Modular
Zendure · ZDSF800
Zendure SolarFlow 800
Weight
5.0kg (11.0 lb)
MARSTEK Venus D
MST-HI-2200
MARSTEK Venus D is a modular balcony storage unit with four independent solar inputs. Capacity starts at 2.56 kWh and expands up to 15.36 kWh with up to 6 battery modules.
It charges from the panels and from the grid. An algorithm-based optimization builds charging strategies from consumption, solar generation and real-time electricity price, and also includes self-consumption. In a blackout the emergency function takes over automatically in under 15 milliseconds, from a Schuko socket.
It is dust-tight and protected against water, and works at ambient temperatures from -20 to +60 °C. It must be installed in an upright position.
JouleSpecs Awards
Lowest price range Outlet-sized (up to 1 kWh) · Modular
The lowest list price among the sheets in the Modular category (outlet-sized tier): €599. The next one has a list price of €999. List prices as published by the manufacturers.
How we assign awards →01 · Verified data
Technical specifications
Feed-in limit
800 VA
Round-trip efficiency
Marstek does not state it.
Standby consumption
Marstek does not state it.
| Parameter | Value | Source |
|---|---|---|
| Dimensions | 48 × 38.5 × 13.5 cm (18.9 × 15.2 × 5.3 in) | manufacturer website |
| Weight | 28.0 kg (61.7 lb) | manufacturer website |
| Expandable | Yes | Declared by the brand |
| Maximum expanded capacity | 15.36 kWh | Declared by the brand |
| Feed-in limit | 800 VA | Declared by the brand |
| Maximum solar input | 4000 W | Declared by the brand |
| MPPT trackers | 4 | Declared by the brand |
| Grid charging | Yes | Declared by the brand |
| Maximum charge power | 2.2 kW | Declared by the brand |
| Dynamic tariffs | Built in | Declared by the brand |
| Backup power | UPS | Declared by the brand |
| Backup output | 2200 W | Declared by the brand |
| Switchover time | 15 ms | Declared by the brand |
| Warranty | 10 anni | Declared by the brand |
| Ingress protection | IP65 | Declared by the brand |
| Mounting | Floor standing | Declared by the brand |
| Minimum temperature | -20 °C | Declared by the brand |
| Maximum temperature | 60 °C | Declared by the brand |
| Usable capacity | — | Not declared |
| Nominal capacity | — | Not declared |
| Depth of discharge | — | Not declared |
| Cell chemistry | — | Not declared |
| Cell supplier | — | Not declared |
| Battery voltage | — | Not declared |
| Inverter included | — | Not declared |
| Rated cycles | — | Not declared |
| Capacity at end of cycle life | — | Not declared |
| Guaranteed throughput | — | Not declared |
| Guaranteed remaining capacity | — | Not declared |
| Round-trip efficiency | — | Not declared |
| Standby consumption | — | Not declared |
| Cell heating | — | Not declared |
| Noise level | — | Not declared |
| Works without internet | — | Not declared |
| Local control | — | Not declared |
| Open protocols | — | Not declared |
| Home Assistant integration | — | Not declared |
| Where the data is hosted | — | Not declared |
| Remote updates | — | Not declared |
| App required for setup | — | Not declared |
| Declared standards | — | Not declared |
| Battery passport | — | Not declared |
| Carbon footprint | — | Not declared |
| Recycled content | — | Not declared |
| Official list price | — | Not declared |
Which documents this page rests on
The rest of the data comes from 2 pages on the manufacturer's site, cited row by row in the table above.
A manual or a datasheet counts as a source even when the original file is hosted elsewhere: what matters is the document, not the server. Where that happens, it is stated above.
02 · The numbers
What it really costs
Battery life cycles
3650 cycles
warranty years
- the manufacturer does not state the guaranteed total energy throughput, which for heavy users is often the limit that runs out first
How we worked it out
- warranty years
- 3650
These numbers are calculated, not stated: they have no source to cite, they have a formula you can redo. The price used is the manufacturer's list price, which is stable and the same in every country — not a shop's price on the day.
03 · Summary
Pros and cons
In favour
- It expands from 2.56 to 15.36 kWh with up to 6 battery modules.
- It charges from panels and grid, with optimization based on the real-time electricity price.
- In a blackout the emergency function takes over in under 15 milliseconds, from a Schuko socket.
- 10-year warranty.
Worth knowing
- It must be installed upright, without tilting it or placing it horizontally or upside down: the space has to be chosen accordingly.
- Capacity starts at 2.56 kWh: anyone with high consumption empties it quickly, and going higher takes additional battery modules.
- With 90% depth of discharge, about a tenth of the battery capacity goes unused. source
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Updates to this sheet and Manufacturer Notes
-
Price updated
-
Sheet published Specifications updated: peso