MARSTEK CT002

With the MARSTEK Venus D, you can use more of your self-generated solar power and reduce your electricity costs long-term.

Thanks to the combination of a large battery storage system and intelligent energy management, you can store excess solar energy and use it exactly when your household needs it.

Under optimal conditions, the MARSTEK Venus D can enable annual electricity cost savings of up to approx. €1,797.

These savings result from two intelligent functions:

1. More self-consumption through stored solar energy

A PV system generates most of its electricity during the day. However, many households need energy especially in the evening and at night.

The Venus D stores excess solar power and makes it available again later.

This allows you to:

• use more free solar energy yourself;
• draw less electricity from the grid;
• use your PV system more economically.

2. Intelligent energy optimization with MARSTEK Intelligence

The integrated MARSTEK Intelligence energy management system automatically optimizes the energy flows between:

• PV generation;
• battery storage;
• household consumption.

When using dynamic electricity tariffs, the Venus D can additionally help optimize electricity costs:

• store energy when electricity prices are lower;
• use stored energy when electricity prices are higher.

Example calculation of possible savings

The model calculation is based on the following assumptions:

Solar power generation

• PV input power: 4,000 Wp
• annual solar yield:
  4,000 Wp × 1,160 kWh/kWp ≈ 4,640 kWh/year

Self-consumption

• assumed self-consumption rate: 85%

Calculation:

4,640 kWh × 85% × €0.40/kWh

= approx. €1,578 savings per year

Additional optimization through intelligent charging management:

≈ €219 per year

Total possible savings:

€1,578 + €219 = approx. €1,797 per year

Actual savings may vary depending on the PV system, location, electricity consumption, and use of the storage system.

The MARSTEK Venus D helps you use your solar energy more efficiently, increase your energy independence, and optimize electricity costs long-term.

The MARSTEK Venus D was developed for households that want to use their solar energy more efficiently, increase self-consumption, and optimize their energy supply long-term.

The Venus D is particularly suitable for the following users:

① Households with higher solar power yields

If your PV system generates more electricity during the day than is currently needed, a larger battery storage system can help make better use of this energy.

The Venus D is particularly suitable for households that:

• own a larger PV system;
• consume little electricity during the day;
• want to store excess solar energy and use it later.

This way, more self-generated solar power can be used in your own household instead of being fed unused into the grid.

② Families with higher energy consumption

The Venus D is a suitable solution for households with a higher daily energy requirement, for example:

• multi-person households;
• families with increased evening consumption;
• home office users;
• households with multiple electrical devices.

Thanks to the larger storage capacity, stored solar energy can also be used in the evening and at night, reducing grid electricity consumption.

③ Users who want flexible long-term expansion

The MARSTEK Venus D features a modular storage concept and can be flexibly adapted to future energy requirements.

The storage capacity can be expanded:

2.56 kWh base version

up to

15.36 kWh maximum capacity

This allows households to start with a suitable capacity and expand the storage later when:

• electricity consumption increases;
• a larger PV system is installed;
• greater energy independence is desired.

Summary

The MARSTEK Venus D is particularly suitable for users who not only want to reduce electricity costs short-term but are looking for a future-proof energy storage solution for their home.

It offers a combination of:

high storage capacity
intelligent energy management
flexible expandability
efficient use of solar energy

The biggest difference of the MARSTEK Venus D is that it not only stores solar energy but offers a powerful and expandable energy solution for households.

Compared to compact storage solutions, the Venus D offers:

• higher PV integration options;
• stronger AC power;
• more storage capacity for long-term energy requirements.

① Higher PV input power for larger solar systems

The MARSTEK Venus D supports a maximum PV input power of up to 4,000 Wp and features 4 independent MPPT inputs.

This allows different solar modules to be optimized individually.

This is particularly helpful when:

• solar modules are aligned differently;
• individual modules receive different light conditions;
• the PV system is to be expanded flexibly.

Intelligent MPPT technology helps use the available solar yield more efficiently.

② Higher AC power for more application possibilities

The Venus D supports a maximum bidirectional AC power of up to 2,500 W.

This makes the system suitable not only for small applications but also for households with higher daily energy requirements.

Typical applications may include:

• consumer electronics;
• computers and work equipment;
• smaller household appliances;
• general household loads.

Actual usage depends on the power consumption of the connected devices and the respective installation conditions.

③ Larger storage capacity and flexible expansion

While many compact storage solutions have a fixed capacity, the MARSTEK Venus D offers a modular storage concept.

The capacity can be flexibly expanded:

2.56 kWh

up to

15.36 kWh

This allows the storage to grow with the future requirements of the household, for example with:

• increasing electricity consumption;
• a larger PV system;
• the desire for greater energy independence.

Summary

The MARSTEK Venus D is particularly suitable for users looking for more than a simple storage solution.

With higher PV power, stronger AC output, and flexible expandability, the Venus D offers a future-proof solution for households that want to use their solar energy efficiently long-term.

