PWM input voltage, Xantrex C40 test video
here is the Video link, the fluke is plugged directly into the Solar panel drop wiring before it enters the controller right above the panel input protection fuse, that i use for a disconnect just c...
Forum Discussion
Mr Wiz, please read this again from crewzer linked earlier. He does the actual calculation which helps explain the input voltage that you see once Bulk is done.
"PWM controllers like the Morningstar TriStar and the Xantrex C40 limit the bulk-stage array voltage to that of the battery bank. In fact, it’s essentially the battery itself that sets the array voltage.....
"It’s likely that the actual array voltage will operate higher than the battery voltage when the controller is functioning in ...absorb, float, or most of EQ... In this case, the array voltage will be the PWM duty-cycle weighted average of the battery voltage and the array’s Voc.
"For example, if the PWM duty cycle is 50%, the battery voltage is 58 V, and the array Voc is 70 V, then the array’s operating voltage would be (58 V x 50%) + (70 V x 50%) = 64 V...."
This is the same as the other posters and the standard blurbs say too.
"PWM controllers like the Morningstar TriStar and the Xantrex C40 limit the bulk-stage array voltage to that of the battery bank. In fact, it’s essentially the battery itself that sets the array voltage.....
"It’s likely that the actual array voltage will operate higher than the battery voltage when the controller is functioning in ...absorb, float, or most of EQ... In this case, the array voltage will be the PWM duty-cycle weighted average of the battery voltage and the array’s Voc.
"For example, if the PWM duty cycle is 50%, the battery voltage is 58 V, and the array Voc is 70 V, then the array’s operating voltage would be (58 V x 50%) + (70 V x 50%) = 64 V...."
This is the same as the other posters and the standard blurbs say too.
