tp002c784tp002c784tp Posted June 20, 2009 Share Posted June 20, 2009 Hi All I have just aquired 2 heavy duty 6 volt batteries ex fork lift truck. I was told that these batteries are very expensive and are 175amp each. I was thinking of using them as a leisure battery but the snag is my leisure batteries are under the drivers and passenger seats and although I will be using the heavyest cable I can to connect them together I am a bit bothered about voltage drop. Have the auto electricians out there any comment Terry Link to comment Share on other sites More sharing options...
mike 202 Posted June 20, 2009 Share Posted June 20, 2009 If you use heavy duty battery cables to the original cables, it will be ok. a much longer cable run is to your lights, pump etc using much thinner cable. For the techincal reasons, V=IR that is Volts drop will be the current flowing times the cable resistance. So if you take say 5 Amps through a resistance of say 1/10 ohm then you lose 1/2 volt. Decent cable used to connect starter motors etc in cars will have negligible resistance over a few feet. We are talking 1/4 inch dia cable core here. Link to comment Share on other sites More sharing options...
Clive Posted June 20, 2009 Share Posted June 20, 2009 Sounds like you have some cracking batteries. If you have a large inverter to run a microwave oven or similar then you will need a stout seriesing cable beween the two seat bases. Other than that a length of 6 sqmm cable would be my minimum suggestion. You can make the "remote" battery pick up a chassis connection from its own seat base so you only require one cable between the two seat bases. More on http://www.motts.org/second%20leisiure%20battery.htm C. Link to comment Share on other sites More sharing options...
tp002c784tp002c784tp Posted June 21, 2009 Author Share Posted June 21, 2009 Thanks chaps, I do understand how thick the joining cables needs to be and voltage drop as my wife used to have a vw beetle which was six volts and if the battery was down a bit it would not start, and I do remember although its many years ago I fitted a relay in the starter motor and this cured the problems. The only thing I was thinking am I going to gain much power at the moment my leisure batteries are 2x 85amp and as I say above the 6 volts are 175amps each and will fit under the seats where as the equivelent amperage twelve volts would be to big. Terry Link to comment Share on other sites More sharing options...
colin Posted June 21, 2009 Share Posted June 21, 2009 The extra capacity will be minimal, 175amp/hr at 6v is little more than 85amp/hr at 12v, as they are both of a similier technology the saying "you can't get a quart in a pint pot" is true. Link to comment Share on other sites More sharing options...
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