A solar panel without a connection to a battery (i.e., no load) will put out upwards of 18 to 20 some odd volts. Perhaps, when you are plugged in a relay or circuit is disconnecting the solar panel from the batteries. This would prevent any back feed into the solar panel/s.
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Bob 2006 Monaco Camelot 40PDQ
US Navy Carrier Battlegroup 1959/1965
Winters in Florida, Summers in Blue Ridge Mountains
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