I want to use a high working PV voltages because my panels will be ground mounted at about 100m from the closet with the MPPTs and inverters. I want to transmit power over the long distance at highest possible voltage (close to 400v) for minimum losses and cable size.
The issue is that to actually maximize the output of the MPPT RS 450/200 you have to divide your panels into 4 arrays as it has 4 separate trackers. The MPPT is capable of a maximum output wattage of 11,520w which is 2,880w per tracker.
I was planning on using what I can find in large format panels. My supplier (In Costa Rica) can get me right now:
Jinko JKM535M-72HL4-TV 535w panels
49.1 VOC
40.63 MPP V
13.85a Short Circuit I
13.17a MPP I
So if I want to use these on the MPPT RS I could put 6 in series to each tracker (24 total panels) and put 3,210w into each tracker. This would over-panel the MPPT by about 11% which I am fine with and Victron is fine with as well. It seems perfect but the problem is the voltage of each array would only be 295 VOC/244 MPP V.
So the working voltage I would transmit over the long distance would be only 244v when I was hoping to do around 400v.
I am wondering if I should consider only using 3 trackers on the device. I believe this is permissible while still being able to get the maximum rated output of the MPPT. Can someone confirm? . In that case I could put 9 panels in series into three trackers (27 total panels) and get 442 VOC/366 MPP V and same array MPP I of 13.17a. This would put 4,815w into each of three inputs thus a total of 14,445w so 25% over-paneled. This could be significant wasted capacity in the dry season but during rainy season I would appreciate the over-paneling.
Or I could do 8 panels in series (24 total) into 3 trackers at 393 VOC/325 MPPT V at 9% over-paneled.
Thoughts?
