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
red31 wrote:BFL13 wrote:
Today his battery bank has reached the controller's high voltage set point near 14.3, and the battery side is 14.34v. The array side is 19.10v.
If Voc = 21v that yields ON time of 28.4%
(14.3*.284) + (21*.716) = 19.1v
(Isc(Ipanel @14.3v sun adjusted) *.284)+(Ioc(zero)*.716) = I*.284
Math is happening! :) Actually that 130w panel in the sun usually had a Voc of about 20.3v (rating 21.9v) with the heat, while it was cranking out its rated amps of 8.2 or so.
They have been away for a few days so I got the above reading where there is not much 12v load. I don't know what they leave on when they are away. So his batts ( four 6s) are quite full.
Side note: that is how he can get away with a single tilted South 130 on four 6s and the batts don't go bad on him. He is away enough that they get to true full during the day on those away days (when sunny) the 14.3 float is not losing him much water either. Just right! :)
BTW red31, I used your equation of time/declination graph I printed last December in my post on tilting yesterday. Maybe you could repost that graph in that thread? Thanks.
