High voltage
FoxESS
EQ Battery (EQ4800 / EQ6000 Plus)
SMA Home Storage 6.5
2 x HS-BM-3.28-10
Photo from the manufacturer
High voltage
F3 · Flat-sized (3–8 kWh)
SMA Home Storage 6.5
Price
Not available
JouleSpecs does not sell and does not show shop prices: check the price where you buy.
Data from official source
SMA Home Storage 6.5 combines two lithium iron phosphate modules in a single tower. Paired with the Sunny Boy Smart Energy inverter, it's the system HTW Berlin's Stromspeicher-Inspektion 2026 measured with the highest efficiency among hybrid-inverter storage units in its power class: the figure covers the battery-plus-inverter pairing as a whole, not the battery alone, because that's how this independent test works.
It has no inverter of its own: one of SMA's hybrid inverters from the Smart Energy family is always needed, either the single-phase Sunny Boy Smart Energy or the three-phase Sunny Tripower Smart Energy. It stores solar energy during the day and gives it back according to the management of the connected inverter, which decides when to charge and when to discharge.
01 · Verified data
Technical specifications
Usable capacity
6.56 kWh
Cell chemistry
LFP (lithium iron phosphate)
Round-trip efficiency
94.5 %
Standby consumption
4 W
| Parameter | Value | Source |
|---|---|---|
| Dimensions | 61 × 21.5 × 96.9 cm (24.0 × 8.4 × 38.1 in) | manufacturer website |
| Weight | 76.0 kg (167.6 lb) | manufacturer website |
| Usable capacity | 6.56 kWh | Declared by the brand |
| Depth of discharge | 100 % | Declared by the brand |
| Cell chemistry | LFP (lithium iron phosphate) | Declared by the brand |
| Expandable | Yes | Declared by the brand |
| Maximum expanded capacity | 16.4 kWh | Declared by the brand |
| Battery voltage | 192 V | Declared by the brand |
| Declared compatible inverters | Compatibile con entrambi gli inverter ibridi della gamma Smart Energy di SMA: il monofase Sunny Boy Smart Energy (da 1 a 4 moduli) e il trifase Sunny Tripower Smart Energy (da 2 a 5 moduli). È la prima taglia della gamma che può scegliere fra i due. Non retrofittabile sui vecchi Sunny Boy Storage (SBS2.5-1VL-10, SBS3.7-10-SBS6.0-10) né con inverter di altri marchi. | Declared by the brand |
| Rated cycles | 8000 cicli | Declared by the brand |
| Capacity at end of cycle life | 60 % | Declared by the brand |
| Warranty | 2 anni | Declared by the brand |
| Guaranteed throughput | 47.232 MWh | Declared by the brand |
| Guaranteed remaining capacity | 60 % | Declared by the brand |
| Round-trip efficiency | 94.5 % | Declared by the brand |
| Standby consumption | 4 W | Declared by the brand |
| SPI index (HTW Berlin) | 92.8 % | Declared by the brand |
| HTW test power class | 5 kW class | Declared by the brand |
| HTW test edition | Stromspeicher-Inspektion 2026 | Declared by the brand |
| Ingress protection | IP65 | Declared by the brand |
| Mounting | Wall mounted | Declared by the brand |
| Minimum temperature | -10 °C | Declared by the brand |
| Maximum temperature | 50 °C | Declared by the brand |
| Remote updates | Can be disabled | Declared by the brand |
| Declared standards | CE, UN 38.3, IEC 62619, IEC 62477, VDE 2510-50 | Declared by the brand |
| Nominal capacity | — | Not declared |
| Cell supplier | — | Not declared |
| Continuous output | — | Not applicable |
| Phases | — | Not applicable |
| Maximum charge power | — | Not declared |
| Backup power | — | Not applicable |
| Backup phases | — | Not applicable |
| Switchover time | — | Not applicable |
| Black start | — | Not applicable |
| Grid charging | — | Not applicable |
| Dynamic tariffs | — | Not applicable |
| EV charger integration | — | Not applicable |
| Heat pump integration | — | Not applicable |
| Virtual power plant | — | Not applicable |
| Cell heating | — | Not declared |
| Noise level | — | Not declared |
| Works without internet | — | Not declared |
| Local control | — | Not applicable |
| Open protocols | — | Not applicable |
| App required for setup | — | Not declared |
| Battery passport | — | Not declared |
| Carbon footprint | — | Not declared |
| Recycled content | — | Not declared |
| Grid connection power | — | Not applicable |
| Official list price | — | Not declared |
Which documents this page rests on
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.
02 · The numbers
What it really costs
Battery life cycles
730 cycles
warranty years
How we worked it out
- stated cycles
- 8000
- warranty years
- 730
- guaranteed energy throughput
- 7200
Energy density
86.300 Wh/kg
How we worked it out
- usable capacity
- 6.560
- weight
- 76
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
- Its efficiency was measured by an independent lab, HTW Berlin.
- It pairs with both the single-phase and the three-phase inverter in the Smart Energy range: the choice depends on the home system, not the battery.
- Eight thousand cycles down to 60% residual capacity: the end-of-life threshold is stated.
Worth knowing
- Even at rest it draws something: with two modules that's four watts staying on all year round.
- The full ten years of warranty are only obtained by registering the product within a month of commissioning.
Updates to this sheet and Manufacturer Notes
-
Sheet published Specifications updated: nome