Hi my son has a 12 volt fridge on his narrowboat. He is having to charge his batteries via a jenny, problems occur when he has used his 12 volt system for a while, his fridge goes into limp mode. He has taken a reading off his batteries and that gave him 12.6 volts, but at the fridge end he only got 10.7. Is this due to the cables being too narrow. When he charges up via his engine it take longer to go into limp mode, also when he was on mains hook up at a previous mooring, he never had a problem. His fridge is a Danfoss. Any help would be appreciated.