guaranteed remaining capacity	—	Not declared
Standby consumption	—	Not declared
Mounting	—	Not declared
Cell heating	—	Not declared
Noise level	—	Not declared
Works without internet	—	Not declared
Local control	—	Not declared
Open protocols	—	Not declared
Home Assistant integration	—	Not declared
Where the data is hosted	—	Not declared
Remote updates	—	Not declared
App required for setup	—	Not declared
Battery passport	—	Not declared
Carbon footprint	—	Not declared
Recycled content	—	Not declared

Which documents this page rests on

43A212010001 BIE5 01 140mmx210mm 120g 80g VENUS-E 3.0 2025.05.08.29 compressed 39 rows of the table · file hosted on cdn.shopify.com

The rest of the data comes from 3 pages on the manufacturer's site, cited row by row in the table above.

A manual or a datasheet counts as a source even when the original file is hosted elsewhere: what matters is the document, not the server. Where that happens, it is stated above.

02 · The numbers

What it really costs

Cost per kWh 390.430 €/kWh official manufacturer list price — on nominal capacity

How we worked it out

price: 1999
nominal capacity: 5.120

Battery life cycles 3650 cycles warranty years

the manufacturer does not state the guaranteed total energy throughput, which for heavy users is often the limit that runs out first

How we worked it out

stated cycles: 6000
warranty years: 3650

Cost of stored energy 0.114 €/kWh warranty years

the manufacturer does not state the guaranteed total energy throughput, which for heavy users is often the limit that runs out first
on nominal capacity: the manufacturer does not state the usable figure, so the real cost is higher

How we worked it out

price: 1999
nominal capacity: 5.120
battery life cycles: 3650
round-trip efficiency: 93.500
energy delivered over the whole life: 17473

Energy density 85.300 Wh/kg

on nominal capacity: the manufacturer does not state the usable figure, so the true number is lower

How we worked it out

nominal capacity: 5.120
weight: 60

These numbers are calculated, not stated: they have no source to cite, they have a formula you can redo. The price used is the manufacturer's list price, which is stable and the same in every country — not a shop's price on the day.

03 · Summary

Pros and cons

In favour

It follows the price of energy through the day and shifts charging to the hours when it costs less.
When the grid fails, a separate outlet keeps giving power.
The maximum efficiency between battery and AC side is above 93.5%.
Up to three units connect together to add capacity.

Worth knowing

By default it feeds into the home only within the simplified threshold: the higher output is a separate mode.
It discharges down to 90% of nominal capacity: anyone counting the kWh on the spec sheet uses about a tenth less.
The warranty lasts 10 years: anyone doing one cycle a day completes about 3,650, fewer than the 6,000 stated.

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