Storage architecture
Designed for availability.
Not pushed to the limit, but built with a reserve: five battery packs, 10 kWh of reserve, a thermally stable cell chemistry.
Five packs, each protected on its own.
Five battery packs work in parallel, each with its own battery management and its own protection.
Each pack monitors its own voltage, current and temperature and shuts down safely if a fault occurs.
- 5 battery packs in parallel
- battery management per pack
Do not use it all up today.
80 kWh of cell capacity is installed, 70 kWh is released for use. The additional 10 kWh are not released in operation.
A LiFePO4 battery lasts longest when it is never fully charged and never fully drained. That is easy on the cells and provides a reserve against their natural ageing. So the 10 kWh are not a loss, but deliberate design.
- 80 kWh installed
- 70 kWh usable
5 + 5years’ warranty on the battery
5 + 5 years’ warranty on the battery. 80 kWh are installed, 70 kWh are usable. The reserve is designed for long-term availability.
You will receive the exact warranty terms with the quotation.
Warranty: the 5 + 5 years on the battery are a promotional offer, valid until further notice. For units ordered before the offer is withdrawn, the promised warranty period applies.
You set the minimum state of charge yourself.
The minimum state of charge is separate from this reserve. It determines how much of the 70 usable kWh stays in the storage unit as a backup supply — and it is adjustable.
LiFePO4 for long-term stability.
COR.stor uses lithium iron phosphate cells (LiFePO4) — a thermally stable cell chemistry that is also used in stationary grid storage.
Battery with passive cooling: no fans, no liquid. The inverter has temperature-controlled fans.
- LiFePO₄
- battery passively cooled, no fans
- safety extra-low voltage per pack
Extra-low voltage instead of high voltage.
Each battery pack runs at safety extra-low voltage (SELV) instead of high voltage. That keeps the voltage per pack low and makes installation easier. COR.stor can be expanded modularly.
Grid down. Power on.
If the grid fails, COR.stor typically takes over within 20 milliseconds. The system supports island mode and black start.
It supplies the whole building, up to 15 or 30 kVA — not just a single backup socket. What happens in island mode and how long the storage unit lasts is covered on a page of its own.
- typically 20 ms switchover
- 15 or 30 kVA
- island mode and black start