I have a Smart Solar 150/85 in use where I connected 12x 400W Pannels in a 3S4P configuration.
I used the Victron MPPT Sizing Calculator and everything works fine at the moment.
Every 3S String is connected to a 15A Breaker before it's connected parallel with the other 3S Strings. In between the parallel connected Strings and the Smart Solar Charger there is also a DC 63A Breaker.
In Wintertime with all the cloudy and foggy weather condionions we only a few days where the solar really peaks, so mostly I just have below 1000W output from the charger.
Lets say I would add 2 additional 3S Strings to the Charger so I get a 3S6P configuration. The smart solar charger provides max. 85A Output and it's Input short circuit current is 70A. The panels I use have a short circuit current of 13.52A, means 6x13.52 = would bee 81,12A which is more than the allowed 70A of the charge controller. Though I still have the 63A Breaker in between.
So here's my question: Is it possible to "overprovision" the solar charger on the input side without any risk? It's clear that the output will be never more that 85A/4900W, I'm fine with that, in summer I have more than enough power, but it would be helpfull for classic winter condtions.
What would happen on a sunny day where the output of the panels could theoretically peak to their maximum of 400W? Would the MPPT Tracker of the charge controller take care of that the Input current never exceeds the supported 70A Input Power and cut off the power.
Is this a common/supported configuration?
Thanks Stefan
