Shore power, small battery charger, genset, inverter.

Christopher Bromley

My SM Pure Magic, hull no. 433, is presently connected to shorepower @ 220V, 60 Hz. During a recent inspection I was asked to operate the Onan genset, but overlooked switching off the small battery charger on the 220V switchboard before running the genset for a few minutes. Everything controlled from the 220V swichboard is working normally except the small battery charger which usually starts off at about 35A. Now the main 220V breaker inside the rotary autopilot compartment trips off immediately if I switch on the small circuit breaker. Resetting this trip and leaving  the small charger off restores 220v & everything else on the 220V switchboard works as before. There is no sign or smell of overheated circuitry, but I think there must be a short circuit somewhere. I'd really appreciate advice on how to troubleshoot this problem or could the small charger be fried beyond repair? The small charger is a Victron Skylla-TG 24 100, if I'm looking at the right unit.
 Another couple of electrical  questions while on the forum: the large charger I only use with the genset. Typically the charger starts at about 80 - 90 A, but soon - within a minute or two - falls to 20- 30 A and tails off at less than 10A even though the battery bank is short of a full charge, perhaps down at 70%. Is there a simple adjustment I can make to the large charger to keep up its output until closer to a full charge or does the charger need a specialist electrician's attention? The large charger has operated in this way for at least a couple of years. It is a Chargemaster 24/40-3.
 Lastly, I'd like to be sure of correctly identifying the 24V to 220V inverter, the one described in the owner's manual as being capable of running the microwave long enough from the 24 V battery bank to make a cup of coffee, after which it shuts down. Where is it in the boat and how do I get the microwave to run off it rather than from shorepower or the genset? 
   Thank you for your advice,
      Chris Bromley

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