Marstek Venus E Mini: 1.5 kW and 2 kWh in one wall-mounted unit
Venus E Mini is a complete storage unit, not a standalone inverter. The inverter, a 2 kWh LiFePO4 battery and the controller sit in one IP65 wall-mounted enclosure with Plug and Play connection to a 1x220 V supply. Rated output 1.5 kW, short-term peak 1.8 kW, efficiency 94 %, battery voltage 51 V, operating range -20 to +55 °C, Wi-Fi and Bluetooth communication.
What 2 kWh at 1.5 kW actually covers
1.5 kW is the limit of SIMULTANEOUS load, not a daily total. That rating fits a fridge, lighting, a router and a gas boiler with a circulation pump. A water heater, electric hob, welding or a direct-on-line pump start do not. 2 kWh gives roughly two hours of that set; the exact figure depends on actual consumption.
When Venus E Mini is the wrong choice
The bidirectional design lets the unit charge from the grid and feed the load, switching automatically. But the 1.5 kW / 2 kWh pair is fixed: no external battery can be added to this model. For a house peaking at 3-5 kW, or for more reserve, look at Venus E (2.5 kW, 5.12 kWh) or Venus X (6 kW, 10 kWh). If the system is built from separate components around solar panels, start with 3 kW hybrid inverters and move up the range in the hybrid inverter catalogue, sizing capacity from batteries for inverters.