Are the details of the charge control algorithm of the CR6 documented? The manual mentions the relevance of temperature, but is it taken into account? What is the current when the ChargeState is Current Limit?
It uses a temperature adjusted target voltage for the float charger.
Current limited is when the charging source is not able to provide enough current to reach the target voltage. The charger in the datalogger can handle 1.2 amps. If the solar panel provides less current, you would reach current limited at that lower limit.
Is it possible to find out how the target voltage is calculated?
Does the logger actually measure the charging current?
I interpreted the note in the manual to mean that the charging terminals can draw upto 1.2 A. If the supply voltage is 24, then a much higher current could be delivered to the battery--at least if there is a DC/DC converter.
My CR6 is currently showing a battery voltage of 13.2V. It is in float charge mode with an input voltage of 20.2 volts, and the panel temperature is 26.8C. The battery is 24 Ah, sealed lead-acid.
To me this float charge voltage seems much too low. Can I adjust this in any way?
It is a temperature adjusted target voltage. Higher temperatures have lower target charge voltages. We use the recommended temperature coefficient from Yuasa, which manufactures most of our batteries.
You can also see a lower voltage if the battery was discharged and it is currently taking all the current the datalogger can supply.