adirondack_wanderer
New Member
I had my first over-voltage issue today after roughly a year without any problems. My charge controller is limited to 150V and I use 4 PV inputs of 3 strings of 100W panels with 6 in series (total 12 arrays and 72 panels) and each panel's Voc is listed at 24.3V. The arrays are house roof-mounted and paralleled with Y-adapters. This has not been a problem for roughly a year but today I flipped on the PV disconnect and the voltage was reading roughly 154V and of course the charge controller stated over voltage. Normally the PV disconnect is on and as the sun comes up the voltage slowly approaches 150V and usually doesn't go above an operating voltage of 130V but yesterday I had to turn them off for maintenance with my batteries - nothing to do with the arrays. Yesterday there was some snowfall so this morning I got all the panels cleared and today's weather is roughly 10°F with snow-covered grounds and the sun is beaming bright and I'm getting huge production from other strings without issue. Is there any workaround for this scenario, like something that will throttle down the voltage slightly instead of me doing something like removing 1 panel as a temporary mitigation? Ultimately I can deal with this as it just seems to be two separate arrays that are going over-voltage and the other 10 are doing fine, but I'm interested in any suggestions anyone may have.