Do you carry a generator? - Page 2 - Fiberglass RV


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Old 06-13-2011, 08:35 PM   #15
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Originally Posted by cpaharley2008 View Post
Actually if your batteries are connected together, you will only have about 100 a/h between the two. With 2 disparate batteries, the weaker one will drain the stronger one quicker than if they were both equal. Don't ask me where I read this but this is the way I remember it.

Simply not true. If you take two containers of water, say a 5 gallon and 10 gallon container, take water out through a common connection are you only going to get 5 gallons of water?

That said there's only been one time I connected them together, that was when the 80 amp-hour was drained and it was easier to connect the 50 amp-hour in parallel than to disconnect the 80 amp-hour at 4:00 am when the temperature was almost 5F. By the way it made it to 5F.
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Old 06-14-2011, 08:36 AM   #16
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Actually what I found was that they have to be identically charged- the weaker one will pull from the stronger one-

12.2 Parallel

If you connect batteries in parallel you must be very careful that they are exactly the same type, same state of charge, and the same age, much more so than in the serial connection above. Batteries have an internal resistance, which goes up as they discharge. Imagine the following connection where one battery is fully charged and the other is discharged:


The discharged battery on the right has a terminal voltage of 10.5V and an internal resistance of 8 milliohms. The fully charged battery on the left has a terminal voltage of 13.2V and an internal resistance of 4 milliohms. The internal resistances are shown in the circuit for clarity. When the two batteries are connected together in parallel, the fully charged one will start charging the discharged one. A current will flow around the loop between the two batteries of


This current is very high and may damage some batteries.

If the batteries are at an identical state of charge, their terminal voltages will be the same, and so no appreciable current will flow when they are connected in parallel. Any imparity will be evened up as the one with greater charge and hence terminal voltage charges up the other.
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Old 06-14-2011, 10:57 AM   #17
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There are two issues, battery capacity measured in Amphours and voltage measured in Volts. You can connect in parallel lead flooded acid batteries with different capacities and still get total capacity which will be approximately a sum of both. A different voltage between any batteries will drive current to equalize their voltages. Voltage drives electrons flow not capacities. It is best to connect identical batteries to get best life from them.

George.
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Old 06-14-2011, 11:06 AM   #18
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Quote:
Originally Posted by cpaharley2008 View Post
Actually what I found was that they have to be identically charged- the weaker one will pull from the stronger one-

12.2 Parallel

If you connect batteries in parallel you must be very careful that they are exactly the same type, same state of charge, and the same age, much more so than in the serial connection above. Batteries have an internal resistance, which goes up as they discharge. Imagine the following connection where one battery is fully charged and the other is discharged:


The discharged battery on the right has a terminal voltage of 10.5V and an internal resistance of 8 milliohms. The fully charged battery on the left has a terminal voltage of 13.2V and an internal resistance of 4 milliohms. The internal resistances are shown in the circuit for clarity. When the two batteries are connected together in parallel, the fully charged one will start charging the discharged one. A current will flow around the loop between the two batteries of


This current is very high and may damage some batteries.

If the batteries are at an identical state of charge, their terminal voltages will be the same, and so no appreciable current will flow when they are connected in parallel. Any imparity will be evened up as the one with greater charge and hence terminal voltage charges up the other.

The batteries in parallel will find an equilibrium if not both fully charged to the same point. However the total capacity will not change. Same way with the water example I gave earlier.
Another example in real life.
I ran down the house battery (80amp hour) to the point the fan in the furnace wouldn't run. I connected the 50amp-hour in parallel with the discharged battery and went back to sleep with the furnace running.

Furthermore I know of several installations of batteries used to for radio repeaters in case of power failure that have several different capacities all connected together. The idea presented that they have to be all the same is a like many other things in the electrical world a myth.
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Old 06-14-2011, 11:50 AM   #19
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Installed my generator on the tongue of my Egg Camper today. Fastened it down with two ratchet straps, secured it with a bicycle locking cable, and put a propane tank over it to hide it. Now less than two weeks until we can hit the road to Colorado.
Now:
1. Purchase a 30amp extension cord.
2. Plug the male end into the generator.
3. Run the extension cord under the trailer, connecting it to the frame
4. Cut off the female end
5. Drill hole into the electrical compartment
6. Thread the extension cord into the compartment
7. Add a 30amp outlet to the cord and secure it.

When ready to use the generator simply reach into the compartment and plug the trailers 30amp power cord into the outlet. Nothing is out in the weather or hanging down on the ground.

I love things that are slick and clean.

"Thanks Mel for the idea"
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