I have an RV and want to trickle charge the chassis battery from my solar supported house lithium battery. I have an Orion-Tr 12/12/9 which doesn’t appear to have Bluetooth to program it nor an multistatge charging program, only an adjustable resistor to set the output voltage. What would be the best voltage to set it to for float on a lead acid chassis battery? Are there other issues doing this?
I found this which sets voltages based on temperature.
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