Hi
There are loads of different ways of doing it and everyone has their own opinions. IMHO, for what it's worth, the all singing all dancing setups seem unnecessarily complex. The more 'blackbox' electronics there are, the more there is to go wrong and the harder it is to fault find.
In my HJ60 i run with two aux batteries in the back charged from a simple diode block. There are no moving parts, so it isn't affected by dust, vibrations etc etc. You simply wire the alternator output to the middle terminal on ther diode block and each 24v battery bank connect, via a fuse, to the outer two terminals on the diode...thats it.
I'm guessing, like me, you bought a 60 because they are durable and simple to work on. I've tried to carry that philosophy on with any mods i make.
Some will say that diode blocks give you a large voltage drop, i've measured it on mine and each battery bank is receiving 0.6v less than the alternator is kicking out, on a 24v system this hardly seems like the end of the world and certainly hasn't caused me any problems.
But, as i said, everyone has their prefered way. What ever you do, i would stick with a 24v aux bank though. It keeps it simple and you could jump start yourself if need be.
All the best
Sam

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