Charging Temperature

Due to the chemistry of Lithium-ion cells, these batteries cannot accept high charge current at lower operating temperatures without risking cell damage and permanent loss of capacity. 

Rolls LFP batteries may be safely charged between 0°C to 50°C (32°F to 122°F).  However, wear is accelerated from 0~5°C (32-41°F), charge current should be limited to 0.1C (10% of battery capacity) to prevent degradation. As the cell temperature rises during the charging process, the battery will gradually accept a higher charge current. However, to prevent the BMS from shutting off due to over-temperature protection at very high operating temperatures, the charge current should be limited to ≤0.2C when operating at temperatures from 35°C to 50°C (95°F to 122°F) as noted below.

To maintain optimum performance and durability of Rolls LFP batteries, the following charge current limits should be followed:

Note: Due to the internal chemistry, batteries can be discharged at lower temperatures than they can be charged at. So, at low temperatures between -10°C and 0°C, batteries will be available for discharge but not charge.

If the battery is installed where temperatures vary, it is recommended to limit charge current to allow uninterrupted charging at extreme operating temperatures. Alternatively, the charge current limit may be adjusted seasonally to allow quicker charge times while operating in warmer/colder temperatures.