How can I monitor the temperature of my battery during charging?
You can use the optional Battery Temperature Sensor (BTS) Model DC-BTS-A-C for temperature compensation. When connected, the BTS temperature will be displayed on LCD Screen 7 alongside the heatsink temperature. Note that temperatures below 0°C will display as '- - - °C' as the lower limit for temperature compensation is 0°C. (Pages 36, 37)
From the official Upgraded 30A Solar Charge Controller manual, page 36
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