smo Posted December 10, 2007 Share Posted December 10, 2007 My winches came fitted with AWG 2 sized cable, firstly what that in mm2, as most people refer to area rather than guage, and secondly is it enough for my winches in a realistic environment? Quote Link to comment Share on other sites More sharing options...
GBMUD Posted December 10, 2007 Share Posted December 10, 2007 33.61sqmm from Here Chris Quote Link to comment Share on other sites More sharing options...
discojmz Posted December 10, 2007 Share Posted December 10, 2007 what is the current requirement of your particular winch(es)? Quote Link to comment Share on other sites More sharing options...
smo Posted December 10, 2007 Author Share Posted December 10, 2007 Cool, so generally known as 35mm2 then. As for current, they are EP9's - i assume they supply beefy enough cable, however its not always the case!! Quote Link to comment Share on other sites More sharing options...
miketomcat Posted December 10, 2007 Share Posted December 10, 2007 IIRC EP9's draw 450 amps at stall i use 50mm2 which i think only has a contiueos rating of 150 amps but the sparky at work reckond it was enough and i've had no problems with it mike Quote Link to comment Share on other sites More sharing options...
Ex Member Posted December 10, 2007 Share Posted December 10, 2007 With a Defender, it makes sense to go larger due to the long cable runs compared to a "normal" vehicle. IMO, welding cable is the best choice. It is flexible and has a strong, heat resistant insulation. I'm running 2/0, which calculates out to 0.4 volt drop at 450 Amps for about the run required. The 2 guage would give around 0.85 Volts drop. Quote Link to comment Share on other sites More sharing options...
Les Brock Posted December 10, 2007 Share Posted December 10, 2007 and again......... Bish....from another post I did Current carrying capacity 25 mm - 183 Amps 35 mm - 226 Amps 50 mm - 274 Amps 70 mm - 351 Amps Roughly ..... for 90 oC Tri Rated cables degined to run hot volts drop for those interested.... 25 mm - 1.85 Mv/A/M 35 mm - 1.35 50 mm - 0.99 70 mm - 0.68 all these are Millivolts/per amp/per metre... so for example.... 70mm @ 0.68 Mv-A-M/ 300 Amps / 4 m cable run = 0.81 Volts drop 35 mm @ 1.35 Mv-A-M/ 300 Amp /4 m cable run = 1.62 Volts drop this would be higher if your current draw is higher obviously 70mm @ 0.68Mv-A-M / 450 Amp / 4m Cable = 1.22 Volts drop 35mm @ 1.35Mv-A-M / 450 Amp / 4m Cable run = 2.43 volts drop so your 12 volt winch with nominal 12 volts could only be getting 9.57 volts at the motor....using 35mm compared to 10.78 using 70 mm obviously you will have hopefully a bit more that the nominal 12 volts available but after a fair bit of winching you may not , and its only for comparison HTH Quote Link to comment Share on other sites More sharing options...
smo Posted December 10, 2007 Author Share Posted December 10, 2007 Excellent, thanks Les Quote Link to comment Share on other sites More sharing options...
Matthew Posted December 11, 2007 Share Posted December 11, 2007 See also...... Lifetime Cable Guide (part numbers/spec etc) http://www.power-store.com/includes/download.asp?docid=296 Our clever little cable calculator (remember when you enter length, you need to add the total length of +ve and the total length of -ve) http://www.power-store.com/includes/download.asp?docid=297 Manual for the above... http://www.power-store.com/includes/download.asp?docid=298 I'm able to supply everything from 0.8mm2 - 103mm2, single core, dual core, triple core. Its all oil/UV/chemical proof and its even fire retardant!! also tinned marine grade so it should never corrode.... B) Matt. Quote Link to comment Share on other sites More sharing options...
antichrist Posted December 11, 2007 Share Posted December 11, 2007 You want a max volt drop of 0.5 volt. Welding cable will give better results than typical battery cable (more strands for a given size). If use vu-tron cable from Carol Cable, you can go one size smaller, compared to welding cable. If your stall amp draw is 450amps, a 10' #2 cable will give you a volt drop of 0.90 volts. To get down to 0.5 volts you'll need 0 (one aught), or 8.25mm dia, cable. 2/0 (a very large cable) will give 0.41 volt drop. Quote Link to comment Share on other sites More sharing options...
