I've wired up my solar panel and now want to fit the CSB2 device. Best place to fit? At the split charge relay in the engine bay (a bit of a hostile environment and can't see the LED)? At the inputs to the Sargent PSU2007 charger (this has cab and leisure battery inputs so I could splice in ....and could see the CSB2)? I've sent an email to Sargent but I'm sure they would not condone fitting anything near their unit. Or completely independant wiring to vehicle battery? How have others done it?