Re the signs; I believe fully charged because the solar panel regulator has coloured lights which state chharge level, & whether regulator working - ie stopping further charging, also the voltmeter on running the engingine quickly up to 14V level.
The invertor (1.5KW) only running the CD player then a laptop to watch a film.
This occurred over Friday night through to Sunday morning, perhaps 36 hours or so.
I am a bit worried the clamp ammeter is showing only 25 amps, when the 90 amp alternator was charging very flat batteries.
Should have also mentioned I have concerns the fridge thermostat is out, so at lowest setting the fridge is still too cold, perhaps running far more thsn usual so draining the batteries more.
Surely no batteries should be discharged to 0.00Volts and still be usable?