Advice on adding starter battery
I hope this is not a redundant question for the forum but I want to add a starter battery just for that purpose to my existing two deep cycle batteries. At this time I have the typical battery switch for each battery as a separate bank: battery 1, both, battery 2. A common suggestion is to put in parallel both deep cycle batteries as one bank and and add the starter battery as the second bank. I have a Zantrex truecharge2 40amp charger. My questions are:
1. is this the best way of setting it up?
2. can I set up the alternator to charge both starter battery and
house bank under power or do I need to add another switch solely for
the starter battery so I can switch over to either bank?
3. if a starter battery switch is needed, any suggestions?
I will be in the near future adding a 135W solar panel to the system with a charge controller if this will make a difference.