The MARSTEK Venus D features a modular storage system that can be flexibly adapted to different energy requirements. The right storage capacity depends primarily on the size of the PV system, daily electricity consumption, and the desired degree of energy independence.

When selecting the right storage size, the following factors in particular should be considered:

• output and annual yield of the photovoltaic system;
• average electricity consumption of the household;
• electricity consumption in the evening and at night;
• desired use of self-generated solar power.

2.56 kWh storage capacity – suitable for smaller energy requirements

The base version with 2.56 kWh is suitable for users who want to increase the self-consumption of their solar energy and store excess solar power.

This capacity is particularly suitable for:

• smaller PV systems;
• households with moderate electricity consumption;
• users looking for a compact storage solution.

Stored energy can be used, for example, for typical household loads such as lighting, routers, computers, or consumer electronics.

5 to 8 kWh storage capacity – for households with higher energy requirements

A larger storage capacity offers advantages for households that generate more solar power during the day or have higher electricity consumption in the evening.

This size is particularly suitable for:

• family households;
• larger PV systems;
• households with regular evening consumption;
• users with home offices or multiple electrical devices.

Thanks to the larger storage capacity, more self-generated solar energy can be stored and used time-shifted.

10 kWh or more – for maximum energy independence

A larger storage capacity makes sense for households with high energy consumption or the desire to cover as large a share of their electricity needs with their own solar energy as possible.

This solution is particularly suitable for:

• larger photovoltaic systems;
• households with high daily electricity consumption;
• users striving for greater long-term energy independence.

Flexible expansion with the MARSTEK Venus D

An advantage of the MARSTEK Venus D is its modular expandability. Users can start with a suitable initial capacity and later adapt the storage to increasing energy requirements.

The storage capacity can be expanded:

from 2.56 kWh up to 15.36 kWh

This makes the Venus D suitable for both current requirements and future developments, for example with:

• increasing electricity consumption;
• expansion of the PV system;
• increasing use of electrical devices in the household.

The optimal storage size is not necessarily the largest capacity, but the capacity that best matches the household's individual energy profile.

Yes. The MARSTEK Venus D can be used both for new installations and for expanding existing solar systems.

It is particularly suitable for users who already generate solar energy and want to increase their self-consumption through additional storage capacity.

Typical areas of application are:

• new PV installations with battery storage;
• existing balcony power plants with subsequent storage expansion;
• smaller photovoltaic systems to be supplemented with a storage solution.

Expanding existing solar systems

If the following components are already present:

• solar modules;
• micro-inverters;
• existing balcony power plant or PV system;

the Venus D can be integrated as an additional storage solution depending on the system configuration.

By storing excess solar energy, households can use more self-generated electricity at a later point in time and increase their self-consumption.

What should be checked before installation?

Before integration, the following points in particular should be considered:

• technical data and output of the existing PV components;
• compatibility of the inverter and connection configuration;
• requirements of the existing energy system;
• local installation regulations.

The MARSTEK Venus D thus offers a flexible solution both for new solar projects and for households that want to expand their existing PV system with a powerful battery storage system.

The MARSTEK Venus D is suitable for both balcony power plants and small to larger photovoltaic systems. It is particularly interesting for users who want to store more solar energy, increase self-consumption, and optimize their energy supply long-term.

Depending on the application, the Venus D offers different advantages:

For users with a balcony power plant

The Venus D can be a suitable solution when available solar energy cannot be fully used directly.

Typical requirements:

• store excess solar power;
• use stored energy in the evening or at night;
• increase the self-consumption of the balcony power plant.

The Venus D is particularly interesting for users who need a higher storage capacity and want to expand their energy system long-term.

For users with a small or medium-sized PV system

With existing or new photovoltaic systems, the Venus D offers additional advantages through:

• higher PV integration options;
• larger storage capacity;
• intelligent energy management with MARSTEK Intelligence.

This allows more self-generated solar energy to be used in the household and grid electricity consumption to be reduced.

Which solution fits which need?

The MARSTEK Venus D is particularly suitable for households with higher energy requirements or the desire for a long-term expandable storage solution.

For users looking for a compact Plug & Play solution specifically for a balcony power plant, smaller storage solutions may be a suitable alternative.

For households wanting more capacity, higher PV power, and flexible expansion options, the MARSTEK Venus D offers a powerful storage solution.

Yes. The MARSTEK Venus D supports backup power supply (EPS function) and can continue to supply selected essential loads with energy during a power outage.

The Venus D offers:

• up to 2,200 W backup output power;
• a switchover time of less than 15 ms.

This allows certain electrical devices to continue operating even when the grid supply is interrupted.

Which devices can be supplied in backup mode?

Depending on the power requirements of the connected devices, the backup function is suitable, for example, for:

• WiFi routers and communication devices;
• lighting;
• computers and work equipment;
• smaller household appliances;
• other important electrical loads.

The devices that can actually be used depend on their power consumption and the available battery capacity.

What should be considered when using the backup function?

The backup power of the Venus D depends on several factors:

• total power of the connected loads;
• available battery capacity;
• individual usage situation;
• correct installation of the system.

