packnrat Posted August 24, 2018 Report Share Posted August 24, 2018 changing to four 6 volt deep cycle batteries. so get to build new cabling. what is the recomended size for this app? not really up on what size is what, ( i just know a 1/2 in or so od size will out do my needs voltage/amps wise) or good for. aka best for 12 volts. longest run will be less than 10 feet. more like only five feet. and then why not welding cable? yes i know auto cabling has a harder shell. ( durability for abrasion) and welding cable has finer cabling wire. Link to comment Share on other sites More sharing options...
DesertMiner Posted August 24, 2018 Report Share Posted August 24, 2018 https://www.calculator.net/voltage-drop-calculator.html Link to comment Share on other sites More sharing options...
packnrat Posted August 24, 2018 Author Report Share Posted August 24, 2018 so even with 4/0 gauge at 5 feet. i can not get a full 12 volts?? did i work that computer program right? as i type this my power requriments are not know to me. it is a small rv, reffer, heater, other? and a cpap. any other over night? and this is after bed time. before would be lights, water pump, other but cpap would be off at that time. will try and do a proper audit for needs. but with 4 - 6 volt deep cycle i have more than needed. ( i hope). yes gen during the day. no hook ups, boon docking. in a area with no noise restrictions. but try to keep the gen to a min at night. just because. Link to comment Share on other sites More sharing options...
DesertMiner Posted August 24, 2018 Report Share Posted August 24, 2018 https://www.calculator.net/voltage-drop-calculator.html?material=copper&wiresize=0.1608&voltage=12&phase=dc&noofconductor=1&distance=5&distanceunit=feet&amperes=250&x=67&y=14 Link to comment Share on other sites More sharing options...
Ronbo Posted August 24, 2018 Report Share Posted August 24, 2018 4/0 cable, 12 volts, it will actually be more, 10 ft distance, 12 amps. The voltage drop will be 0.012 volts. Ron C. 2013 Dynamax Trilogy 3850 D3 2000 Kenworth T2000 Optimus Prime Link to comment Share on other sites More sharing options...
packnrat Posted August 25, 2018 Author Report Share Posted August 25, 2018 i do not know why it is so hard for me to wrap my head around all this. i do get the basics. have not zaped myself with 50K .. yet😜 all the values are geberish to me. but i get if i run 4.0 cable between batteries and converter i am good to go... right. i try to it the right way, maybe a bit over kill. thinking the 4 6 volts. ground to frame. and to inverter/converter. poscable through a marine cut off switch. via a fuse off the batteries. then on to feed into the coach. along the way will hook up in a wire to feed from solar. yes need to buy the correct electronics for this. trying to learn as best as i can. i know as long as the magic smoke stays in things. i am good to go. 😃 Link to comment Share on other sites More sharing options...
Chad Heiser Posted August 25, 2018 Report Share Posted August 25, 2018 4/0 cabling will handle your needs with no issue. I prefer to over build things and I always use 4/0 cable on all the battery banks I build. You could go down to 2/0 and still be fine, but I prefer the 4/0 for my systems. I also always use welding cable when building battery cables. It is much easier to work with and bends much easier. Anywhere it passes through something, I always sheath it to prevent any rubbing. 2009 Volvo 670 with dinette/workstation sleeper - Walter 2017 DRV Mobile Suite 40KSSB4 with factory mods, dealer mods and personal mods - now in the RV graveyard 2022 DRV Full House MX450 with customized floor plan 2018 Polaris RZR Turbo S (fits in the garage) 2016 Smart Car (fits in the garage or gets flat towed behind the DRV when the RZR is in the garage) My First Solar Install Thread My Second Solar Install Thread & Photos and Documents Related to the build My MX450's solar, battery and inverter system - my biggest system yet! chadheiser.com West Coast HDT Rally Website Link to comment Share on other sites More sharing options...
ALLOY Posted August 25, 2018 Report Share Posted August 25, 2018 I prefer to use tinned marine cable as there is no capacity lost to corrosion over time. If there are tight corners I'll sometimes use Superflex or 2 smaller cables such as two 1/0 wires instead of a single 4/0. Having the proper stranding in the cable (22-26ga) ensures the best ( a good crimper is needed) contact between the wire and the inside of the terminal when crimped. The temperature rating of the insulation will affect the capacity 2011 Cameo 34SB3 Link to comment Share on other sites More sharing options...
Sehc Posted August 27, 2018 Report Share Posted August 27, 2018 Marine cable is best. It is consistent in quality. With welding cable, there is a lot of differences between companies. The inter-connecting cables on the golf cart batteries are important. I recommend having them made commercially, I use GrenuineDealz or BayMarineSupply. GenuineDealz has given me excellent service and quick delivery. 4/0 is heavy. Check that 2/0 will be enough for your expected ampere draw. It is not good practice to use doubled cables for one circuit. One cable set will always have a different resistance and one cable could carry enough extra to cause a problem. Link to comment Share on other sites More sharing options...
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