Charging travel trailer’s second battery bank with solar kit

I just want know if I hook up two batteries will they both charge and do I hook the solar to the first battery or second the first is connected to my trailer leads second would be the one I want to link to it

This will depend on the type of charge controller you have and how much solar is on your travel trailer. Charge controllers like the Go Power Bluetooth Solar Controller will handle 2 different battery banks, but it must charge the first battery 100% before starting to charge the second battery. This can be an issue if there is not enough solar power to completely charge the 1st battery bank.

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