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Old 4th December 2008, 12:54   #1
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Default 12V or 24V

Please throw light for my understanding "Which one is better. A 12V or 24V electrical system". Also components of which systems costs more. And why is it so that in heavier applications like tractor trailors and tippers 24V system is used.
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Old 4th December 2008, 21:13   #2
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It depends upon the requirement.

trucks have 24volt system because it need lot of battery juice to crank the large 6+ cylinder engine. ALso battery is needed for prolong use of numerous hazard light that the trailer might have without the engine running (For Eg: roadside repairs)

24volt system are also used in military FFR vehcile, meaning fitted for radio. Guess why?
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Old 5th December 2008, 16:41   #3
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But in few truck like TML 1613 & 2515 or Eicher 20.16 having 6 cylinder on board are using 12V system. Also the battery capacity on 12v system is high as 110/120Ah where as in 24V system batteries of lower capcities are used. Can you help me understand that.
Also what happens to components in 24V system in terms of price costlier or cheaper than 12 v system.
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Old 5th December 2008, 22:40   #4
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eicher definitely uses 12volts system. but TATAS sold in hills always had 24volts, now i don't know much, because we are out of that business.
i know this because I encountered a hitch long ago when fitting a nakamichi system in one of our 1510 based bus. I remember creating a jump system taking exact 12volt from the half terminal of battery.

i cannot state any more advantage than that 24volts system helps to crank the engine in real cold weather easily. finding a 24volt system bulbs was a pain. also engine needs to haul the higher ampere charger to charge it. This is the reason that TATA might have abolished all the 24 volt system on most rigid trucks. I guess military vehcile still uses the 24volts system. But again 713 uses 12 volts. I have driven it. Dunno about AL stallion.

Last edited by SirAlec : 5th December 2008 at 22:49.
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Old 5th December 2008, 23:14   #5
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24volt systems can do with lesser amps when compared to a 12volt system.
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Old 6th December 2008, 05:55   #6
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Quote:
Originally Posted by Sankar View Post
24volt systems can do with lesser amps when compared to a 12volt system.
Exactly. 12v system needs double the current for the same amount of power and battery will need to be bigger, for the same AH capacity. Though I think they use 2 12v batteries in series in buses.
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