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Strange voltage readings, any explanation?

Ben Nevis

Ben Nevis

Messages
96
Location
East Midlands
Vehicle
T6 Ocean 150
At home on hook up for 36 hours with fridge on 4.
Checked panel 13.2V, -0.2A so assumed fully charged.
Unhooked from mains & checked panel 12.3V, -0.2A but battery shows only 60%.
Started engine & checked panel 14.4v >20amps with generator symbol on.
After 2 minutes stopped engine checked panel 12.4volts and battery shows 70%.
On hookup again for 10min, checked panel 13.2V, -0.2A
Then unhooked 12.8V, -0.2A battery now 100%.

Any explanation for the low 12.3V 60% reading when it should have been fully charged, or does it indicate a fault somewhere that should be reported to the dealer?
 
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