The MARSTEK Venus D was designed to support essential power supply in the household and offer additional security during power outages.

The MARSTEK Venus D was developed with an integrated all-in-one concept to simplify the installation and use of a battery storage system.

Important components are already integrated in the system:

• battery storage;
• inverter;
• intelligent energy management system.

This means fewer separate devices are required and system integration can be implemented more easily than with conventional solutions consisting of multiple individual components.

How does the installation work?

The basic setup typically includes:

• connecting the PV components;
• connection to the power grid or the designated electrical installation;
• setup and configuration via the energy management system.

Thanks to the Plug & Play concept, the Venus D was designed for the simplest possible integration into existing or new solar systems.

What should be considered before installation?

The specific installation depends on individual circumstances, in particular:

• existing PV system;
• electrical infrastructure of the building;
• installation location;
• local regulations and requirements.

We recommend checking the technical prerequisites before installation and considering the applicable requirements at the respective location.

The MARSTEK Venus D combines powerful storage technology with a simplified system structure and thus offers a flexible solution for households that want to use their solar energy more efficiently.

The MARSTEK Venus D uses modern LiFePO₄ battery technology (lithium iron phosphate), known for its high safety, thermal stability, and long service life.

Compared to conventional lithium battery technologies, LiFePO₄ cells offer particularly stable cell chemistry and are therefore well suited for long-term use in stationary energy storage systems.

What safety features does the Venus D offer?

The Venus D features an intelligent battery management system (BMS) that continuously monitors the battery condition and supports important protection functions, including:

• overcharge protection;
• deep discharge protection;
• overcurrent protection;
• short-circuit protection;
• temperature monitoring.

This supports safe and reliable operation in daily use.

How long does the Venus D battery last?

The MARSTEK Venus D is designed for long-term use and achieves more than 6,000 charge cycles.

Additional product features:

• LiFePO₄ battery technology for high stability and long service life;
• IP65 protection class for improved protection against dust and water;
• operating temperature range from -20 °C to 60 °C;
• 10-year warranty for long-term investment security.

The MARSTEK Venus D combines durable battery technology, intelligent safety monitoring, and robust construction to offer households a reliable storage solution for the long-term use of solar energy.

Yes. The MARSTEK Venus D supports the use of dynamic electricity tariffs and enables smarter control of energy consumption with MARSTEK AI.

Thanks to intelligent energy management, the charging and discharging process can be optimized based on various factors, such as available solar energy, current energy consumption, and electricity price trends.

This allows stored energy to be used more purposefully in order to manage energy costs more efficiently.

What advantages does the combination with dynamic electricity tariffs offer?

In combination with a dynamic electricity tariff, the Venus D can help:

• make better use of favorable electricity prices;
• preferentially store energy during low-price periods;
• use stored energy in the household during higher-price periods;
• control grid electricity consumption more intelligently.

What is the most important economic advantage of a battery storage system?

For most households, the greatest financial benefit still comes from increasing the self-consumption of solar power.

The MARSTEK Venus D helps households to:

• use more self-generated solar power;
• store excess energy;
• draw less electricity from the public grid.

Using dynamic electricity tariffs is an additional way to further improve energy efficiency. The actual benefit depends among other things on electricity prices, consumption behavior, and individual system settings.

The MARSTEK Venus D is a powerful storage solution for households that want to use their solar energy more efficiently and optimize their energy supply long-term.

Compared to compact balcony power plant storage systems, the Venus D offers more power, greater expansion options, and intelligent control for different energy requirements.

The key advantages of the MARSTEK Venus D:

Use more solar energy

With a PV input power of up to 4,000 W and 4 MPPT technology, the Venus D can efficiently process solar energy from different module configurations and increase self-consumption.

Flexible storage capacity for future requirements

Thanks to its modular design, the storage capacity can be flexibly expanded:

• Starting capacity: 2.56 kWh
• Expandable up to 15.36 kWh

This allows the storage to be adapted to increasing electricity consumption, larger PV systems, or changing energy requirements.

Powerful energy supply in the household

With a maximum bidirectional AC power of 2,500 W, the Venus D is also suitable for households with higher energy requirements and supports the intelligent use of stored solar energy.

Intelligent energy management with MARSTEK AI

MARSTEK AI supports the optimization of charging and discharging processes so that solar energy can be used more efficiently and grid electricity consumption reduced.

Additional security through the backup function

The integrated backup function enables the supply of essential loads during power outages and offers additional security in everyday life.

Who is the Venus D particularly suitable for?

The MARSTEK Venus D is particularly suitable for users who want to go beyond a simple balcony power plant solution and are looking for a flexible, expandable storage solution for their home.

It is a suitable choice for households that:

• want to use more of their own solar power;
• want to reduce energy costs long-term;
• want to expand their PV system;
• strive for more independence from rising electricity prices.

With high PV power, modular expandability, and intelligent energy management, the MARSTEK Venus D offers a future-proof solution for modern household energy.