TheBatteries
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- Oct 8, 2016
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I asked this a while ago and I remember Daniel telling me it's a bad idea, but I don't understand why and want some more information...
Right now I have 8pcs of 36V solar panels. The specs are 320W, 46.2Voc, 37.3Vmp. I cannot wire these in 3s on the PCM60X because on bright sunny cold winter days, the open circuit voltage exceeds what the PCM60X can handle and the unit shuts down. To prevent this from happening, I have the panels wired in 2s giving 92.4Voc and 74.6Vmp. The minimum MPPT voltage for the PCM60X is 60V, so I feel like I'm losing some power I could be harnessing in the early morning/late evening by running my strings at only 92.4Voc.
I also have 4pcs of 12V Renogy panels. The specs on these are 100W, 22.5Voc, 18.9Vmp.
I would like to wire them like this
320W-320W-100W||
320W-320W-100W||
320W-320W-100W||
320W-320W-100W||== Combined Output
Doing this would give me 114.9Voc and 93.5Vmp. I was told before this was a bad idea. If all the 320W are exactly the same and all the 100W are exactly the same, each 3-panel string is exactly the same. Why would this be bad an I lose efficiency?
Right now I have 8pcs of 36V solar panels. The specs are 320W, 46.2Voc, 37.3Vmp. I cannot wire these in 3s on the PCM60X because on bright sunny cold winter days, the open circuit voltage exceeds what the PCM60X can handle and the unit shuts down. To prevent this from happening, I have the panels wired in 2s giving 92.4Voc and 74.6Vmp. The minimum MPPT voltage for the PCM60X is 60V, so I feel like I'm losing some power I could be harnessing in the early morning/late evening by running my strings at only 92.4Voc.
I also have 4pcs of 12V Renogy panels. The specs on these are 100W, 22.5Voc, 18.9Vmp.
I would like to wire them like this
320W-320W-100W||
320W-320W-100W||
320W-320W-100W||
320W-320W-100W||== Combined Output
Doing this would give me 114.9Voc and 93.5Vmp. I was told before this was a bad idea. If all the 320W are exactly the same and all the 100W are exactly the same, each 3-panel string is exactly the same. Why would this be bad an I lose efficiency?