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Old 08-25-2018, 04:46 PM   #1
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Honda EU2200i Battery Charging

Can anyone tell me approx how long it would take a Honda 2200 generator to charge up the 6 volt batteries supplied by ETI, if they are say 50% discharged?
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Old 08-25-2018, 04:58 PM   #2
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Can anyone tell me approx how long it would take a Honda 2200 generator to charge up the 6 volt batteries supplied by ETI, if they are say 50% discharged?
Using what charger?

These Honda generators (but not the Companion versions) have a 12 V DC charging outlet. It has very low output and poor control, and should not be used.

The better way to charge with a generator is to just plug the trailer into the generator's 120 V AC outlet, and let the trailer's built-in converter/charger do its job. Recent Escapes have a WFCO 8955 Power Center, which includes a converter/charger capable of delivering up to 55 amps of current to the 12-volt system. If nothing else is running on 12 volts (lights, fans, refrigerator...) then to put in the required 115 or so amp-hours will take at least two hours. In reality it will take longer because you won't get the whole 55 amps (if you did a fuse or circuit breaker would trip), so perhaps three hours based on constant charging current. It will even be somewhat longer than that because the charging will slow down in the end (and because charging is not perfectly efficient).

This only requires about one-third or less of this particular generator's maximum output. The generator is not the limiting factor.
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Old 08-25-2018, 05:16 PM   #3
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Can anyone tell me approx how long it would take a Honda 2200 generator to charge up the 6 volt batteries supplied by ETI, if they are say 50% discharged?
I assume you intend to use the built in WFCO Converter/Charger in the trailer, and not an external battery charger connected to the generator. If that's the case, the eu2200i will be able to supply enough power to run the charger properly - and it's the preferred method as well. So, in this case, the power source is irrelevant - the WFCO charger is still charging the batteries.

So now the question is, how long does it take to charge Interstate 6V Deep Cycle batteries that are 50% discharged using the WFCO 3-stage charger built in to the trailer? WFCO says the 8955 can charge a "fully discharged battery" in under 3 hours at 13.6 Volts. But, there are alot of variables.

Also note that 50% discharge is often referred to as the maximum amount of discharge you want to allow for flooded deep cycle batteries, because repeated discharges below this level will shorten the battery life.

EDIT: Saw Brian's post right after I posted mine...
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Old 08-25-2018, 05:25 PM   #4
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Thanks guys, that was exactly the info I was looking for. I'm going to install a solar system, but with cloudy weather and shade trees being common up here, and many rv parks having restricted generator hours, was wondering how long I might be disturbing my neighbors if we're boon-docking.
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Old 08-25-2018, 06:27 PM   #5
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Robert brings up an additional (and not generally recommended) possibility, which is to use the generator to power a separate charger. A larger charger could charge the batteries at a higher rate than the built-in WFCO, but higher charging rates are harder on the batteries (and although the generator would be running for a shorter period, it would also be louder). I agree that using the trailer's built-in charger/converter is generally a better idea (and much simpler).
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Old 08-25-2018, 06:38 PM   #6
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I would suggested you do not try to completely charge your batteries via a generator, shoot for something like 90%. As the batteries get closer to full the rate of charge drops down so it's a case of diminishing returns.

I've let my batteries go down to 60% on purpose, the converter/charger took overnight to charge them back to 100%.
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Old 08-25-2018, 09:20 PM   #7
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Originally Posted by Casa Loba View Post
Thanks guys, that was exactly the info I was looking for. I'm going to install a solar system, but with cloudy weather and shade trees being common up here, and many rv parks having restricted generator hours, was wondering how long I might be disturbing my neighbors if we're boon-docking.
Casa Loba, You will be pleasantly surprised how well your solar keeps your batteries charged, even in cloudy, filtered shady conditions
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Old 08-28-2018, 10:31 AM   #8
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I would suggested you do not try to completely charge your batteries via a generator, shoot for something like 90%. As the batteries get closer to full the rate of charge drops down so it's a case of diminishing returns.

I've let my batteries go down to 60% on purpose, the converter/charger took overnight to charge them back to 100%.


I agree with Bob (Padlin). We have 2 Interstate 6 volts that will power us for 3 days (from 100%) with fairly heavy use of the furnace before dropping to about 50%. So we hook up our generator every couple of days then. When we are camping in milder weather (well above freezing) we run the generator maybe every 4th day. But we never try to get back to 100 % unless on shore power. We run the generator for 2-3 hours. Never more.

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Old 08-28-2018, 11:08 AM   #9
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We run the generator for 2-3 hours. Never more. Bob K
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Old 08-28-2018, 08:22 PM   #10
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So based on your comments, looks like we'll be running the generator only occasionally for a couple of hours. If I go with two 160W solar panels and spend the winters in Baja as planned, I may never have to fire up the Honda
Gord
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