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Old 10-23-2014, 03:53 PM   #11
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The maximum draw that I have seen is 1000 watts with either the coffee maker or the microwave. The longest draw is 12 minutes with the coffee maker. When i have experienced so far is that with the inverter hooked into the main battery box and the secondary batteries being hooked up with alligator clips and 7 ft. of 8 ga. wire. There was almost no heat produced in the secondary wires. Makes me suspect that the closest batteries to the power draw gives the bulk of the charge. When you check voltage while the inverter is working, the batteries that are closest are drawing down more then the secondary batteries. Checked 10 minutes later after batteries are at rest, there is virtually know difference in battery voltage in either battery bank. Done some measuring today and think 20 ft. of cable will be all that is required to reach the rear carrier. Any thoughts???
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Old 10-24-2014, 05:53 AM   #12
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The amount of heat generated may not be enough to feel as it is distributed along the entire length.

1000 watts @ 12 V = 84 amps.

14 ft (7 ft x 2 for two wires) of 8 AWG will support 25 amps.

70 amps at 40 ft (20 ft x 2 for two wires) should be 1/0 AWG

http://www.engineeringtoolbox.com/am...uge-d_730.html
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Old 10-24-2014, 07:13 AM   #13
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I fully agree with your analogy. But feeding off of duel battery banks are clearly giving different results. The fact that the closest battery bank to the inverter produces the most power is a factor that I'm not sure how to calculate. Clearly I need wire heavier then 8 ga. on that long of a run. But the power sharing is undoubtedly going on with both battery banks contributing. 1/0 AWG makes sense if it were the only or primary power source. Thats not the case here.
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Old 10-24-2014, 12:59 PM   #14
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Another thing to think about is that the distance between the batteries (wire resistance and connections) will have an effect on charging the batteries equally. The closest set of batteries (to charger) will more than likely hit a full charge way before the distant batteries get to a full charge. After the charging, stops the batteries that did not get fully charged will bring the fully charged batteries down to their level. This may reduce the life of your batteries, if that second set is not getting fully charged. I would also recommend that you install gauges to monitor your system.

Good luck..

Just my thoughts,

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Old 10-24-2014, 04:26 PM   #15
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When charging the batteries there has averaged .05 voltage difference the two sets of batteries. The batteries closest being the higher voltage. Your right, I need better gauges then just voltage to ascertain what I really have. Thanks for thoughts. All have been greatly appreciated!!
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Old 10-24-2014, 07:55 PM   #16
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I just want you to be safe and get the most out of your batteries.
Enjoy
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Old 10-27-2014, 11:24 PM   #17
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Get a large tool box. Build an AC inverter into it and store a couple 6 volt batteries in it too . Then plug your campers power cord straight into the "tool box" with your batteries in it. You can charge it with a generator or solar.

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Old 10-28-2014, 11:48 AM   #18
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The inverter is already installed in the kitchen right over the factory battery compartment. (3 ft. of cable to the batteries) The tool box idea is a good one but am only putting extra batteries in it.
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Old 10-28-2014, 03:47 PM   #19
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Never run a Converter 1000 watt/Surge 1500 watt on 30ft #8 wire; the max is 6 to 10ft. If you have room for a convertor as I did close to my Power Distribution Center then you can split the #6 or lower# with 3 way switches you can run the fridge during travel. A microwave needs a 1500 watt/2000 W Surge. Always look at the recommendation of the mfg. of the converter. 2x 6 Volt Golf cart batteries in series delivers more Amp hours then the 12 volt group 24 or 27; at least that's my experience. Having a couple of batteries on the TV is not a suitable place. For extra batt. power the best is to figure out something close to the main batt. supply of the 5er or TT.
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Old 11-11-2014, 07:20 AM   #20
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Update on secondary batteries. I bought a clamp type voltage tester to be sure of exactly how many amps were being carried by the batteries. I moved the two group 24's to the back carrier and ran 25 ft. of 4 ga. wire up to the main battery box. I have the inverter hooked to one of the Group 31's in the main box and the secondary batteries hooked to the the second group 31 that is hooked up in parallel. As I suspected, the one battery that is directly attached to the inverter does most of the work. When the inverter is drawing almost a 1000 watts, the main cable is drawing 81 amps. The cable running back to the secondary cables is drawing 19 amps. There is a 1.5 percent voltage drop between the 2 battery banks. Just thought it may be of some use to some of you guys that are thinking about adding more power..
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