Marstek Venus C 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 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
| Balcony power plant | Balcony power plant with storage | Balcony power plant with Venus | |
|---|---|---|---|
| On-grid output | Yes | Yes | Yes |
| Off-grid exit | No | No | Yes |
| Power supply at night | No | Yes | Yes |
| Power supply during outages | No | No | Yes |
| Peak shaving and valley filling | No | No | Yes |
| Zero feed-in via smart meter | No | Yes | Yes |
| General | |
|---|---|
| Model | Venus-C |
| Dimensions | 450×550×200mm |
| Weight | 45 ± 0.5kg |
| Operating temperature | -20°C ~ +55°C (Storage: -30°C ~ +85°C) |
| Protection class | IP65 |
| Surge/Voltage Resistance | DC II / AC III |
| Isolated Type | Insulated |
| Cooling strategy | Natural convection |
| Max. Operating Height | 2000m |
| Relative humidity | 0–95% |
| On-Grid Connection Standard | VDE 4105/0124, TOR R25, NF EN50549-1, UNE217001/217002, NTS 631, CEI 0-21, PETREE, PN-EN 50549-1/-2, G98, AS4777.2 |
| Regulation / EMC | IEC62040, IEC62477, IEC/EN 61000-6-1/-2/-3/-4, IEC/EN 61000-3-2/-3, EN 300 328, EN 301 489-1/-17, EN 50665, CB 62619 |
| Battery info | |
| Capacity | 2560Wh |
| Battery type | LiFePO₄ (Lithium Iron Phosphate) |
| Life cycles | >6000 cycles (25°C) |
| Rated voltage | 51.2V (16S) |
| Max. battery AC efficiency | >93.5% |
| AC input/output (On Grid) | |
| Rated input power | 2.5kW |
| Rated output power | 2.5kW / 800W |
| Phase operation | L / N / PE |
| Nominal grid voltage | 230V |
| Mains voltage range | 187V–253V |
| Nominal frequency | 50Hz |
| Nominal output current | 10.9A |
| Power Factor | > 0.99 (Standard), adjustable 0.8 leading ~ 0.8 lagging |
| THDi | < 3% |
| Back-up (Off Grid) | |
| Nominal output power | 2.5kW |
| Max. apparent output power | 3.5kVA, 10A |
| Nominal grid voltage | 230V |
| Nominal output current | 10.9A |
| Nominal frequency output | 50Hz |
| THDu (Linear) | < 3% |
| Additional data | |
| AC mains connection | Three-wire household plug (Euro 16A) |
| Backup connection | Three-hole socket (blue Euro socket) |
| Display | LED |
| Communication interface | WiFi & RS485 (waterproof aviation connector) |
Included in the scope of delivery
Marstek Venus C
AC cable
Warranty card
FAQ
How does the Venus C/E work?
How can you control the input/output of the Venus C/E?
Which smart meters are compatible with the Venus C/E?
What charging methods does the Venus C/E support?
On the other hand, the Venus Energycube can also be charged by connecting to the same phase as the PV system. The maximum charging power is also 2500 W here.
Can the capacity of the Venus C/E be expanded?
Disclaimer:
The estimated electricity cost savings are calculated using the following formula:
1. Venus C as a solar storage system (saves you even more on electricity purchases)
A single Venus C stores up to 2.56 kWh of solar power per day – with four units, you have a storage capacity of 10.24 kWh. That's enough to cover almost the entire daily electricity needs of an average household (e.g., for a refrigerator, washing machine, lighting, and television) with solar power. Assuming 300 sunny days per year and an average electricity price of €0.35 per kWh.
1. Daily stored electricity (4 devices): 2.56 kWh × 4 = 10.24 kWh
2. Annual savings: 10.24 kWh × €0.35/kWh × 300 days ≈ €1,075
2. Venus C in electricity trading (buy cheap, sell expensive – double advantage)
With four Venus C devices, you can charge more electricity at low prices (e.g., €0.20/kWh) and supply correspondingly more during peak periods (e.g., €0.50/kWh) – without any extra effort. Each device only needs about 3.2 hours to discharge, so all four devices can easily complete a full trading cycle within a single day.
1. Daily electricity consumption for retail (4 devices): 2.56 kWh × 4 = 10.24 kWh
2. Annual advantage: (€0.50 – €0.20) × 10.24 kWh × 365 days ≈ €1,138
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 2000 Wp, additional requirements may apply.
the network 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:
The estimated electricity cost savings are calculated using the following formula:
1. Venus C as a solar storage system (saves you even more on electricity purchases)
A single Venus C stores up to 2.56 kWh of solar power per day – with four units, you have a storage capacity of 10.24 kWh. That's enough to cover almost the entire daily electricity needs of an average household (e.g., for a refrigerator, washing machine, lighting, and television) with solar power. Assuming 300 sunny days per year and an average electricity price of €0.35 per kWh.
1. Daily stored electricity (4 devices): 2.56 kWh × 4 = 10.24 kWh
2. Annual savings: 10.24 kWh × €0.35/kWh × 300 days ≈ €1,075
2. Venus C in electricity trading (buy cheap, sell expensive – double advantage)
With four Venus C devices, you can charge more electricity at low prices (e.g., €0.20/kWh) and supply correspondingly more during peak periods (e.g., €0.50/kWh) – without any extra effort. Each device only needs about 3.2 hours to discharge, so all four devices can easily complete a full trading cycle within a single day.
1. Daily electricity consumption for retail (4 devices): 2.56 kWh × 4 = 10.24 kWh
2. Annual advantage: (€0.50 – €0.20) × 10.24 kWh × 365 days ≈ €1,138
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 2000 Wp, additional requirements may apply.
the network 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.