I recently commissioned a large system and saw something very similar. Is
it possible that there is a minor amount of shading on those modules? Maybe
weeds growing up or powerlines? When I had noticed that cell pattern, it
took a little bit to realize that there were powerlines just
I consulted and did some independent tests with a module manufacturer who
had some modules with low Power output and curve traces similar to yours.
They however could detect no abnormal cracks in the modules with EL
testing. I also detected no issues on the thermal image at no or low power,
What make of panel please. Forgive if I missed it...
Dave Angelini Offgrid Solar
"we go where powerlines don't"
text 209 813 0060
> I have been studying IR diagnostics quite a lot, but I haven't had a whole
I've checked several PV modules under load in past years and they all
seem to do this.
Just cell mis-match I was guessing.
On 5/17/2018 3:19 PM, Corey Shalanski wrote:
On a recent utility-scale PV installation we noticed a strange
phenomenon on a single string on a single inverter. An
I have been studying IR diagnostics quite a lot, but I haven't had a whole lot
of opportunity to "get my hands dirty" with it, so I'm not sure how much help
I'll be. I would like to know how many modules are in each string.
I'm going to share some random thoughts on this, but nothing
A dampening of the knee of the IV curve would be indicative of higher series
resistance. The higher series resistance would also increase cell temperatures
as shown in the thermo image. The cooling off of the cells under open circuit
conditions would also correlate to the higher series
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