Short introduction

The Marstek Venus E Max has been developed for homes where a small plug-in battery is too limited. With 10kWh of storage in one unit, the battery can store a large part of daily solar production and supply it back to the home later. This is especially useful for higher evening demand, larger PV systems, working from home, electric appliances or the wish to become less dependent on grid export.

The system combines battery, inverter and energy management in one housing. This makes the Venus E Max easier to understand than a fully customised battery system, but more powerful than many compact plug-in solutions. Because of the high output power, the electrical connection, circuit load and desired power setting must be assessed carefully.

Key benefits of the Marstek Venus E Max

• Powerful 10kWh all-in-one plug-in home battery.
• 3.6kW bidirectional AC power for charging and discharging.
• 3.6kW backup power via separate emergency output.
• Automatic switching to backup mode in less than 10 ms.
• AC-coupled system for easy retrofit with existing solar panels.
• No replacement of the existing PV inverter required in many situations.
• 314Ah LFP cells with more than 10,000 stated cycles.
• Expandable with SmartBox up to a maximum of 10.8kW and 30kWh.
• Possible use in single-phase and three-phase configurations with SmartBox.
• Compatible with Marstek, Shelly, HomeWizard and other common smart meters.
• Support for AI-driven optimisation, VPP and open API integration.
• IP65 housing, passive cooling and whisper-quiet operation below 30 dB.
• Suitable for indoor and outdoor use within the specified temperature range.

Detailed product explanation

The Marstek Venus E Max is an AC-coupled home battery. This means the battery is not installed directly between the solar panels and the PV inverter. Instead, the Venus E Max works through the AC side of the home installation together with your existing solar panel system. Your solar panels therefore continue operating through the existing inverter.

When your solar panels generate more electricity than you use immediately, the Venus E Max can store this surplus. Later, for example in the evening or at night, the battery supplies this energy back to the home. This increases solar self-consumption and makes you less dependent on feed-in compensation or net metering.

Because the Venus E Max can supply 3.6kW of power, this product technically falls into a heavier category than a small plug-in battery. For simple use, the system can be power-limited, but for full output a suitable dedicated circuit or professional connection is strongly recommended. Off Grid Supply can help assess which connection suits your home.

How does the Marstek Venus E Max work?

Which applications is the Venus E Max suitable for?

The Marstek Venus E Max is especially suitable for households that want a large storage capacity but do not want to install a fully traditional hybrid battery system. Thanks to its 10kWh capacity, the battery is interesting for larger homes, families with higher consumption and users who generate a lot of solar energy during the day.

• Homes with existing solar panels and an existing PV inverter.
• Households that want to use more of their own solar energy.
• Large families or homes with high evening and night consumption.
• Users with air conditioning, heat pump control, electric boiler, home office or higher base load.
• Situations where exporting solar energy becomes less financially attractive.
• Users who want smart control based on dynamic energy prices.
• Homes where a large plug-in battery is desired without replacing the PV inverter.
• Applications where backup for selected appliances is important.
• Households that may later want to expand via SmartBox up to a maximum of 30kWh.

Who is this home battery suitable for?

The Venus E Max is not intended as a small entry-level battery for very low consumption. The strength of this system lies in the combination of 10kWh capacity and 3.6kW power. This makes the battery especially suitable for users who deliberately choose generous storage and a more powerful AC-coupled solution.

• Homeowners with a larger PV installation.
• Customers who find 5kWh too limited and want more storage immediately.
• Households with clear evening demand or night consumption.
• Users who want to be less dependent on net metering and feed-in compensation.
• Customers who want a plug-in solution, but with serious power output.
• Users who want to scale up later with multiple units.
• Homes where backup power for individual or selected appliances is useful.
• Customers who value app control, AI optimisation and smart meter integration.

Key technical features

Compatibility, SmartBox expansion and system limits

The Marstek Venus E Max can be used as a standalone 10kWh battery, but is also designed for expansion via the Marstek SmartBox. According to Marstek, the system can be scaled up to a maximum of 10.8kW and 30kWh by using multiple Venus E Max units in parallel.

With expansion, the electrical installation becomes more important. A system with multiple units and higher power levels should be professionally assessed for phase distribution, circuits, residual current protection, grid load, cable routes and backup configuration. Especially with three-phase applications, tailored advice is recommended.

Connection: plug-in convenience, but power requires attention

The Venus E Max is positioned as a plug-in battery, but because of its 3.6kW power output, the connection must be assessed properly. A standard shared circuit is usually not intended for long-term feed-in or consumption at high power. For full output, a dedicated circuit or suitable professional connection is logical.

