Switch to MPPT charger controller?
I have a small 12V system with two - 115watt panels in parallel charging a pair of 6v - 415ah lead acid batteries in series with a PWM charger controller (Sunsaver 20 w/LVD). This system has been in operation for a little over 3 years. I am thinking about switching out the PWM charger controller for an MPPT charge controller to improve charge efficiency, especially in the fall/winter months. Would there be any concern with the batteries in changing the charge method? Also, I would like to add to the system but the current panels have been discontinued. If I were to switch to MPPT could I then add additional panels in the 110-120watt range to the same charge controller or would it be better to add another charge controller in parallel with all panels attached to it being identical?
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