[rames14]

Think of trickle charges as somewhere around 5 amps. If you have a residential fridge, you may be drawing about 3 amps AC/hour. But, to get DC to AC, you go through an inverter. Ohms law is watts=ampsxvolts. So, your fridge is 3 x 120 = 360 watts. 360 watts / 12 volts = 30 amps on the battery side. So (let’s forget all the things running other than the fridge like CO detector), you are using 30 amps per hour and charging 5 amps. If you have two traditional 12v deep cycle batteries, they are typically 88 amps, of which you can use 50% each without damaging the battery. So, you have 88 usable amps. This is generalization. Fridge usage will depend on outside temp, exact fridge you have, settings, etc. owning an RV is a learning curve. Hope this helps.