Internal Heating

The HELIOS ESS battery is equipped with internal heating. When the battery’s internal temperature is below 5°C (41°F) and the battery is either connected to a charging source or SOC is 50% or more, energy is diverted to the internal heater to avoid the under-temperature fault.

The heating stops when:

1. The battery’s internal temperature reaches 8°C (46.4°F).

• Once the cell temperature reaches this threshold, all the energy is directed to charging the cells.

2. No charge current is detected and SOC is less than 50%.

• After the heating stops, if the battery’s internal temperature drops below 5°C (41°F) and the battery is connected to a charging source, the heater turns ON again.

For information about internal heating, refer to Protection Specifications and Internal Heating Specifications.