Lead batteries have a temperature coefficient of approx. -3 mV per °C and cell during standby parallel operation. The final charging voltage is selected to ensure charging of the batteries in a temperature range of 15-45°C. In applications with frequent and strong temperature fluctuations, the charging voltage should be adjusted accordingly to avoid battery overcharging (risk of gassing!). Likewise, especially at very low ambient temperatures (Tu < 15°C), tracking should be carried out to ensure sufficient battery charging.

By connecting the temperature sensor to terminal strip 'IO-1' connection 1 and 2, the temperature tracking is automatically activated. According to the ambient temperature fluctuations of 0-45°C, the charging end voltage (and thus also the output voltage) varies in a range of 27.85 - 26.3 V DC. Battery temperatures above 45°C are indicated by the 'Batt OK' LED going out.