The solar regulator is a bit of an orphan - this is the only reference I've ever seen to it on the web:
http://wwwphys.murdoch.edu.au/WebRAPS/disr/casest7.html
It does 12/24/36/48V at up to 60A (@12V). You can also plug it into a current shunt via those connectors on the right-hand-side to use it as an amp-hour meter, but unfortunately the shop had lost the shunt somewhere (old stock).
It will also send pulses of current into the battery when the solar voltage is lower than the battery voltage (24V), which effectively gives me an extra couple of hours of charging per day.
My brother-in-law used to work in a switchboard factory (ie. they made electrical switchboards for office buildings). He had some bus bar left over, it's 2"x1/4" solid copper, with tin plating. I suspect it'd handle quite a few amps... ;-)
It's really easy to tap holes in, too!
BTH