How to choose your home solar battery: Anker Solarbank 3 Pro vs. Marstek Venus A, Venus D and Venus E 3.0

At Robinsun we carefully select the storage systems we offer: not just any battery, but solutions we would use in our own homes, and stand out for their quality and innovation. Working closely with top quality manufacturers Anker and Marstek, we focus on real-world performance, safety and ease of use for European households. 

In this guide we walk you through our four main solar storage systems currently on offer and help you understand which one fits your home, your solar setup and your budget best.

The four batteries at a glance

Anker Solarbank 3 Pro E2700: compact, premium and easy to handle

The Anker Solarbank 3 Pro E2700 is a sleek, compact battery that is easy to move and install.

The main unit integrates a micro inverter, controller and a 2.7 kWh battery in one device.

• Connect up to 8 solar panels directly through 4 MPPTs (up to 3.6 kW PV input).
  
• Expand storage up to 16.2 kWh by stacking 5 extra battery modules.
  
• Get 1.200 W output power for your essential loads.
  
• Use bidirectional charging: from PV and from the grid when prices are low.
  

With the Anker Smart Meter and the Anker app, the Solarbank 3 Pro automatically stores surplus solar energy, avoids export to the public grid and optimises charging schedules. The app experience is one of the strongest points of this battery: clear data, stable connection and simple control.

Choose the Anker Solarbank 3 Pro if you want:

• A compact, easy-to-handle battery with premium Anker quality
  
• Up to 8 panels connected directly to the unit
  
• An intuitive app and smart-meter ecosystem out of the box
  

And remember: with the Anker Power Dock you can connect up to 4 Solarbank systems in parallel, for 4,8 kW of output and 64,8 kWh of maximum storage. While you can install the Solarbank 3 Pro yourself, the Power Dock requires an electrician to install.

Marstek Venus A: affordable modular storage up to 4 panels

The Marstek Venus A is designed as an accessible first step into home storage. It brings modular storage to smaller homes and systems with up to 4 panels.

• The main unit includes a microinverter, controller and 2.12 kWh of storage.
  
• Connect up to 4 panels directly (up to 2.4 kW PV input across 4 MPPTs).
  
• Output power: 1,200 W for your daily home consumption.
  
• Expand storage up to 12.72 kWh by stacking 5 extra 2.12 kWh modules.
  

The Marstek Venus A can charge from your panels or from the grid at off-peak times, and it can also work with an existing kit through the home network. With the Marstek Smart Meter and Smart Box, it supports self-consumption, AI and manual modes, and zero-export control.

Choose the Marstek Venus A if you want:

• A very cost-effective way to add storage
  
• Up to 4 panels connected directly to the battery
  
• Modular storage that grows with you, without construction work
  

Marstek Venus D: for higher power and larger solar systems

The Marstek Venus D is built for bigger installations and higher power levels. It is a modular storage system for homes that want to scale up both PV and storage.

• Connect up to 8 panels directly to the main unit.
  
• Up to 4 kW of PV input through 4 MPPTs.
  
• Output power: 2,200 W to support more loads at once.
  
• Storage expandable up to 15.36 kWh with 2.56 kWh battery modules.
  

The main unit of the Marstek Venus D does not include a battery, so you add exactly the storage you need, when you need it. It can store energy from directly connected panels, from your existing solar installation via the Schuko cable or from the grid during low-price hours.

Choose the Marstek Venus D if you want:

• A storage system for a larger solar installation (up to 4 kW from 8 solar panels connected directly to the storage)
  
• Higher output power (2,200 W) to feed more of your home
  
• Modular expansion up to 15.36 kWh for true home-scale energy
  

Marstek Venus E 3.0: the all-rounder that fits almost any setup

The Marstek Venus E 3.0 is a powerful plug-in battery designed to work seamlessly with kit-based systems and roof-top installations.

• 5.12 kWh of storage per unit, expandable up to 15.36 kWh (3 units).
  
• Up to 2.500 W input from the grid.
  
• Up to 2,500 W output to power your home and provide backup.
  
• Works with any solar system through your home’s wiring and a smart meter.
  

The Venus E 3.0 does not need panels wired directly to it. Instead, it “listens” to your home’s energy flows via the smart meter and charges whenever your solar system produces surplus.

It can also charge from the grid at night and discharge during peak prices.

Choose the Marstek Venus E 3.0 if you want:

• A battery that integrates easily with an existing solar kit without rewiring
  
• High power output (2,500 W) and flexible expansion up to 15.36 kWh
  
• A “universal” storage solution that adapts to different configurations over time
  

And remember: with all 3 Marstek Venus models you can connect up to 3 systems in parallel using the Marstek Smart Box. This triples your output and storage capacity, potentially converting all 3 models into bigger storage systems that can power entire houses easily. While you can install any Marstek Venus model yourself, the Smart Box requires an electrician to install.

How to decide: which battery is right for you?

You can think of the four options like this:

• “Small, premium and intuitive app” → Anker Solarbank 3 Pro E2700. Ideal if you value compact size, Anker’s brand quality and a very polished app, and you want to connect up to 8 panels directly.
  
• “Affordable modular up to 4 panels” → Marstek Venus A. A good choice if you are starting with storage, have or plan a small-to-medium system (up to 4 panels) and want Marstek quality at a very attractive price.
  
• “Bigger solar input and more power” → Marstek Venus D. Best suited if you want a battery that can handle up to 4 kW of PV input, feed more of your home with 2,200 W output, and grow storage up to 15.36 kWh.
  
• “Maximum flexibility with existing solar installations or kits” → Marstek Venus E 3.0 Ideal if you already have a kit or rooftop installation and want a robust all-rounder that plugs into your home, expands easily and offers 2,500 W output.
  

All four options have in common:

• Plugin installation through a Schuko cable
  
• Smart control via app and smart meter
  
• Support for smart charging modes (self-consumption, AI, manual schedules)
  
• Backup AC outlet to keep essential devices running during an outage
  

Ready to choose your solar battery?

Each of these batteries is a solid, tested option within its segment. The right choice depends on three main questions:

• How many panels (or how much PV power) do you want to connect now or soon?
  
• How much storage do you need today, and how much do you want to grow later?
  
• How much power output do you need to cover your essential loads?
  

Still unsure which battery to choose?

Contact us so we can help you clarify your questions and choose the storage solution that best fits your solar system.