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High current draw blows shore power breaker
April 26, 2012
8:21 pm
Iproff
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Forum Posts: 1
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April 26, 2012
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I have 1988 300 Sundancer, boat has always been in fresh water on Lake Simcoe, current temp of water is in the 30's and the air temp is in the 40's. Not very nice boating weather.

Over the winter our marina was rewired new 30 amp service at the slips but rather than put a panel close to the slips there is a 150' run to the slips. Breaker is a 30 amp GFI

Today we launched and I put the boat in our slip, I connected the shore power to the boat and started testing the 120 side. Our marine has never had 30 amp service at the slips before I shared a 120V 15 amp outlet for 6 years.

I turned everything off and then turned the AC on it's a 12000 btu marine air with the 3 knob marine air controls (manual). I turn the first knob to start and the water pump kicks in the amp meter shows very little draw. When I turn the knob to run the AC and the new breaker pops. I try it twice more and notice the amp meter bounces off the pin at the 50 amp reading (this is normal for me to see this). I am tired of the walk up to reset the breaker so I start my generator, let it warm up and turn the ac to run, water pump has great flow as usual and then I turn the knob to run the generator increases rpm's as usual the amp meter bounces off the 50 amp reading and settles down to a 9.5 amp reading on the amp meter. The water is still in the 30's so it takes the unit about 5 minutes to warm up and I have a very nice warm cabin, but I am running my generator again.

Over the last 4 years the AC has always done the same start-up at marinas I have never blown the shore power breaker till today. The marine owns 32 Maxim is in the slip next to me and we try his AC which is a 16,000 btu unit and it starts and runs without blowing the breaker.

The AC documentation that I have says I have a hard start kit, could the capacitor be shot or is this normal for a 1987 AC unit.

Thank you for taking the time to read this.

 

Ken