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Old 09-17-2019, 01:27 PM   #1
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How long to charge a group 24 w/ Honda eu1000i?

Hi all,

Still wrapping my head around all things electrical. There may be a fault somewhere in my '19 Sport 22FB (battery or converter?) or maybe its just normal and I need to be patient with my very modest little generator.

I am wondering: (approximately) how long should I expect my 1000w generator (Honda eu1000i) to bring my group 24 lead acid deep cycle (I believe it is only a 33 amp hour battery) from ~12.1 (I try to stop using it/charge it here) up to, say, 12.6? (I realize that last bit up to 12.8 might take a long time).

Part of the reason I'm looking for a timeframe is because I know that the factory battery monitor is relatively useless. Until I upgrade that, I am going to have to just run the generator for as long as it "should take" and feel it out from there.
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Old 09-17-2019, 02:04 PM   #2
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So how are you using the generator? Although it has a 12 VDC charging port, you will get much better results using the generator as shore power and letting your converter charge the battery. In this case, it should charge as quickly on the generator as it does on 30A shore power.

In case you don't know how long it takes your shore power to charge the batteries, it will depend on the converter and what other 12V stuff is running. A guess would be something in the vicinity of 2-4 hours. You can do a test by charging for a while, then shutting the generator down, wait about 15-30 minutes with little or no load on the 12V and measure the voltage. You would like to see 12.6 or so.

Al
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Old 09-17-2019, 02:21 PM   #3
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Thanks, Al.
I am using it “as shore power” (i.e. not using the dc output).

I am trying to determine what is the rate-limiting factor here...is it the output of the generator, the converters ability to charge the battery, or the battery itself?
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Old 09-17-2019, 02:57 PM   #4
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Hi

The converter charger will limit it's current output as the battery charges. A "normal" group 24 battery should be up in the 60 to 80 AH range. If it's cold out (it's in the mid 40's here at 3PM) a voltage of 12.1 V is a battery that is near dead. Figure you need to put at least 40AH into it.

The voltages that matter are the ones measured about an hour after any charging or discharging is done., The battery needs to settle a bit. There is also the issue of the voltage monitor being a bit closer (voltage drop wise) to the charger than the battery. A reading of 13.2V while charging may not mean a whole lot. A voltage below 12.5 while charging generally is not telling you the battery is very well charged.

From "dead" something in the 4 hours range should get you up to usable. A full charge likely is over 12 hours.

Bob
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Old 09-17-2019, 02:58 PM   #5
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And now I am wondering if I might be better off using the AC output to power a “traditional” (Schumaker) battery charger alligator clipped directly on the terminals. I’m not actually trying to use anything 120v.
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Old 09-17-2019, 02:59 PM   #6
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I have 2 group 27 batteries. It takes about 2 hours with a 2000 generator to get to 12.5. (Summer voltages). I suspect that yours will be about the same and that the ability of the battery to accept a charge is the limiting factor. For lead/acid the voltage monitors should give a fairly good indication of the state of charge.

I do not see that the generator is at all the limiting factor in your case. Check the voltage and amp draw when the converter is running and I bet it is fine.
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Old 09-17-2019, 05:21 PM   #7
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When I boost charged my 2017 FC25FB with my generator, my upgraded PD4655 converter needed four hours to complete bulk mode (climbing to from 12.2V to 14.4V) while charging my 230AH bank of golf cart batteries. Based on this, I agree with those who said two to four hours for a pair of Interstate batteries - especially if the converter charges at 14.4V.

BUT, I've never seen my 2018 Globetrotter's WFCO converter charge at 14.4V. I spent a week analyzing it. I have seen what appears to be Bulk charging when I accidentally brought the stock Interstates down to 11.8V with the DC refrigerator while traveling. I saw it below 13.6v, then climb to 13.6V, in what appeared to be a Bulk mode, but then it stayed at 13.6V for days. I did see it at 13.2V, which is its Float voltage, after spending days at 13.6V. With my experience, it appears to Bulk charge until 13.6V, then go into Absorbtion at 13.6V until Amps dwindle, then go to float at 13.2V. That is not very impressive to me and it will not do much to charge my 6V golf cart batteries, which need to get to 14.55V in Bulk, 14.55V Absorbtion, and float at 13.95V. It will work a little better for Interstate Batteries with their lower charging voltage specifications. But at 13.6V, it will take days to put any significant charge into a set of stock Interstate batteries. Not very good for quickly charging with a generator.

I have installed 600W of solar on my 2018 27' Globetrotter. I hope to never have to charge my 6V golf cart batteries with the WFCO, especially with a generator. If I planned to boost charge with a generator frequently (even occasionally), I'd replace the stock converter with something that could actually boost charge at 14.4V.
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Old 09-17-2019, 06:38 PM   #8
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A 1000 watt generator is basically the same as shore power, regarding the specific limited function of only charging the batteries.

How long does it take for your converter, on shore power, to charge the batteries from 12.1 volts to 12.7? [measured an hour after unplugging from shore power]

I have never tracked this, but I would guess at least 36 to 48 hours with the standard charger/converter IMO.

Peter
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Old 09-17-2019, 07:34 PM   #9
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Wow. All interesting stuff. Lots to take in and absorb. I guess I need to figure out my long term plan do that I don’t end up with incompatible (or sub-optimal anyway) components.

By the way I checked the current flow with my kill a watt and it’s been steadily flowing at about 1.5 amps. That’s with modest load (lights, furnace , water pump, propane-mode fridge).
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Old 09-18-2019, 10:01 AM   #10
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Quote:
Originally Posted by doughpat View Post
And now I am wondering if I might be better off using the AC output to power a “traditional” (Schumaker) battery charger alligator clipped directly on the terminals. I’m not actually trying to use anything 120v.
Hi

The Schumaker chargers are a terrific way to destroy your batteries. Virtually all of them take the batteries to crazy high voltages. That's Wonderful for a battery at the end of it's life. For anything else it is very likely to boil the battery dry.

The bottom line is that charging a lead acid battery properly (so it is not damaged) takes a long time. That's just the way they work. Treat them right and they will last a long time. Abuse them and they will die an early death.

Bob
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Old 09-18-2019, 02:33 PM   #11
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Well said, Bob.

DP -- Just plug the trailer into the generator's 120-volt output [with proper plugs/adaptors], and avoid energy losses with other "solutions" like a battery charger.

Simple!

Peter
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Old 09-19-2019, 03:11 AM   #12
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A new related thread FYI:

http://www.airforums.com/forums/f449...ty-201010.html

FYI/FWIW
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Old 09-20-2019, 11:37 PM   #13
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Good to know—thank you.
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Old 09-21-2019, 04:54 AM   #14
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That link is to your other thread, where there are quite a few good suggestions IMO.

Peter
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