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Hi redarc makes a range of them from 3 to 60 amps i would reccomend not going under 20amps http://redarc.com.au/products-and-se...arge-equaliser is the link i do not work for them i work for a auto electrision in mackay we do alot of work for Greyhound is this is the bus company i was refering to their problem is on their motorcoaches they are all 24volts except the eton auto shift computer whitch runs 12volts and it needs a realy good supply as it needs good voltage to power the motors on the gearbox to physicaly change gears. in short it generly quite worth it for these setups any good auto electrision should be able to sort you out unless you intend on realy draining the 12v battery like fridge for days with out driving then this is all you should need for those who want a 12v aux battery you can get a unit called bcdc from redarc when wired with ignition it can down size 24volts to 12 and also charge the aux battery the correct way ie boost absorption and float these are more expensive like 6-700 bucks but we have had good sucess with these items. i am happy to help with other questions to do with electrical.