I installed a Xantrex Truecharge 20+ on the weekend. I have a Trojan group 24 deep cycle and a starting battery
I used #10 wire for the DC wiring
and #14 for the AC as per the manual. I fused the positive DC circuits with two 25A fuses
(one for each battery) and the AC with a 15A breaker as per the manual. Settings set to warm temperature, flooded batteries and three stage charge.
Plugged in the charger
and all seemed exactly normal, just as it was when I connected it at home using the same configuration.
We went sailing yesterday and when I returned to the dock
and plugged in my shore power
again, I checked the lights & fuses
and noticed that one of the 25A DC fuses was blown. The fuse on the house battery
What could have caused this to occur?
The only thing I can think of is that I started the engine
with the battery switch in the "Starting" position and the shorepower was still connected, therefore the charger
suddenly had to produce more than 25A. How it might have done this I am not sure.
Or did I backfeed more than 25A when the alternator
started putting out its rated 35A, so the fuse blew to protect the charger?