6x12 cell Panels? ~37V Vmp?
Last year I installed in parallel a couple of 6x12 cell, 36.7Vmp, 195W, mono panels and have been very happy with them. They were only 32" wide so fit perfectly along the rear of the trailer. Anything...
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You don't just match up the ratings, you have to match up the characteristics too. Mono's and Poly's react differently to different light levels and that will confuse the controllers ability to track.
I have found this in my original panels, a 220w mono and 230w poly. They were never at the same no matter the light level. My 245w mono and 250w poly were close in bright light but vastly different when that light changed. So if you can't match them up, do dual systems.
That's why I suggest to cover the roof at the get go. I would have been happy to use my 230w Schott poly for it's low light abilities but they were discontinued years ago. Newer polys have a smaller foot print and that made it easier and cheaper to start fresh with three matching panels than finding two panels that matched up with the Schott.
It is far easier to add to a PWM system even though you lose a good chuck of power when the batteries voltage is low.
I have found this in my original panels, a 220w mono and 230w poly. They were never at the same no matter the light level. My 245w mono and 250w poly were close in bright light but vastly different when that light changed. So if you can't match them up, do dual systems.
That's why I suggest to cover the roof at the get go. I would have been happy to use my 230w Schott poly for it's low light abilities but they were discontinued years ago. Newer polys have a smaller foot print and that made it easier and cheaper to start fresh with three matching panels than finding two panels that matched up with the Schott.
It is far easier to add to a PWM system even though you lose a good chuck of power when the batteries voltage is low.
