12
Expion360 Battery Manual, G24 and G27
Rev 2
07/18/2022
4.2
Charging Options
Shore Power Charging:
Expion360 batteries should be charged by a CC-CV two-stage charger with voltage settings from 14.2 Vdc to 14.6 Vdc.
The rated charge current should never exceed the maximum charge rate of the battery bank. See
for individual charge currents for each model.
Our batteries may be configured as an uninterruptible power supply (UPS) with an inverter charger. Inverter chargers
need to be programmed before a connection is made to shore power. On the inverter charger controller, under the
"Battery Type" menu, choose the “CC-CV” setting in the setup, and set the charge voltage to 14.4 Vdc. The "Custom"
setting on some inverter chargers is not recommended. The additional settings are determined by the design of the
power system and different inverter chargers. Please refer to the inverter charger manual or contact Expion360 support
for more information.
Solar Charging:
Expion360 batteries can be charged from solar power using a solar charge controller. A maximum power-point tracking
(MPPT) charge controller is recommended as it has higher efficiency than a pulse-width modulation (PWM) charge
controller.
Choose a solar charge controller that can be programmed for two-stage charging or one with a lithium battery setting. If
using a programmable solar charge controller, set the charge voltage from 14.2 Vdc to 14.6 Vdc (14.4 Vdc preferred).
To prevent the solar charge controller from charging the battery bank below 32°F, install a disconnect switch between
the solar panels and the solar charge controller. Make sure the switch is sized to handle the voltage and maximum
current of the solar array. Some solar charge controllers have a temperature sensor and can be programmed to stop
charging at a specific temperature. It is advised to set this temperature to 32°F. Please refer to the solar charge controller
manual or contact the Expion360 support department for more assistance.
Alternator Charging:
The Expion360 battery can be charged from an alternator using any DC/DC charger equipped with settings for LiFePO
4
batteries. The Expion360 DC/DC charger is a CC-CV two-stage charger that is designed only to charge LiFePO
4
batteries
with a 25 A output current. The Expion360 DC/DC charger is simple to install and compatible with any other LiFePO
4
battery. Within the limits of the battery bank and alternator specifications, up to two Expion360 DC/DC chargers can be
used in parallel to achieve a higher charge rate.
Battery Balancer:
For series-connected battery banks of 24, 36, or 48 Vdc, an external battery balancer is recommended to maintain the
balance of charge between all series-connected batteries.
