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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 03-06-2012
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Question Battery Chargers

I just have a question that I hope can be answered. It deals with on board battery charging? I have a three bank charger that is rated at 40 amps. If the boat is setup for 30 amp shore power will this blow my main circuit or just charge at a maximum of 30 amps. The charge is automatic from deep charge to battery maintenance with several steps in between.
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Old 03-06-2012
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Re: Battery Chargers

Quote:
Originally Posted by willysail View Post
I just have a question that I hope can be answered. It deals with on board battery charging? I have a three bank charger that is rated at 40 amps. If the boat is setup for 30 amp shore power will this blow my main circuit or just charge at a maximum of 30 amps. The charge is automatic from deep charge to battery maintenance with several steps in between.

No it will not blow anything provided the AC branch breaker is sufficient. It should be able to run off a standard 15A breaker and 14GA wire on the AC side.

It is 40A DC at 14.4V +/-. It probably takes about 6-8.5A +/- AC at full bore...

40A X 14.4V = 576 Watts +/- about 10-20% efficiency loss

30A X 120V = 3600 Watts available to supply the roughly 600 Watts +/-..
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Old 03-06-2012
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Talking Re: Battery Chargers

I know I could count on you to answer the question. That makes me feel a lot better Thanks again !!!!!!!!
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Old 03-07-2012
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Re: Battery Chargers

Just reading that made my brain hurt. I need to do some homework on electrical stuff....
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Old 03-07-2012
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Re: Battery Chargers

A slightly related question: I have a single, large house battery (900 AH) and a 12 V starter battery; I keep the starter battery charged with a VCR (voltage controlled relay). I am looking for an AC powered charger in the range of 40 to 80 A at 12 VDC; all of the chargers I see advertise as having three output ports - I only want 1 output port as I have all of the charging sources going to the house battery bank. Am I missing something or is it accepted to waste 2/3 of the charger and run it unbalanced?
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Old 03-07-2012
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Re: Battery Chargers

You're not wasting amps by only using one output. On a typical 40 amp charger it has a total of 40 amps shared by the outputs. If you only wire one output it will get the full 40 amps.

Curious, what battery do you have?
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Old 03-07-2012
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Re: Battery Chargers

Bunch of Costco 6V lead-acid golf cart batteries (225 AH/).
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Old 03-07-2012
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Re: Battery Chargers

Oh, 8 golf cart batteries - from your wording I thought you meant one battery.
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