Cell chemistry
Lithium-ion (NCA)
Cell type
21700 Round cell
Compatible inverters
SMA, Kostal,
Kontron (expected from September 2025) 2
Installation site
Indoor and garage3
1 When taking out the online warranty
2 Details in compatibility list, further compatibilities planned for the future
3 Upright with fixing to the wall. IP 55, see ambient and operating temperature range
Cell format and cell chemistry
21700 round cell / lithium-ion
Security
Highest safety standards according to VDE-AR-E 2510-50:2017-05
Current country authorisation
DE, AT, CH
Protection class
IP 55
Ambient temperature range / operating temperature range
-10 °C to +50 °C / +2 to +42 °C*
Noise emission
< 10 dBA
System warranty
10 years (online warranty)**
Warranty on battery cells
10 years or 4,000 cycles***
Hardware interfaces
CAN, RS485, Ethernet, Wifi
*Achievement of the nominal charging capacity within the optimum operating temperature range +22°C to +33°C
**According to the conditions of the "manufacturer's warranty"
***Expected remaining capacity: 80%
Usable battery capacity
10 / 15 / 20 kWh
Max. charge/discharge current
22 A / 26 A
Nominal charging/discharging power
VARTA.wall 10: 4.4 kW / 5.2 kW*
VARTA.wall 15: 6.7 kW / 7.9 kW*
VARTA.wall 20: 8.9 kW / 10.5 kW*
Weight
87.4 / 124.4 / 161.4 kg
*Achievement of the nominal charging capacity within the optimum operating temperature range +22°C to +33°C.