ALPHA Electro
www.pipistrel-aircraft.com
REV. 0
POH-167-00-40-150
Energy storage & charging
Description: 2 metal battery boxes(packs) which include cells,
BMS and communication modules,
power and signal connectors
Total battery capacity: 21.0 kWh
Useful battery capacity: 20.0 kWh
CAUTION! In order to maintain battery life, discharging the battery below 20% charge is not
recommended. The useful range is considered to be between 20%-100% of system charge.
CAUTION! Once the batteries reach 0% SOC, they will be disconnected from the system. The
12v battery supplying avionics and auxiliary systems will still be available.
The batteries are housed in 2 metal boxes(packs), which contain the battery cells, the BMS and com-
munication modules, as well as the power and signal connectors. One of the packs is positioned fire-
wall forward, while the other is aft of the cabin bulkhead. Be sure to always position the pack in the
same location, as they’re not interchangeable. Make sure that all the connectors (2x power connec-
tors, 2x CAN BUS connector, one of each per pack) are fastened properly before each flight, as indicat-
ed in the EPSI570.
NOTE State of health (SOH): SOH is a measure of usable energy in the batteries. It’s related to
battery age, temperature and how properly the batteries have been used.
NOTE State of charge (SOC): SOC is an indication of the current charge level given the batter-
ies current capability, which depends on SOH
Battery management system (BMS)
Each of the battery packs has an independent BMS, which monitors and balances the system’s volt-
age. All the units communicate with the EPSI570 and log data from each individual battery cell. If an
error occurs, EPSI570 will display a message (error code). Contact the manufacturer if this happens.
Under normal circumstances the BMS requires no human intervention and is a fully automated sys-
tem that takes care of itself.
Battery system PB345V105E-A
Maximum voltage 398 V
Minimum voltage 288 V
Recommended voltage range for storage 355 V - 365 V
Maximum operating temperature 55 °C
Minimum operating temperature 5 °C
Allowable temperature range for storage 10 °C - 40 °C
Minimum charging temperature 0 °C
CAUTION! Temperatures below 10°C will cause a decrease in battery capacity. Plan your
flight accordingly.
WARNING! Do not, under any circumstances, attempt to charge the batteries with any third
party chargers. Only Pipistrel original equipment must be used.
WARNING! Respect operating and storage temperatures and storage limits at all times.
Failure to do so may rsult in battery damage.
Aircraft & systems
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