JDB Posted January 7, 2008 Share Posted January 7, 2008 ...sorry to awaken an old post - but am I right in thinking that this http://cgi.ebay.co.uk/Welding-Cable-35mm-2...oQQcmdZViewItem will do the job for a removable winch (Warn 9.5XP) at front or a long run to the rear for occasional use? I was proposing to use Anderson connectors to limit voltage drop as well? Can I get the cable cheaper? Grateful for advice. Quote Link to comment Share on other sites More sharing options...
smo Posted January 8, 2008 Author Share Posted January 8, 2008 I got some from here brfore - excellent service http://www.thewelderswarehouse.com/Welding...g_Supplies.html Quote Link to comment Share on other sites More sharing options...
tonyalbers Posted January 8, 2008 Share Posted January 8, 2008 and again.........Bish....from another post I did Current carrying capacity 25 mm - 183 Amps 35 mm - 226 Amps 50 mm - 274 Amps 70 mm - 351 Amps Roughly ..... for 90 oC Tri Rated cables degined to run hot volts drop for those interested.... 25 mm - 1.85 Mv/A/M 35 mm - 1.35 50 mm - 0.99 70 mm - 0.68 all these are Millivolts/per amp/per metre... so for example.... 70mm @ 0.68 Mv-A-M/ 300 Amps / 4 m cable run = 0.81 Volts drop 35 mm @ 1.35 Mv-A-M/ 300 Amp /4 m cable run = 1.62 Volts drop this would be higher if your current draw is higher obviously 70mm @ 0.68Mv-A-M / 450 Amp / 4m Cable = 1.22 Volts drop 35mm @ 1.35Mv-A-M / 450 Amp / 4m Cable run = 2.43 volts drop so your 12 volt winch with nominal 12 volts could only be getting 9.57 volts at the motor....using 35mm compared to 10.78 using 70 mm obviously you will have hopefully a bit more that the nominal 12 volts available but after a fair bit of winching you may not , and its only for comparison HTH Ah yes, and the voltage drop is pretty bad. Since the power(in Watts)is calculated as UxI (voltage times amperage), the difference in power for Les' example would be: 70mm2 @ 0,68Mv-A-M / 450 Amp / 4m Cable = 1,22 Volts drop = 10,78 Volts times 450 Amps = 4,851 kilowatts = 6.6 HP 35mm2 @ 1,35Mv-A-M / 450 Amp / 4m Cable run = 2,43 volts drop = 9,67 Volts times 450 Amps = 4,306 kilowatts = 5.8 HP Which means that you effectively lose almost 1 HP from your winch motor. /tony Quote Link to comment Share on other sites More sharing options...
tonyalbers Posted January 8, 2008 Share Posted January 8, 2008 ...sorry to awaken an old post - but am I right in thinking that this http://cgi.ebay.co.uk/Welding-Cable-35mm-2...oQQcmdZViewItem will do the job for a removable winch (Warn 9.5XP) at front or a long run to the rear for occasional use? I was proposing to use Anderson connectors to limit voltage drop as well? Can I get the cable cheaper? Grateful for advice. Nah, it's too thin. But you could double(run 2 cables in parrallel) it though, that would give you a total of 70mm2 Check my calc in this thread. /tony Quote Link to comment Share on other sites More sharing options...
smo Posted January 8, 2008 Author Share Posted January 8, 2008 One thing to consider though, elec winches will only draw 450A at stall (unless you hav somthing "special", so its not going to be as bad as a simple calc makes out! Quote Link to comment Share on other sites More sharing options...
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