• Simple plug-in use is possible, depending on local rules and the configured power limit.
• For use around 800W, the battery can be applied more easily within the common plug-in category.
• For 3.6kW charging or discharging, a dedicated circuit or professional connection is strongly recommended.
• The electrical panel, cable route, residual current protection and circuit load must be correct.
• With multiple units via SmartBox, technical assessment is necessary.
• Off Grid Supply can help determine whether your home is suitable for this battery.

Smart control, AI, VPP and app operation

Marstek positions the Venus E Max not only around storage capacity, but also around smart energy control. Via the Marstek app, you can monitor the battery’s operation. The system supports AI-driven optimisation in which weather forecasts, energy prices and consumption patterns can be included.

• Operation and monitoring via the Marstek app.
• Marstek AI for optimisation based on consumption, solar production and market data.
• Support for VPP functionality and scheduling.
• Open API integration for connection with broader smart-home applications.
• Compatible with Marstek, Shelly, HomeWizard and other common smart meters according to Marstek.
• Smart export control to use more solar energy yourself.
• Interesting for dynamic energy contracts and TOU strategies.

Safety, placement and durability

The Venus E Max uses LFP battery cells and has a Battery Management System that monitors charging, discharging, temperature and voltage conditions. The IP65 housing and wide temperature range make the system suitable for robust use, provided the installation location meets the installation instructions.

• LFP / LiFePO4 cells with high stability for stationary storage.
• Multiple BMS protections for charging, discharging, temperature and voltage.
• IP65 protection against dust and water.
• Operation according to Marstek from -20°C to 60°C.
• Noise level below 30 dB, suitable for quiet residential environments.
• Placement on a strong, level surface is recommended because of the weight.
• Ensure sufficient space, accessibility, ventilation and a safe cable route.
• Outdoor placement only when the location and connection are suitable.

What is included in the box?

The exact scope of delivery may vary per supplier or configuration. Always check the current product bundle. In the basic configuration, it concerns the Marstek Venus E Max main unit with integrated battery, inverter and EMS. Smart meters, SmartBox or additional connection materials may be required separately depending on the configuration.

• Marstek Venus E Max 10kWh home battery.
• Integrated inverter and energy management system.
• Power cable / AC connection depending on version.
• Manual and app instructions.
• Possible accessories: Marstek CT003, CT002, SmartBox or EV charger, depending on configuration.
• For full 3.6kW power, additional installation material or a dedicated circuit may be required.
• Always match the final connection to the home installation.

Marstek Venus E Max compared with smaller plug-in batteries

The Venus E Max is significantly more powerful than many compact plug-in home batteries. While smaller models are often around 2 to 5kWh storage and lower output, the Venus E Max offers 10kWh and 3.6kW. This makes the system attractive for larger households, but less logical when the daily surplus is limited.

• Choose the Venus E Max when you have a lot of surplus solar energy available during the day.
• Choose the Venus E Max when 5kWh storage is too limited for your evening consumption.
• Choose a smaller model when your PV surplus is low or your consumption is limited.
• Choose a hybrid home battery when full-home backup or three-phase custom integration is required.
• Have it calculated in advance whether 10kWh capacity fits your actual energy profile.
• Off Grid Supply can compare the Venus E Max with Marstek Venus E 3.0, Anker SOLIX, Zendure, Hyxi and fixed hybrid systems.

Why choose Off Grid Supply?

A powerful plug-in home battery requires proper advice. With 10kWh capacity and 3.6kW output, it is important to look beyond the plug alone. The electrical panel, smart meter, phase load, existing solar panels and desired backup function determine whether this battery is a good fit.

• Specialist in home batteries, plug-in batteries and backup power solutions.
• Experience with Marstek Venus E home batteries and smart meter solutions.
• Advice on 800W plug-in use versus 3.6kW dedicated circuit.
• Assessment of P1 meter, HomeWizard, Shelly, Marstek CT003 and CT002.
• Comparison with Anker SOLIX, Zendure, Hyxi, Felicity and hybrid systems.
• Explanation of dynamic tariffs, VPP, AI control and self-consumption.
• Focus on safety, clear explanation and future-proof energy storage.

Frequently asked questions about the Marstek Venus E Max

Use more of your own solar power with 10kWh storage?

With the Marstek Venus E Max, you choose a powerful plug-in home battery with 10kWh storage, 3.6kW power, smart control and backup function for selected appliances.

Important note: performance, permitted power setting, backup duration, smart meter operation, VPP functionality and suitability depend on the existing electrical installation, electrical panel, smart meter, solar panels, firmware, local regulations, connection method and configuration. Always have high-power use or expansion via SmartBox assessed by a qualified installer.