Photo from the manufacturer
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MARSTEK Jupiter C Plus Erweiterungsakku is the Jupiter C Plus's expansion battery: up to three expansion batteries per system can be added by stacking them, reaching 10.24 kWh in total. Each module has a capacity of 2.56 kWh with lithium iron phosphate (LiFePO4) cells.
It has an IP65 protection rating and works from −20 to +60 °C.
| Parameter | Value | Source |
|---|---|---|
| Dimensions | 48 × 32 × 16.5 cm (18.9 × 12.6 × 6.5 in) | manufacturer website |
| Weight | 22.5 kg (49.6 lb) | manufacturer website |
| Compatible models | MARSTEK Jupiter C Plus All-in-One | Declared by the brand |
| Nominal capacity | 2.56 kWh | Declared by the brand |
| Cell chemistry | LFP (lithium iron phosphate) | Declared by the brand |
| Expandable | Yes | Declared by the brand |
| Rated cycles | 6000 cicli | Declared by the brand |
| Warranty | 10 anni | Declared by the brand |
| Ingress protection | IP65 | Declared by the brand |
| Minimum temperature | -20 °C | Declared by the brand |
| Maximum temperature | 60 °C | Declared by the brand |
| Usable capacity | — | Not declared |
| Depth of discharge | — | Not declared |
| Cell supplier | — | Not declared |
| Maximum expanded capacity | — | Not declared |
| Battery voltage | — | Not declared |
| Feed-in limit | — | Not declared |
| Inverter included | — | Not declared |
| Maximum solar input | — | Not declared |
| MPPT trackers | — | Not declared |
| Grid charging | — | Not declared |
| Maximum charge power | — | Not declared |
| Dynamic tariffs | — | Not declared |
| Backup power | — | Not declared |
| Backup output | — | Not declared |
| Switchover time | — | 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 |
| Mounting | — | 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 |
The rest of the data comes from one page 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.
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.
