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If you are running a 12 volt fridge you probably want a bit more than 120 watt. I have two 130 watt panels on my caravan. You are better off with two smaller panels than one large one (say 250 w) as I have had reports of the larger panels breaking on top of caravans. Apparently they can't flex as the roof moves - so they break. You should also be looking at a dual regulator (such as a Morning Star). This type of regulator lets you adjust battery priority (the percentage of charge the panel supplies to each battery). If it was my set up, I would have one battery only for the fridge and the other battery for everything else. Then I would set my regulator up at 90/10 (90% to the fridge battery and 10% to the other). You can change the percentage regulation as required. It takes a bit of trial and error depending on your set up and 12 volt usage. I have NEVER run out of power - even with a few overcast days. I have not used my generator in years and (if I can find it) I am thinking of selling it.
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