If available, it would be published in your charge controllers specifications. The mA draw of a MPPT SCC is generally not a concern with a typical system.
You don't want this. If you use switches, each should ONLY do ONE of the following:
1) disconnect battery from inverter/12V loads (your main switch can do this)
2) disconnect panels from controller (you don't have this)
3) disconnect battery from controller (you have this in your 70A breaker, but the wire should be run directly to the battery)
#2 is particularly important. Some charge controllers indicate that the battery must be connected first before connecting the panels. In some cases, failure to do so can damage the controller.
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