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
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.
Technical Details
Included in the scope of delivery
Disclaimer:
Venus E Gen 3.0 Fundamentals: Nominal capacity 5.12 kWh (90% depth of discharge), 93% charge/discharge efficiency, 2 daily cycles, 365 operating days/year.
Tariffs: Night rate electricity €0.16/kWh, Peak load yield (avoided costs) €0.51/kWh.
Core Calculations:
- Usable 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 (PV charging, 13:00–17:00 → Discharge 18:00–21:00): No charging costs, yield 4.29 kWh × €0.51/kWh = €2.19
- Night (Night rate 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 €3.59 (€2.19 + €1.40), annually approx. €1,310 (€3.59 × 365 days).
Note:
Ideal estimation – actual yield depends on PV output, tariff fluctuations, device performance, etc.
Legal Notices (Germany)
To benefit from the simplified regulations for plug-in generation systems according to § 8 para. 5a EEG, the following limits apply:
- The total installed PV capacity must not exceed 2,000 Wp.
- The inverter apparent power must be ≤ 800 VA.
If your system exceeds these limits, the regular requirements of the grid operator apply. This may include, among other things, extended registration, a meter modification, or formal approval procedures. Please inform yourself about the locally applicable regulations before installation.
Registration & Installation:
Plug & Play solar systems can generally be installed and connected independently in Germany. Registration in the Market Master Data Register (MaStR) is legally mandatory (www.marktstammdatenregister.de). Registration with the grid operator has been significantly simplified or partially automated by Solar Package I.
Disclaimer:
Venus E Gen 3.0 Fundamentals: Nominal capacity 5.12 kWh (90% depth of discharge), 93% charge/discharge efficiency, 2 daily cycles, 365 operating days/year.
Tariffs: Night rate electricity €0.16/kWh, Peak load yield (avoided costs) €0.51/kWh.
Core Calculations:
- Usable 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 (PV charging, 13:00–17:00 → Discharge 18:00–21:00): No charging costs, yield 4.29 kWh × €0.51/kWh = €2.19
- Night (Night rate 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 €3.59 (€2.19 + €1.40), annually approx. €1,310 (€3.59 × 365 days).
Note:
Ideal estimation – actual yield depends on PV output, tariff fluctuations, device performance, etc.
Legal Notices (Germany)
To benefit from the simplified regulations for plug-in generation systems according to § 8 para. 5a EEG, the following limits apply:
- The total installed PV capacity must not exceed 2,000 Wp.
- The inverter apparent power must be ≤ 800 VA.
If your system exceeds these limits, the regular requirements of the grid operator apply. This may include, among other things, extended registration, a meter modification, or formal approval procedures. Please inform yourself about the locally applicable regulations before installation.
Registration & Installation:
Plug & Play solar systems can generally be installed and connected independently in Germany. Registration in the Market Master Data Register (MaStR) is legally mandatory (www.marktstammdatenregister.de). Registration with the grid operator has been significantly simplified or partially automated by Solar Package I.