Cheers for the replies guys! To be honest the starting battery is not what concerns me - why? Well the aux battery is what will get drained when parked up, by fridge and lights or whatever, and as my starting battery is in fairly good condition and will not be affected by any discharge from the aux system then I would only want to monitor the aux one. I suppose if it was really desired it would not be too difficult to install a second shunt and a switch system to check both batteries (but probably only voltage as I would imagine the 'memory' of what has been discharged would be totally wrong if switching between two batteries...)
Gil
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