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Old 09-20-2017, 08:48 PM   #1
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Generator Newbie-How long to charge?

OK, so I get that there are a lot of factors involved, but how long do YOU run your generator during the day to recharge?

I have a Ryobi 2300/1800w generator charging two 6v GC batteries via the onboard converter. Let's say I wake up to my batteries showing 12.2 (60% charge state.) I have no clue what to expect. 2 hours? All day??

Is there a way to know if I've achieved float mode?
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Old 09-21-2017, 10:16 AM   #2
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you must have a multimeter if you are able to talk about 12.2 volts, so take one day and first thing in the morning measure your batteries (without converter charging) start your generator noting the equipment running and when they reach 100% not the time required. You have answered your question and learned something about your rig under a specific condition. let the forum know what you come up with
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Old 09-21-2017, 11:45 AM   #3
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So...if I run my generator until my batteries read at least 12.6 then I'm "fully charged"?

I thought I had to charge until it's achieved float mode or it will drain down much quicker.

Sorry if this isn't making sense. Like I said, newbie here.
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Old 09-21-2017, 01:10 PM   #4
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If you have a wfco converter, do yourself a favor and get a decent automatic battery charger that you can hook directly to the batteries. You'll be able to maintain the batteries with less generator run-time.
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Old 09-21-2017, 02:27 PM   #5
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I never had any issues recharging my batteries, with the trailer's WFCO and my Honda 2000i, for the 10 years I camped with it.
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Old 09-21-2017, 02:37 PM   #6
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Quick and dirty: find the "battery state of charge by voltage" chart.
Say it reads 12.10 resting, or about 50%. If you have a 100ah battery you need to put 50amps back into the battery. If your converter/charger outputs 25amps, figure two hours. Just adjust the variables to your battery. Easy peasy.
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Old 09-21-2017, 03:25 PM   #7
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I think y'all need to read the 12 volt side of life part 1. There is no way you can charge a battery that is at 50% to 100% in two hours
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Old 09-21-2017, 03:42 PM   #8
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I put an amp probe on my 120v connection to the generator. I then shut off the battery disconnect. If the amp probe reading stays the same then the battery is charge. If the reading decrease your converter is still charging the battery.
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Old 09-21-2017, 03:51 PM   #9
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Quote:
Originally Posted by latner View Post
If you have a wfco converter, do yourself a favor and get a decent automatic battery charger that you can hook directly to the batteries. You'll be able to maintain the batteries with less generator run-time.
Better yet, dump the WFCO converter and replace it with a better converter and skip buying a battery charger that won't have near the charging capacity of a good converter.
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Old 09-21-2017, 03:52 PM   #10
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Quote:
Originally Posted by spock123 View Post
I think y'all need to read the 12 volt side of life part 1. There is no way you can charge a battery that is at 50% to 100% in two hours


Sure you can, with the right charger. The charge time is solely dependent on the charger and the type of battery. There is some internal resistance but the math is simple. In my example above, a 10amp charger will take 2.5 times as long. I have a pretty good 40amp bulk charger that can mostly charge batteries in two hours.
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