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Old 09-09-2008, 09:22 PM   #15
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So does that mean that the regulator in the less powerful charger will shut down the charge function in that charger? Does that mean that using two charing sources is pointless as only one is actually working at any given time? If that's the case, then he should be fine using two sources as only one is actually doing anythng. Am I understanding correclty?

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Old 09-09-2008, 09:34 PM   #16
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it would seem that only if the to chargers were aiming for the same charging voltage, would the procedure produce more of a charge. as terry said, the one with the higher voltage output would reduce the other.

this sounds like the conversation of hooking two un-phased generators together.
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Old 09-10-2008, 10:08 AM   #17
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They could easily get too hot and explode, boil dry, etc, etc.

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Old 09-10-2008, 10:54 AM   #18
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I'm not a tech head, but thats bad right?
Normally in this space-time continuum. But like I said, I'm not an engineer.

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Old 09-10-2008, 09:46 PM   #19
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Hi,
We do the same thing at power plants for emergency start diesels. The theory is to keep the battery fully charged (topped up), which is done by running the battery chargers all the time. When the diesels run, they have an alternator that will charge the batteries. My guess is that the umbilical cord may be limited to the wire amperage, for example 10 amps. The charger may give an additional 5 amps for a total of 15 amps charging. Thus, charging his trailer batteries quicker.

There is always a small chance of a battery exploding. That is why batteries are encased in boxes with covers. I would recommend hooking up to the battery with the charger, then closing the cover, and finally plugging the charger in last. This way if the battery did explode then the cover would offer some protection, and the person would have the additional 5 feet of clearance when plugging the cord in.
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Old 09-12-2008, 12:00 PM   #20
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why aren't we all doing this? !

First thanks for all the information and advice. I was in error in post
#1. Instead of umbilicle it is shore power cord (30 amp) that he is charging through. When I saw him utilizing a auto battery charger from the Honda 2000 at the same time charging through the shore cord I became concerned for safety consideration and asked what??? He is definitely convinced that he is getting very good and a faster charge. Then when he saw the accessory car battery cord for Honda he switched out to that instead of the auto charger. Honda's instruction book states to disconnect the ground cable to use this accessory cord. I believe auto battery charger instructions are similar and when charging a car battery in car I always disconnect the ground. Our friends 2 - 6v batteries are located out of his trailer on the tongue so perhaps that is safer. I am not convinced that his dual charge method is safe or we'd all be doing it.
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Old 09-12-2008, 12:17 PM   #21
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First thanks for all the information and advice. I was in error in post
#1. Instead of umbilicle it is shore power cord (30 amp) that he is charging through. When I saw him utilizing a auto battery charger from the Honda 2000 at the same time charging through the shore cord I became concerned for safety consideration and asked what??? He is definitely convinced that he is getting very good and a faster charge. Then when he saw the accessory car battery cord for Honda he switched out to that instead of the auto charger. Honda's instruction book states to disconnect the ground cable to use this accessory cord. I believe auto battery charger instructions are similar and when charging a car battery in car I always disconnect the ground. Our friends 2 - 6v batteries are located out of his trailer on the tongue so perhaps that is safer. I am not convinced that his dual charge method is safe or we'd all be doing it.
Neil.
In my opinion, a nice 3-stage 60A converter/charger that is integral to the rv's electrical system should do the job just fine, no external charging sources should be required. I would use the generator to power the rv's charger through the shore power cord, no use the charge output straight to the batteries.
I don't think your friend fully understands the fragility of batteries when it comes to their charging preferences. No offense intended.
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Old 09-12-2008, 03:18 PM   #22
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In my opinion, a nice 3-stage 60A converter/charger that is integral to the rv's electrical system should do the job just fine, no external charging sources should be required. I would use the generator to power the rv's charger through the shore power cord, no use the charge output straight to the batteries.
I don't think your friend fully understands the fragility of batteries when it comes to their charging preferences. No offense intended.
Thanks, Uwe; No offense taken. This is a very nice friend and, of course, I care that he and his family are safe. As I outlined in post #1 he is definitely no dummy. But.....? I will forward a link of this thread to him.
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Old 09-27-2008, 11:19 PM   #23
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Based on what I am seeing in the posts, this is my take on it:

0) Batteries, generators, charging systems, and camper electrical systems are expensive items. I recommend following the guidelines in the owners manuals. I would be very careful what gets hooked into the camper's 12V electrical system since that has the potential of taking out any appliance or system connected to it.

If you want to play, make sure the battery is disconnected from the camper electrical system first. If you are going to connect a standard issue battery charger to the battery, I would do the same, disconnect the battery from the camper!!

1) The fancy charger in the camper is probably the best way to charge a battery, assuming it is working correctly and isn't an old Univolt. It is designed to charge the battery quickly and keep it charged without overcharging it and damaging the battery.

2) Using a standard battery charger running off an inverter style generator and then putting the generator's 12V power in parallel with it might not cause any problems. I am concerned that the designers of the generator didn't think that possibility through, although it is possible they did and tested for it.

My concern is that the parallel setup of the charger and the generator has the potential of blowing out the transistors and diodes in the generator that are used to generate the 12V. Depending on how it would fail, it might take out the entire inverter.

Also be aware that what works fine with last years generator may not work with this years because something got changed or "cost reduced" during the manufacturing process.

3) As we all know, camper batteries aren't inexpensive. Beating them to death is only going to shorten their life. Over discharging or charging them really does them in. I have seen brand new batteries destroyed over a weekend, expensive Optima Deep Cycle Gel Cells, by someone being careless. If you have a generator, keep the batteries charged to a reasonable level. Keeping the batteries at a decent charge level should take less fuel than trying to bring them back from the dead, they will last longer to boot.

As far as using the generator to charge the battery, the generator probably puts out 13.8 V plus or minus some amount, which won't overcharge a battery assuming it isn't left connected indefinitely.

4) There are applications and systems that are designed to deal with multiple chargers. These are either older designs that aren't particularly sophisticated (like a basic diesel generator set) or they are modern and are specifically designed to deal with it. Just because it works in one application, doesn't mean it will work with your camper.

Running the camper charger off of the generator is my vote. If the vehicle battery needs a little help, hook up the umbilical and let the camper charger do that to (unless you have one of those battery isolators which won't connect the vehicle battery / charging system to the camper without the engine running). Try to keep a reasonable charge on the batteries, trying to eek out the last bit of juice in a battery shortens its life.

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