5
Charging
Many types of lead acid chargers are compatible with our U1LiFePRO™ batteries and safely
charge between 0°C to 55°C (32°F to 131°F). The charger maximum voltage output should match
the maximum charge voltage of the battery system and should not exceed constant voltage as
shown in the table below. It is recommended to charge the battery prior to installation. Consult
with Inventus Power for recommendation on selecting a battery charger.
Charge Voltage / Current
Pin Definition
Pin Definition (M-12V40-U1)
Pin Definition (M-24V20-U1)
Model
M-12V40-U1
M-24V20-U1
Charge Voltage
14.4 VDC
28.0 VDC
Recommended Charge Current
20A (0.5C)
10A (0.5C)
Maximum Charge Current
40A (1.0C)
20A (1.0C)
Pin #
Symbol
Description
1
SMBUS
SMBDAT; leave floating when using CAN
2
SMBUS
SMBCLK; leave floating when using CAN
3
not used
4
VINTLK
For charging, connect VGND to VINTLK
5
VWAKE
For discharging, connect VGND to VWAKE
6
VGND
Ground Reference
7
VCANH_BATT
CAN High (Battery)
8
VCANL_BATT
CAN Low (Battery)
Pin #
Symbol
Description
1
A-RS485
RS485 Data A; leave floating when using CAN
2
B-RS485
RS485 Data B; leave floating when using CAN
3
not used
4
VINTLK
For charging, connect VGND to VINTLK
5
VWAKE
For discharging, connect VGND to VWAKE
6
VGND
Ground reference
7
VCANH_BATT
CAN High (Battery)
8
VCANL_BATT
CAN Low (Battery)
Power and Communication Cables
Power cables are not included with the battery unless a integration kit is purchased. Choose the
appropriate power cable size based on the system load requirements. Refer to ampacity table
in User Manual when selecting power cables. If your application requires communication, please
use any off-the-shelf cable that is compatible with RIA Connector P/N: AJT3518821-030.
