Marstek Venus E 3.0 - Frequently Asked Questions

The Marstek Venus E 3.0 is a smart home storage system designed to give you full control over your energy. It delivers independence and backup. Its mission is twofold: cut your electricity bills intelligently and provide a safe power source during blackouts, so your home essentials never stop.

The 3.0 version, launched in 2025, is an evolution of the previous 2.0 version.

What is the Marstek Venus E 3.0?

The Marstek Venus E 3.0 is a plug‑and‑play AC home battery designed for everyday use. Place it where you need it, plug it into a grounded wall outlet, and manage everything from the Marstek app over 2.4 GHz Wi‑Fi. It stores energy (from solar or the grid) and releases it when your home needs it, helping you cut electricity costs and stay protected during outages.

Easy to live with. The compact, die‑cast aluminum body looks discreet and is built to last. It runs ultra‑quiet (under 30 dB), so it blends into your space without noise. The LiFePO chemistry adds long service life and safety.

Ready for every home. The enclosure is IP65‑rated and tested for reliable operation down to −20 °C, so it’s comfortable in harsher environments. A dedicated backup outlet (EPS) keeps essential devices on during a blackout. With the included Smart Meter, the system measures your home’s energy flow in real time, enables zero‑export control, and optimizes charging and discharging.

Grows with you. The Marstek Venus E 3.0 is expandable for whole‑home backup: up to 3 units on single‑phase and up to 9 units on three‑phase setups.

What’s new in the Marstek Venus E 3.0 vs. the Marstek Venus E 2.0?

Marstek is known for feature excellence. Gen 3.0 refines connectivity and simplifies the internals for higher efficiency and easier integration.

• Up to 38.5% more compact and 7.4% lighter. Easier to place and handle.
  
• Die‑cast aluminum chassis (vs. steel in 2.0) for better thermal performance.
  
• Dual RJ45 ports (RS485 + Ethernet) instead of a single 5‑pin RS485.
  
• Integrated PCB. ~50% less wiring and about +5% round‑trip efficiency with lower energy loss.
  
• Traditional right‑angle design in 2.0 replaced by a slimmer, softer form in 3.0.
  
• Optimized power electronics for higher efficiency and cleaner installation.
  

In practice: better performance, fewer cables, cleaner installation, and easier control.

Who is the Marstek Venus E 3.0 for?

Its versatility makes it ideal for two main scenarios,

Homes with solar panels: store excess daytime solar energy to use at night, maximizing self-consumption and savings.

Homes without solar panels: schedule it to charge from the grid during off-peak hours and consume that energy during peak hours, significantly reducing your bill.

You can see how both use cases were tested in Carlos Codina’s YouTube review series. 

How does the Marstek Venus E 3.0 work during a blackout?

The Venus E 3.0 includes a dedicated AC backup outlet to power essential devices when the main grid fails. It’s simple: enable the backup (EPS) mode in the app and plug in your must-have appliances (fridge, router, or a power strip for lights).

In our test, it powered key household devices seamlessly during a simulated outage. Max output in this mode is 2,500 W, ideal for essential electronics and small appliances (not for high-draw loads like an oven or cooktop).

In short, this feature turns a blackout from an emergency into a minor inconvenience, keeping your family connected and safe.

What is day-to-day use like?

Daily operation is simple and automated. Set your preferred mode in the Marstek app and the battery manages charging and discharging.

The system is designed to be compatible with any existing solar setup, whether you use string inverters or microinverters. Both the battery and the Smart Meter need a stable Wi-Fi connection so they can communicate effectively.

How is the Marstek Venus E 3.0 installed?

The physical setup is very straightforward: plug it directly into any grounded wall outlet using the included AC cable. The main configuration is done wirelessly in the Marstek mobile app, where you connect the device to your home’s 2,4 GHz Wi-Fi network.

A key component is the Smart Meter, a small device that measures your home’s energy flow in real time to manage the system intelligently. The Smart Meter is installed inside the main electrical panel. We recommend having an electrician do this for safety and proper operation.

What are the different “modes” in the app?

The Marstek app gives you control with three primary operating modes to tailor battery behavior to your needs:

• Self-Consumption Mode. For homes with solar panels. The battery stores surplus solar energy and releases it when the home needs it. This reduces grid dependence and maximizes savings.
  
• Manual Mode. You control the schedule. Set specific charge times (for example, overnight off‑peak) and discharge times.
  
• AI Optimization Mode. The system uses electricity price data to choose the most cost‑effective times to charge and discharge.

In our test, Self-Consumption and Manual modes work perfectly for immediate savings, while AI mode is being continuously refined to reflect the specifics of the Spanish energy market, as it currently relies on OMIE prices without including grid tariffs.

Zero‑export control

With real‑time smart‑meter integration and adaptive control, Venus E 3.0 can avoid exporting surplus solar energy to the grid. This helps comply with export limits and maximizes self‑consumption to improve savings.

Compatible smart‑meter ecosystems: Marstek, Shelly, HomeWizard, and everHome.

Ready to take control of your energy and start saving?

Discover all the features of the Marstek Venus E 3.0.