Charging? From Gen? - Dutchmen Owners

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Old 12-31-2019, 11:37 PM   #1
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Charging? From Gen?

Hi All - it sure seems like Iím not getting nearly the charge out of my onan 5500 generator that I should be. Seems like we are needing to run the gen way too much. Got huge batteries, lots of solar, shore charge ok, but not enough charge from running the gen. Did anyone add a charger? And how is shore power better than 120v from the onan? Both go thru the stock converter..
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Old 01-01-2020, 12:39 AM   #2
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The Generator does not have a charging system. When the generator runs, the converter charges the batteries. If you have the battery disconnect turned on it will not charge the batteries. Typically the generator is connected directly to the battery. If the disconnect is on and you run the generator it will not charge the batteries because the converter is disconnected from the batteries.
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Old 01-01-2020, 12:49 AM   #3
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Charger? Like this?

Quote:
Originally Posted by VCToyhauler View Post
Hi All - it sure seems like Iím not getting nearly the charge out of my onan 5500 generator that I should be. Seems like we are needing to run the gen way too much. Got huge batteries, lots of solar, shore charge ok, but not enough charge from running the gen. Did anyone add a charger? And how is shore power better than 120v from the onan? Both go thru the stock converter..
ó Does this call for one of these?
Xantrex 804-1240-02 Truecharge2 12V 40A 3 Bank Parallel Stackable Battery Charger https://www.amazon.com/dp/B004VBGUNU..._nW-cEb4T7033P
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Old 01-01-2020, 01:03 AM   #4
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The converter you have is either a 90 or 100 amp 3 stage charger. What ever you have for a battery bank the stock converter should be able to handle it.
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Old 01-01-2020, 10:16 PM   #5
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You didn't change to lithium ion batteries did you? That requires changes to settings on some inverters, others you have to change inverters because they are not lithium ion capable.
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Old 01-02-2020, 12:53 AM   #6
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You didn't change to lithium ion batteries did you? That requires changes to settings on some inverters, others you have to change inverters because they are not lithium ion capable.
I had just upgraded from 3 x 12v to 4 x 6v, upgrading from about 200 to 400AH total. Started with a good shore charge; cloudy days while camping prevented good solar recharge, so I had to run gen a lot. But even after 4-5 hours gen, voltage was not back as high as it seemed it should have been, if it was really doing a full 1st stage bulk charge.
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Old 01-02-2020, 05:29 PM   #7
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4-5 hours of generator time won't be enough time to fully charge depleted batteries. But it should be enough time to get you well on your way, like maybe 90% SOC or something. It's that last 10% that takes hours and hours of charge time since you're in the absorption phase where current is tapering off.
My experience has been that the stock converter would quickly if not immediately get up to the bulk charge setpoint. Granted, I'm only at 2x6V batteries rather than 4 and my WFCO converter really only charges at 13.6V anyway. That's the voltage it immediately jumps to when plugged into shore power or generator.
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Old 01-03-2020, 04:58 AM   #8
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I contacted bestconverter.com, and will now be replacing my wfco 68100 with a boondocker 12100. They say it manages charges much better
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Old 01-03-2020, 01:31 PM   #9
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I contacted bestconverter.com, and will now be replacing my wfco 68100 with a boondocker 12100. They say it manages charges much better
Sounds like a good upgrade. Maybe you had what I see with my WFCO converter, it only charges at 13.6V instead of the claimed 14.4V. This would mean slow charging from shore/generator power.
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Old 01-04-2020, 03:21 AM   #10
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Exactly. Iíll report back after the upgrade. In the meantime... Anyone need a perfectly good wfco 68100A? 😎
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Old 01-04-2020, 05:09 PM   #11
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"Perfectly good WFCO" lol! I shouldn't bash them too much I guess. They do get the job done, but they don't perform as advertised
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Old 01-16-2020, 01:07 AM   #12
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Done, charging at over 14 volts! Also as it turns out, I had a faulty autoreset breaker coming off the converter, which explains a LOT. Like why it would appear to charge, once the gen starts, then a little click, and then it would recycle over and over again, eventually charging some. But DAMN! NOW itís cooking!
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