Marstek Venus E Mini: 2 kWh battery for 800 W kits
The Marstek Venus E Mini is a 2 kWh plugin battery. It stores the solar power your panels make during the day, so you use it in the evening. You plug it into a socket, it needs no changes to your solar kit and it weighs 22 kg. The Venus E Mini is the storage option in our Performance 800 kit, and it is also available with the Eco 800 and City 800 kits.
What is the Marstek Venus E Mini?
The Marstek Venus E Mini is a compact home battery with 2 kWh of storage and 1.5 kW of charge and discharge power, built for plugin solar kits of up to 800 W.
How the Venus E Mini works
The Venus E Mini plugs into a socket and works alongside your kit's micro inverter. A Marstek Smart Meter in your electrical panel tells it when your home sends surplus to the grid. The battery then charges with that surplus and discharges, up to 1.5 kW, when your home needs more power.
Key specifications
| Specification | Marstek Venus E Mini |
|---|---|
| Capacity | 2 kWh (2,009.6 Wh nominal) |
| Battery chemistry | Lithium iron phosphate (LiFePO4) |
| Charge and discharge power | 1.5 kW |
| Backup socket | 1.5 kW, for devices plugged into the battery |
| Charge time from the grid | About 80 minutes, from 0 to 100% |
| Cycle life | 10,000+ cycles |
| Dimensions | 386 × 450 × 105 mm |
| Weight | 22 kg |
| Protection rating | IP65, for indoor and outdoor use |
| Connection | Schuko cable to a standard socket |
| Warranty | 10 years or 10,000 cycles |
Why the Marstek Venus E Mini matters for you
The Marstek Venus E Mini moves the solar power your kit makes at midday to the evening, when your home uses more electricity.
You save about €120 a year
With the Venus E Mini you save about €120 a year on top of what your panels already save. The figure assumes:
- the battery fills with surplus on 250 days a year;
- about 1.7 kWh of each 2 kWh charge reaches your appliances after conversion losses;
- each kWh costs €0.29, the EU average household price in the second half of 2025 (Eurostat).
1.7 kWh × 250 days = 425 kWh a year, worth about €120. Your result depends on your location, your consumption and your tariff. To estimate your kit's production, use the free PVGIS calculator.
What 2 kWh runs
The Venus E Mini covers your base evening loads. A fridge, a router, LED lights and devices on standby draw about 100 W together, so 1.7 kWh runs them for about 17 hours. An oven or a kettle draws more than 1.5 kW, so the grid covers the rest.
Cheaper tariffs and power outages
The Venus E Mini also charges from the grid, from empty to full in about 80 minutes. If your tariff has cheaper hours, it charges then and discharges when power costs more. During a power outage, the 1.5 kW backup socket keeps devices plugged into the battery running. It does not power your home's wiring.
Built to last
The cells are rated for more than 10,000 cycles: more than 27 years at one full cycle a day. Marstek gives a 10-year warranty, and the IP65 rating lets you place it on a balcony, in a garage or in a utility room.
Which Robinsun kit is right for you?
The Marstek Venus E Mini works with three 800 W kits: the Performance 800 for the most power, the Eco 800 as a starter kit and the City 800 for lightweight panels on a balcony railing.
| Kit | Panels | Panel power | Maximum output | Mount | Battery options |
|---|---|---|---|---|---|
| Performance 800 | Two Aiko Neostar 3P 485 Wp | 970 Wp | 800 W | Balcony, wall, flat roof, tile roof or metal roof | Venus E Mini (2 kWh) or Venus E 3.0 (5.12 kWh), with Smart Meter |
| Eco 800 | Two Canadian Solar 465 Wp | 930 Wp | 800 W | Balcony, wall, flat roof, tile roof or metal roof | Venus E Mini (2 kWh) or Venus E 3.0 (5.12 kWh), with Smart Meter |
| City 800 | Four flexible 200 Wp | 800 Wp | 800 W | Fixed to the balcony railing with cable binders and adhesive pads | Venus E Mini (2 kWh), with Smart Meter |
The Performance 800 uses panels from Aiko, which shares first place for module efficiency at 25% in the TaiyangNews ranking of October 2026. See all our solar kits with storage or compare the three kits in our guide to choosing the right 800 W plugin solar kit.
Frequently asked questions
Is 2 kWh of storage enough for my home?
The Marstek Venus E Mini's 2 kWh covers base and essential evening loads, such as a fridge, a router, lights and devices on standby. It does not run every appliance through the night. For a larger home or higher evening use, choose the Venus E 3.0 with 5.12 kWh in the Performance 800 or Eco 800 kit.
Do I need the Smart Meter with the Venus E Mini?
Yes, if you want the Venus E Mini to store your surplus automatically. The Smart Meter tells the battery when your home sends power to the grid. Without it, you use manual schedules or charge from the grid. A qualified electrician installs the Smart Meter in your electrical panel; you plug in the battery yourself.
Can I use the Venus E Mini without solar panels?
Yes. The Marstek Venus E Mini charges from the grid during cheaper tariff hours and discharges when power costs more. This saves you money only if your tariff has a clear price gap between cheap and expensive hours. With solar panels, the battery also stores the surplus your plugin solar kit produces during the day.
Will the Venus E Mini power my home during a power outage?
The Venus E Mini's 1.5 kW backup socket keeps devices plugged directly into the battery running during a power outage, such as a fridge, a router or a laptop. It does not power the lights and sockets connected to your home's wiring. How long it runs depends on the charge level and what you plug in.
Can I add the Venus E Mini to a solar kit I already have?
Yes, with most plugin solar kits of up to 800 W. The Marstek Venus E Mini connects through a household socket, on the AC side of your home, not to your panels or micro inverter. To store your surplus automatically, you also need the Marstek Smart Meter, installed in your electrical panel by a qualified electrician.
Get your Performance 800 with battery today
The Marstek Venus E Mini stores 2 kWh of your own solar power for the evening, plugs into a socket and is rated for more than 10,000 cycles. Pair it with the Performance 800 kit and a mount for your balcony, wall or roof.
Get the Performance 800 with mount and battery
Not sure which kit fits your home? Contact us and we help you choose.
