charge controller clipping too much
I have 4-100 watt 12v modules connected to a Xantrex C40 CC that charges 2- 6v batteries in series for a small 12v battery bank at 225A hrs. Usually at mid day with lots of sun the CC usually puts out 20A, for some reason in identical conditions today it is clipping to 7A-9A. I tested the modules by disconnecting one then another and sure enough the CC quickly regulated the output to that 7-9 range, even with fewer modules connected? It's in bulk mode. Why such a drop in output?