55 amps will work great for boondocking and charging up to about 4 batteries.
Less than 55 amps, and the generator will need to run more hours to get it charged back up. More than 60 amps (I have a 70 amp charger with 4 golf cart batteries and a 440 AH total capacity) and your charger will never really exceed more than 50 amps output more than a few minutes while the batteries are really low, so it is like having a huge engine in a tiny boat, on a tiny pond, it will really not get you anyplace faster.
My 70 amp charger will start out at around 55 amps but will quickly taper off to only about 45 amps after 30 minutes charging some 50% full Trojan T-105 golf cart batteries.
My suggestion for solar? Get a pair of golf cart batteries and a pair of 140 watt solar panels. More battery is just more weight, and you really no longer need to store more than 36 hours worth of power in the battery once you have a large solar system.
SunElec.com sells a $229 140 watt solar panel with aluminum frame, and 12 volt nominal output (21 volt open circuit). THis can be wired to a low cost PWM controller, and your battery. It will keep the battery full while in storage.
Your loads are about 35 AH daily to run the CO and propane leak detectors, and refrigerator. This is about what one of my 120 watt panels will put out each day.
Good luck,
Fred.
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Porsche or Country Coach!
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