The answer depends on the converter, the charger and the batteries
Examples:
Converter: Progressive Dynamics 9280
Battery: Pair of Interstate U-220 golf Cart batteries (NOTE: these are six volt so the pair makes ONE 12 volt battery, There are only 12 volt batteries in RVs)
Charger: 40 amp smart charger
The best option in this case is the rig's converter, so plug in and charge up
Example two
Converter: Magnateck 30 amp
Batteries: Interstate U-220 Pair
Charger, the same 40 amp smart charger
RIP the Magnateck out and put in a nice Xantrex True Sine Wave inverter/converter..
But until then .. Use the charger
NOTE: Z in these examples there were TWO differences in the converter
1: The PD 9200 series is a "Smart" charger, 3-stage, the Magnatek is not
2: The 9280 is, in fact, a bit "Big" for the batteries cited (9260 would be better actually 70 amps is suggested but there is no 9270) and the magnatek 30 is kind of small, so the 40 (or 50 or 60) amp marine charger is better
Suggestion: Post make and model of the trailer's converter, and the specifications (Max charger rate, and is it a 3-stage or single stage) on the marine charger.. Then we can advise better
Also the size (Total amp hours) of the batteries,, A U-220 is 232 amp hours, thus a pair of them is also 232.. A group 27 is what, 83 amp hours, so a pair of them is 166 amp hours (Group27 is 12 volt)
Nothin adds excitment like something that is none of your business John is Near Kenwood TS-2000 housed in a 2005 Damon Intruder 377
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