Marstek debuts new plug-in battery series

China-based Marstek Energy has launched a new plug-in battery product line for residential use.

“With the Venus family, Marstek expands plug-in batteries into broader residential energy scenarios, including whole-home backup, intelligent energy management, EV charging integration, and scalable home energy ecosystems, accelerating the transition toward smarter and more sustainable energy living,” the manufacturer said in a statement.

The new product line includes three sytems: Venus E Mini, Venus E Gen 4.0 and Venus E Max. The products target different segments of the residential market, ranging from entry-level balcony solar storage to larger home energy systems with backup power, energy management and electric vehicle charging integration.

The Venus E Mini is described by the company as compact plug-in battery aimed at apartment dwellers and homeowners with limited installation space. The system provides 1.5 kW of bidirectional power and 1.5 kW of backup output, with peak output reaching 1.8 kW.

The 2 kWh battery incorporates Marstek’s AI-based energy management platform, which supports electricity demand forecasting and time-of-use optimization. The unit features a wall-mounted design and weighs 22 kg, enabling installation in space-constrained residential settings.

The Venus E Gen 4.0 is an AC-coupled residential battery designed for homes with existing rooftop solar installations. The system offers 5 kWh of storage capacity and supports charging and discharging at up to 3 kW. It also provides backup power functionality and compatibility with EV charging systems.

According to Marstek, the latest generation has a smaller footprint and lower weight than previous versions, while incorporating a redesigned display interface. The battery uses 314 Ah lithium iron phosphate (LFP) cells and is rated for more than 10,000 charge-discharge cycles.

Using the company’s SmartBox platform, multiple units can be connected in parallel to achieve up to 15 kWh of storage capacity and 9 kW of power output. The system can also be integrated with Marstek’s portable EV charging products.

As for the Venus E Max, it targets households with higher electricity consumption and existing rooftop PV systems. The battery combines 10 kWh of storage capacity with 3.6 kW of bidirectional grid-connected and backup power output.

Marstek said the system is designed to increase solar self-consumption and provide whole-home backup capability. Through the SmartBox expansion architecture, up to three units can be connected in single-phase or three-phase configurations, allowing capacity to scale to 30 kWh and power output to 10.8 kW.

Like the Venus E Gen 4.0, the Venus E Max uses 314 Ah LFP cells and is rated for more than 10,000 cycles. The system also supports integration with the company’s portable EV charging solutions.