On our last trip when plugged into 30 amp shore power the converter would turn on for a few minutes and the interior lights would brighten then go dim once the converter shut off a couple minutes late...
35 or 45 or 55 or 60 amps is fine. DO NOT spend money on a WFCO. Get a Progressive Dynamics or IOTA replacement. Especially if using a generator to recharge. Boondocker is fine for plugged into utility power.
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