Marstek Venus E Gen 3.0 AC coupled energy storage system
Free shipping
Free shipping
We deliver directly to your home free of charge.*
Delivery usually takes 7-14 working days*, so just sit back and relax.
*More information can be found in the shipping terms and conditions .
14-day money-back guarantee
14-day money-back guarantee
We guarantee a 14-day return policy. This means that, regardless of the reason, you can cancel your order within 14 days. As soon as we receive your return in its undamaged original packaging, we will process your refund immediately.
Please note that any costs incurred during a return or refund – such as PayPal's 2% transaction fee and return shipping costs – will be retained as a fee. This fee covers payment and processing costs.
*For more information on the conditions for a successful refund process, please see our refund policy .
10-year warranty
10-year warranty
Marstek.de offers a 10-year warranty. Should the product fail within this period due to material or manufacturing defects, we will provide a replacement. The replacement product will be covered for the remaining warranty period of the original item.
To make a warranty claim, please contact our customer service at: support@marstekenergy.com .
*Further details can be found in our warranty conditions.
Online customer service
Online customer service
We're happy to help! If you have any questions or suggestions, please write to us at support@marstek.de – our team will take care of your request immediately.
Pay conveniently
Pay conveniently
Reliable delivery
Reliable delivery
Powerful performance and absolute reliability
Powerful AC performance for your everyday life
Operate your refrigerator, microwave, and more simultaneously. With 2500 W of continuous power, the system delivers stable energy for your entire household – without compromise.
Scalable, customized performance
Connect up to three devices in single-phase operation for 7.5 kW of power and 15.36 kWh of capacity. A flexible solution that grows precisely with your needs.
*Note: The upgrade depends on the capacity of your home's electrical connection. Please consult a certified electrician.
Stable real-time communication
Use the dedicated LAN port for maximum stability. Compared to Wi-Fi, you benefit from faster response times and interference-free transmission, even in complex environments.
Powerful AC performance for your everyday life
Operate your refrigerator, microwave, and more simultaneously. With 2500 W of continuous power, the system delivers stable energy for your entire household – without compromise.
Scalable, customized performance
Connect up to three devices in single-phase operation for 7.5 kW of power and 15.36 kWh of capacity. A flexible solution that grows precisely with your needs.
*Note: The upgrade depends on the capacity of your home's electrical connection. Please consult a certified electrician.
Stable real-time communication
Use the dedicated LAN port for maximum stability. Compared to Wi-Fi, you benefit from faster response times and interference-free transmission, even in complex environments.
Intelligent, quiet and durable device
Open API for EMS integration
Venus E Gen 3.0 supports the Open API for EMS platforms such as Home Assistant and ioBroker – for flexible automation, individual control and full data control.
Whisper-quiet operation — Below 30 dB
Venus-E Gen 3.0 operates exceptionally quietly and blends seamlessly into your surroundings to provide you with a pleasant experience without disturbing noises.
Long-lasting battery with a 10-year warranty
The Venus E Gen 3.0 with modern LFP battery delivers over 6,000 deep cycles at 80% capacity – for up to 15 years of reliable operation, secured by a 10-year warranty.
Tech Specs
Note 1: The nominal voltage/frequency range may be changed according to the requirements of the local energy supply authority.
Note 2: Please refer to local electrical regulations to determine the number of MARSTEK VENUS units that
can be connected to any branch circuit.
*Activating this function must comply with local regulations and should only be performed by authorized personnel!
Included in the scope of delivery
Marstek Venus-E Gen 3.0
AC cable
Warranty card
Fasteners
Listen to what they say
Disclaimer:
Venus E Gen 3.0 Basics : Nominal capacity 5.12 kWh (90% depth of discharge), 93% charge/discharge efficiency, 2 daily cycles, 365 operating days/year.
Tariffs : Nighttime electricity €0.16/kWh, peak load yield (avoided costs) €0.51/kWh.
Core calculations :
- Effective capacity per cycle: 5.12 kWh × 90% = 4.61 kWh
Actual energy output (discharge): 4.61 kWh × 93% ≈ 4.29 kWh
Energy required for charging: 4.61 kWh ÷ 93% ≈ 4.96 kWh
Yield per cycle :
Day 1 (PV charging, 13:00–17:00 → discharging 18:00–21:00): Excluding charging costs, yield 4.29 kWh × €0.51/kWh = €2.19
2nd night (nighttime charging, 23:00–6:00 → discharge 7:00–12:00): Charging costs 4.96 kWh × €0.16/kWh = €0.79, net profit €2.19 – €0.79 = €1.40
Total yield :
Daily cost €3.59 (€2.19 + €1.40), annual cost approximately €1,310 (€3.59 × 365 days).
A notice :
Ideal estimate – actual yield depends on PV output, tariff fluctuations, device performance, etc.
Legal notice (Germany)
To benefit from the simplified exemption rules for plug-and-play solar power systems according to Section 8 Paragraph 5a EEG 2023:
- The installed PV capacity must be < 2000 Wp.
- The apparent power of the inverter must be ≤ 800 VA P.
If your total PV output exceeds 2,000 Wp, additional requirements may be imposed by the grid operator, e.g.:
a) Registration
b) Obligation to modify the meter
c) Formal approval procedures Please inform yourself about the applicable local regulations before installation.
Plug & Play solar systems can generally be installed independently. However, in Germany, registration in the MaStR portal (www.marktstammdatenregister.de) is mandatory.
Commissioning and grid connection must be carried out by certified professionals. An electrician is legally required to ensure compliance with all regulations.
Ensuring compliance with regulations.
Disclaimer:
Venus E Gen 3.0 Basics : Nominal capacity 5.12 kWh (90% depth of discharge), 93% charge/discharge efficiency, 2 daily cycles, 365 operating days/year.
Tariffs : Nighttime electricity €0.16/kWh, peak load yield (avoided costs) €0.51/kWh.
Core calculations :
- Effective capacity per cycle: 5.12 kWh × 90% = 4.61 kWh
Actual energy output (discharge): 4.61 kWh × 93% ≈ 4.29 kWh
Energy required for charging: 4.61 kWh ÷ 93% ≈ 4.96 kWh
Yield per cycle :
Day 1 (PV charging, 13:00–17:00 → discharging 18:00–21:00): Excluding charging costs, yield 4.29 kWh × €0.51/kWh = €2.19
2nd night (nighttime charging, 23:00–6:00 → discharge 7:00–12:00): Charging costs 4.96 kWh × €0.16/kWh = €0.79, net profit €2.19 – €0.79 = €1.40
Total yield :
Daily cost €3.59 (€2.19 + €1.40), annual cost approximately €1,310 (€3.59 × 365 days).
A notice :
Ideal estimate – actual yield depends on PV output, tariff fluctuations, device performance, etc.
Legal notice (Germany)
To benefit from the simplified exemption rules for plug-and-play solar power systems according to Section 8 Paragraph 5a EEG 2023:
- The installed PV capacity must be < 2000 Wp.
- The apparent power of the inverter must be ≤ 800 VA P.
If your total PV output exceeds 2,000 Wp, additional requirements may be imposed by the grid operator, e.g.:
a) Registration
b) Obligation to modify the meter
c) Formal approval procedures Please inform yourself about the applicable local regulations before installation.
Plug & Play solar systems can generally be installed independently. However, in Germany, registration in the MaStR portal (www.marktstammdatenregister.de) is mandatory.
Commissioning and grid connection must be carried out by certified professionals. An electrician is legally required to ensure compliance with all regulations.
Ensuring compliance with regulations.