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Catalina 34 > General Activities > Main Message Board > Topic: 10 amp breaker for 20 amp charger?
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Author Topic: 10 amp breaker for 20 amp charger?  (Read 727 times)
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Sundance
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Boat Name / Hull Number: Sundance / #844
Model Year: 1989
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« on: October 01, 2007, 08:34:45 AM »
I have a 1989, but I am looking at the 2004 Manual for wiring upgrade info, more specifically the 12V wiring diagram, it shows the 20 amp charger comming from a 10 amp breaker at the panel.  I am looking to revise my wiring to place a dedicated breaker for my 20 amp charger, but it seems to me I would want a 20 amp breaker.  It seems to me I could never "max out" my charger (good or bad) meaning I would trip the breaker at the panel, before I could get the full potential out of the charger.  Is this correct?  Any input would be helpful.
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Jeff
1989 C34 #844
"Sundance"
Sandusky, OH
Craig Illman
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« Reply #1 on: October 01, 2007, 09:31:39 AM »
It would be a lot less confusing if the chargers were rated in watts, instead of amps. 12v X 20A = 240 Watts.  Assuming maybe 70% efficiency, 240 Watts divided by 120 volts divided by .7 equals less than 3 amps. Your ten amp breaker should be fine. Check the specs for your charger on the manufacturer's website, if you don't have the manual aboard.

Craig
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Zodiac C-260
Sundance
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« Reply #2 on: October 01, 2007, 09:44:02 AM »
Makes sence when you explain it that way.  Thanks.
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Jeff
1989 C34 #844
"Sundance"
Sandusky, OH
Ted Pounds
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« Reply #3 on: October 01, 2007, 08:51:49 PM »
Craig is right.  If you're asking about the AC breaker for power going to the charger 10 amp is perfect.  The output has it's owm internal fuse.
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Ted Pounds
"Molly Rose"
1987 #447
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