My solar panel has two diodes, one bypass diode and one blocking diode.
The blocking diode prevents the battery from discharging back through the solar panel.
Your charge controller should detect when there's no sun and prevent back discharge too.
Battery charging
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Re: Battery charging
'86 1.9 DG, 4 spd, tintop, camper conversion.
Split case club member.
Split case club member.