Marstek Venus A – plug & play home battery (2.12 kWh per module) with 4 MPPT and backup power

The Marstek Venus A is a compact, modular energy storage system that combines battery storage and power conversion in one unit. You can connect solar panels directly via four MPPT inputs (up to 2.4 kW), or use it as an AC-coupled battery within an existing PV setup. This helps increase self-consumption, reduce grid import, and provides a practical backup outlet for essential loads.

Key benefits

• Modular storage: start at 2.12 kWh and expand up to 12.72 kWh
• 4 MPPT solar inputs: up to 2.4 kW PV input for multiple strings/orientations
• Bidirectional AC (on-grid): 1.2 kW charge/discharge on 230 V (single phase)
• Backup (off-grid): 1.2 kW continuous, 1.44 kW peak (60 s) with fast switching
• Smart monitoring: Bluetooth, WiFi and Ethernet
• LFP batteries: long lifetime (>6000 cycles) and 90% DoD (per datasheet)
• IP65 enclosure: suitable for indoor and (sheltered) outdoor installation, wide temp range

How the Marstek Venus A works

1) Direct PV connection (DC via 4 MPPT)

Connect PV strings directly to the MPPT inputs (MC4). With four independent MPPT channels, the system can handle different string lengths, tilts or orientations more efficiently. The Venus A charges from solar and then supplies energy to your home when you need it.

2) AC-coupled add-on for existing PV systems

Already running solar with a (micro)inverter or string inverter? The Venus A can be used as AC-coupled storage. It uses the bidirectional 230 V connection (single phase) to charge and discharge based on household consumption. Combined with a metering solution (smart meter/P1 or energy meter), it can also help limit unwanted feed-in.

Backup power (EPS / off-grid) – what to expect

The Venus A includes a backup output for essential loads such as router/modem, lighting, refrigeration, heating controls or a small workspace. Continuous output is 1.2 kW with a short peak up to 1.44 kW (60 seconds). For safe use, select your backup circuit carefully and follow local electrical rules.

Capacity and expansion

Each battery module provides 2.12 kWh of storage. You can expand later as your energy needs grow, up to a maximum of 12.72 kWh total storage capacity.

Technical specifications (overview)

• Battery chemistry: LiFePO₄ (LFP)
• Storage per module: 2.12 kWh (expandable up to 12.72 kWh)
• Depth of discharge (DoD): 90%
• Cycle life: >6000 cycles (25 ℃)
• PV input: max 2.4 kW, 4 MPPT channels, MPPT range 16–60 V, max 20 A per channel
• AC in/out (on-grid): nominal 1.2 kW, 230 V / 50 Hz, single phase (N + PE)
• Backup (off-grid): 1.2 kW continuous, 1.44 kW peak (60 s), 230 V / 50 Hz
• Communication: Bluetooth, WiFi, Ethernet
• Protection: IP65
• Operating temperature: -20 ℃ to +60 ℃
• Dimensions (main unit): 400 × 285 × 158 mm, weight 24 kg
• Dimensions (battery module): 400 × 285 × 108 mm, weight 17 kg

FAQ – Marstek Venus A

1) Can I use the Marstek Venus A without solar panels?

Yes. The Venus A can charge via AC (on-grid) and later discharge to support household consumption. Solar usually delivers the best savings because you store more self-generated energy.

2) Will it work with my existing inverter or microinverters?

In many cases yes, because it can be used as an AC-coupled battery. Alternatively, you can connect (part of) your PV directly to the 4 MPPT inputs.

3) How do I reduce unwanted feed-in to the grid?

Accurate control typically requires measuring import/export (for example via smart meter/P1 or an energy meter). With that data, the system can better match charge/discharge to household demand.

4) Can I expand later with extra battery modules?

Yes. The Venus A is modular: you start smaller and expand later up to 12.72 kWh total.

5) What loads can I realistically run on backup power?

Essential loads up to 1.2 kW continuous (with a short 1.44 kW peak). High-power appliances like dryers, ovens or large electric heaters typically exceed the backup outlet capability.

6) How fast does backup switching happen during a power outage?

Switching is designed to be fast to keep critical devices running as smoothly as possible. Actual behavior depends on the connected load and your backup configuration.

7) Is the Marstek Venus A suitable for outdoor use?

The enclosure is IP65 and specified for a wide temperature range. Prefer a sheltered location and always follow installation guidelines.

8) How do I monitor and control the system?

Monitoring and settings are handled via the app and the available communication options (Bluetooth, WiFi, Ethernet). You can track production, storage and consumption and adjust operating modes.

9) What PV voltage and current limits apply to the MPPT inputs?

Per the datasheet, MPPT range is 16–60 V with a maximum of 20 A per channel. Always verify your series/parallel PV configuration against these limits.

10) Is this a good fit for small households or balcony PV?

Yes. The compact design, multiple MPPT inputs and practical (but limited) AC and backup output make it well suited for smaller setups. For larger homes with high peak loads, a higher-power hybrid system is often more appropriate.