Brand: Marstek
4 products in the catalogue.
Our Marstek products
Marstek Venus E 3.0
£1399.99 (9)
The plug and play solar battery that couples to your existing PV system: 5.12 kWh expandable to 15.36 kWh, 2.5 kW output, AI powered.
- Capacity: 5120 Wh LiFePO4 (15.36 kWh by pairing 3 units)
- Power: 2.5 kW bidirectional, backup 2.5 kVA (3.5 kVA peak)
- Efficiency: Battery to AC efficiency > 93.5%, over 6000 cycles
- Rating: IP65, -20 °C to +55 °C, 60 kg
- AI mode with dynamic tariffs, up to £1,150/year in savings
The Marstek Venus E 3.0 is an AC-coupled home battery designed for households that already own solar panels and an inverter. Its 5120 Wh capacity plugs into a standard socket in minutes, without touching the existing installation, and expands up to 15.36 kWh by combining up to three units. The AI mode automatically schedules charging around dynamic electricity tariffs, for annual savings advertised up to £1,150.
In-depth reviewRead our full review →
3.6/5
On paper, the Venus E 3.0's promise fits in one sentence: plug it in and gain solar autonomy without touching the rest of your setup. In practice, that is exactly what happens. The unit sits on the floor or wall-mounts in minutes, the Marstek app detects it instantly, and manual mode works flawlessly from the first connection. User feedback confirms this simplicity, with one recurring caveat: AI mode stays limited until your own electricity supplier is recognised in the app, which sometimes forces manual scheduling in the meantime. The advertised 93.5% efficiency drops a little in real use, between charge and discharge losses, something few manufacturers state as openly. The quiet operation and the sturdiness of the aluminium casing are widely praised. For a household that already has solar installed, it is a simple and affordable way to boost self-consumption without major work.
Marstek Jupiter C Plus
£511.97 (9)
2560 Wh, 4 MPPT and 2400 W of solar input in DC coupling: Marstek's plug-and-play balcony battery expandable to 10240 Wh.
- Capacity: 2560 Wh (LiFePO4), expandable to 10240 Wh
- Solar: 4 MPPT, up to 2400 W input, 99.8% efficiency
- Coupling: DC, with built-in 800 W micro-inverter
- All-weather: IP65, works from -20 °C to +60 °C
- 4 MPPT, 2400 W solar input, fair price
The Marstek Jupiter C Plus is a DC-coupled balcony solar storage battery that sits between the panels and a compatible micro-inverter. Its 4 independent MPPT trackers accept up to 2400 W of panels, with a claimed conversion efficiency of 99.8%. Its 2560 Wh LiFePO4 battery is IP65 rated and expands up to 10240 Wh with additional modules. Plug-and-play installation, control via the Marstek app, 10-year warranty.
In-depth reviewRead our full review →
3.6/5
The Jupiter C Plus shares its base capacity figure (2560 Wh) and several specs with Marstek's own Venus C, a separate AC-coupled model rather than this DC-coupled one: the two are easy to mix up, but they aren't the same unit. In practice, it's a serious balcony battery: its 4 MPPT trackers and 2400 W of solar input let you wire up to 4 panels without worrying much about partial shading, and the HD touchscreen makes initial setup far easier than a phone app alone. Several users report solid compatibility with Shelly Pro 3EM metres and Germany's Ecotracker, plus a responsive support team when the initial pairing gets stuck. Our main reservation concerns availability outside Germany: at the time of writing, there's still no official store or established retailer in France, Italy or Spain, which means going through a third-party Amazon seller at a noticeably higher price than in Germany. For anyone able to order directly from the manufacturer, the value for money remains among the best in the category.
Marstek Saturn B2500-D
£511.97 (7)
The balcony battery that kicked off the trend in Germany: 2.24 kWh expandable to 8.96 kWh, 2 MPPT and 1600 W of solar input, IP65.
- Capacity: 2240 Wh (LiFePO4), expandable to 8960 Wh (4 units)
- Solar: 2 MPPT, up to 1600 W input
- Output: Built in 800 W micro inverter
- All weather: IP65, indoor and outdoor use
- The reference that started the balcony trend, unbeatable value
The Marstek Saturn B2500-D is the balcony solar storage system that popularised the whole category in Germany. DC coupled, its 2 independent MPPT trackers accept up to 1600 W of panels, with an 800 W micro inverter built in. Its 2240 Wh LiFePO4 battery is IP65 rated and expands up to 8960 Wh by stacking up to 4 units. Plug and play installation, control via the Marstek app, 10 year warranty, over 6000 cycles.
In-depth reviewRead our full review →
3.9/5
The B2500-D is more or less the model that started it all: in Germany it is hard to spot a balcony fitted with solar panels without one or more of these small grey towers stacked against the wall next to it. In practice, setup really does live up to the promised 15 minutes: MC4 connectors on the panels, a mains socket, the Marstek app over Wifi, and storage begins right away. Several owners report solid compatibility with Shelly smart metres and the German Ecotracker, with a genuine satisfaction at seeing the household's baseline consumption covered automatically in the evening. The clearest drawback concerns availability and price outside Germany: it is noticeably cheaper and far better distributed through the manufacturer at home than through the handful of resellers available elsewhere. The otherwise solid app also has occasional hiccups after an update, according to recent reports. For anyone able to buy at the German price, the value for money remains among the best in the whole plug and play category.
Marstek Venus E Mini
£999.00
The thinnest of Marstek's plug and play batteries: 2 kWh you plug into a normal socket, installed in 5 minutes, without touching your existing setup.
- Capacity: 2009.6 Wh LiFePO4 (expandable to 6 kWh with 3 units)
- Power: 1.5 kW bidirectional, 1.5 kVA backup (1.8 kVA peak)
- Installation: Plug and play on a wall socket, no MPPT, under 5 minutes
- Rating: IP65, -20 °C to +60 °C, just 105 mm thick for 22 kg
- Marstek's thinnest and cheapest plug-in battery case
The Marstek Venus E Mini (formerly Venus B) is the smallest AC-coupled home battery in the Venus E range: 2009.6 Wh packed into a case just 105 mm thick and weighing 22 kg, plugged into a standard wall socket in a few minutes. It stores surplus solar power or off-peak electricity and delivers up to 1.5 kW, with a dedicated backup outlet for power cuts. Expandable to 6 kWh by pairing three units, it targets tight budgets and homes with no room for a bigger system.
Delivered in a compact box, the Venus E Mini really is installed in minutes: hang it on the wall or stand it on the floor, plug it in, and the Marstek app picks it up straight away. Self-consumption mode with the optional smart meter does a solid job of keeping surplus power off the grid. Real downside: it runs hot, up to 65 °C at full load according to an independent Dutch test, and its standby draw of around 7 W cannot be switched off, which eats into the promised savings. More concerning is Marstek's after-sales reputation: on Trustpilot, its Dutch subsidiary sits at just 2.3 out of 5 across roughly 120 reviews, with recurring complaints about warranty terms (a mandatory account and forced data sharing), units arriving faulty, and slow support responses. As an affordable first step into solar storage, without any rewiring, the Venus E Mini remains convincing on paper, but keep your after-sales expectations realistic.