[RE-wrenches] Number of Controllers

[Colin Vogt]

Wrenches,
What considerations are there for the number of charge controllers  
that can be in a stand-alone system with a single battery bank?  If  
one uses MPPT controllers, then  one would want (I think) a different  
controller for different module orientations.  That is, if one had a  
couple modules at one azimuth/tilt angle you would have a controller  
for that, and another controller for a module at a different azimuth/ 
tilt angle.  Also, I can see having a controller to turn on yard  
lights (Morningstar makes one, although it is not an MPPT type and is  
of limited capacity).  Could also one have a controller for diversion  
loads?  And also a controller for a wind generator?  So I can see  
where a stand-alone system might have 4 or maybe even more  
controllers, all tied into the same battery bank.  Are there any  
considerations for a system like this?  For instance, do the setpoints  
for all controllers need to match?
Colin Vogt