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Old 07-21-2014, 09:00 PM   #1
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Default battery charger amps spiking while running off generator

as the title says, I noticed that the charging amps while running the charger off of the gen to recharge batts was spiking fron lets say 12amps to 25amps. it does this every 3 seconds or so....it doesn't keep a steady flow like when its running off shore power. anyone know what might be the problem if that is indeed a problem(I assume it is tho). charger is a promatic 30-3, gen set is kohler model 5e 3600rpm. I just purchased the boat 1 month ago.
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Old 07-21-2014, 10:02 PM   #2
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Welcome aboard.

If the charger is steady when on dock power and this only happens when the genny is on I would suspect that the genny's output is not clean 120 VAC.
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Old 07-22-2014, 01:10 PM   #3
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Originally Posted by mmwjr View Post
Welcome aboard.

If the charger is steady when on dock power and this only happens when the genny is on I would suspect that the genny's output is not clean 120 VAC.
yea that's what I seem to be getting....sine wave not steady. the gen runs everything on the boat just fine, only thing that seems to be having a problem is the charger. wonder if a newer charger would fix that or if there is something that could be done to the generator to get a steady power flow
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Old 07-22-2014, 05:19 PM   #4
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I would have the generator's output checked first as it may have an internal issue. Most other loads are not that sensitive to an unclean sine wave.
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Old 07-22-2014, 09:38 PM   #5
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I'd have the genny serviced first. Frequently, they'll hack the output by raising the idle screw. This is not how to tune a genny. They are often way off. Then talk to your certified Kohler Service rep about what you're seeing. It sounds like the genny is 'hunting' a bit. The genny should ramp up/down based on load. The charger will ramp up/down based on available amps. They sound like they're both being very polite to one another.
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Old 08-09-2014, 04:31 PM   #6
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quick update, figured out that putting load on the gen, like running the a/c, will make the charger work properly. needle stays steady just like it should.
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