The max input voltage of a MPPT charger is often stated as max at a given temperature and somewhat lower if it is hot, like hot weather. So be very cautious to stay away from the max within your operating temperature. What might be good in the winter may be death to your charger in hot weather if the system was unloaded and the charger say the open circuit voltage.
Also, the way most panels are wired (internally) any shadow/shade will take their output to near zero. Put 3 panels in series and put that same shade on one panel and the output for all three drop together. Shading is a big factor that can greatly reduce your output and shading on series panels even more so.
Also, the way most panels are wired (internally) any shadow/shade will take their output to near zero. Put 3 panels in series and put that same shade on one panel and the output for all three drop together. Shading is a big factor that can greatly reduce your output and shading on series panels even more so.