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Old 07-31-2015, 03:14 PM   #11
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bats

Interesting and thanks. So at least I understand that what's happening should be happening.
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Old 07-31-2015, 03:32 PM   #12
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Here's some numbers from experience that might be of interest.

We have a 30" LCD (florescent tube lit), a DirecTV receiver, and a power inserter to power the dish. When boondocking, I power all of that from a Go Power 300 watt pure sine wave inverter. My clamp on amp meter (not a super quality one) shows about 7.8 amps when all of the TV equipment is running. Our three cheapo Walmart marine group 27 batteries allow us to watch all the TV we can stand, run the lights and equipment on the trailer including moderate use of the heater if needed.

The above use depletes the batteries to near half, and can be re-charged with our generator, usually the next evening.
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Old 07-31-2015, 03:49 PM   #13
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Yes I've read that adding batteries in parallel gives you LONGER duration of draw down but not more power per se (like series would). So if you have 3 group 27 batteries you should be really good.
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Old 07-31-2015, 03:50 PM   #14
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Originally Posted by mike837go View Post
So 2A draw at 120VAC (24" Flat screen TV) is 20 amps from the battery. In an hour you will have drawn 72,000 amp-hours from your battery pack.
20 amps for an hour is 20 amp-hours...not 72,000 amp-hours.
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Old 07-31-2015, 03:54 PM   #15
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Yes I've read that adding batteries in parallel gives you LONGER duration of draw down but not more power per se (like series would). So if you have 3 group 27 batteries you should be really good.
Power is not dependent on series or parallel. A pair of same kind 12V batteries will provide twice as much power as one battery.

Series batteries = ADD voltage. Amp-hours remain the same.
Parallel batteries = ADD the amp-hours. Voltage remains the same.
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Old 08-01-2015, 04:17 PM   #16
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Hey guys,

12V batteries in parallel. with the TT connected to the neg on one battery and the pos on the other so they draw down equally.
Once the batteries are connected in parallel, you can hook the trailer wires any way you want as long as the black wire goes to a positive terminal and the white wire is connected to any negative terminal. Both trailer wires could be connected to one battery and they will both still draw down together.

The crisscrossing method the guy in the video used is probably because with two batteries on the rack the trailer wires wouldn't reach the outboard terminal on the batteries to hook both tot he same battery.
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Old 08-01-2015, 05:47 PM   #17
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Once the batteries are connected in parallel, you can hook the trailer wires any way you want as long as the black wire goes to a positive terminal and the white wire is connected to any negative terminal. Both trailer wires could be connected to one battery and they will both still draw down together.

The crisscrossing method the guy in the video used is probably because with two batteries on the rack the trailer wires wouldn't reach the outboard terminal on the batteries to hook both tot he same battery.
Somewhere I've read about a particular way to connect batteries in a parallel configuration that should be used to maximize battery life, similar to that mentioned by dangerdave. Does anybody know where this connection method is discussed in detail?
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Old 08-01-2015, 05:47 PM   #18
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Here is the most efficient method for hooking up (2) 12Volt batteries in paralllel. It produces a more even charge and discharge.

Also, go an Amazon and get an inexpensive digital voltage display that plugs into your TT's 12VDC accessory plug, so you can monitor your batterys to insure that the voltage does not drop below 12VDC. The battery monitor lights on the TT are not really worth anything.
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Old 08-01-2015, 05:54 PM   #19
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My 12VDC battery bank (three each GP24 12V 85AH Interstates) connected in parallel gives me 255AH s of capacity. My parasitic drain is around 1.5 amps 24/7.

We usually start drawing around 20AMPS of DC current to run our toys and lights from 6PM to 11PM. This along with the parasitic drain drops my three batteries down to around 12.0VDC (approximately 50% charge state) by 8AM the next morning.

At 8AM each morning when allowed to run our Generator we will connect our trailer shore power cable directly to our 2KW Generator using a RV30A-15 Adapter which allows the on board PD9260C 60A Converter/Charger unit to recharge my battery bank back up to their 90% charge state in around three hours time.

Been doing this since 2009 and my GP24 12V Interstates are just now starting to fall off on performance...

If we get to the 90% charge state then we can do all this all over again the next day/night run off the batteries...

Hoping to get 2ea 12V Trojan 150AHs batteries to replace my old interstates. This will give me around 300Ahs of capacity.

I suspect in your case you did not start out with either a full charge or at least a 90% charge state. My batteries give me almost the same performce at 90% as they do at 100%. I can only only do these 50-90% charge states for 12-14 times before I have to do a full 100% charge state or risk doing internal damage to the batteries. It would take a 12 hour or so generator run time using my PD9260C 60A converter/charger to reach a full 100% charge when camping off the power grid. That is usually when we head for home

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Old 08-01-2015, 07:10 PM   #20
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Originally Posted by Mustang65 View Post
Here is the most efficient method for hooking up (2) 12Volt batteries in paralllel. It produces a more even charge and discharge.

Also, go an Amazon and get an inexpensive digital voltage display that plugs into your TT's 12VDC accessory plug, so you can monitor your batterys to insure that the voltage does not drop below 12VDC. The battery monitor lights on the TT are not really worth anything.
Don


I got this for display:

Amazon.com: INNOVA 3721 Battery and Charging System Monitor: Automotive
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