Can you provide the make/model of the fridge, is there a sticker with power requirements and possibly an efficiency sticker which will show annual operating cost and power consumption.
You might need 2 deep cycle batteries but can probably get by with a 1000 watt inverter (unless already installed). Driving you should be fine but it would help to know your alternator size (amps). Overnight might be the issue. It will help to keep the fridge full and if possible use freezer packs to transfer to fridge at night.
I installed a residential in my coach, I have 4 deep cycle batteries, I can go ~8 hours.
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Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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