I wanted to post this to see if anyone else has had this problem and if so, how did you overcome it?
When I brought my system on line in March, I was watching the SolarEdge monitoring app pretty close just because it was new. I quickly started seeing that the inverter was sporadically shutting off. When I was able to be at the inverter when it happened, I see an error code about DC detected on the AC side. Before it tripped, it was making a noise like a Geiger counter. All I could get out of tech support was that it's "grid distortion" and I should contact my utility.
Since I work in an engineering office, I talked with out power guys and found out that it was harmonics. Okay, now to find out where the harmonics were being generated. I knew that when we install VFDs at work, we use line reactors to control the harnonics generated from the VFD. So I picked up and added a 5% line reactor between the inverter and the breaker panel. This didn't help anything. The power guy in our office was able to get me a power quality recorder to monitor what was happening. I recorded for two days with the inverter off, two days with the inverter on between the inverter and the reactor, and two days with the inverter on between the panel and the reactor.
When I looked at the recordings, the voltage harmonics indicated that it was caused by the inverter since they went away when the unit tripped. I finally was able to talk with an engineer at SolarEdge and he made a commom sense suggestion that I hadn't thought to try. He asked me to wait till it was making the noise and start turning off breakers to see if I could make it stop. So I tried this and found out that when I turned off the living room lights, the harmonics went away.
Turns out that when I was looking for voltage harmonics I should have been looking for current harmonics. The problem was caused by several recessed lights with dimmable LED lamps. I changed the 8 LEDs back to incandescents and the problem stopped. The SolarEdge engineer suggested that this might be controlled by adding a motor run capacitor so I grabbed a 15 microfarad cap off the shelf and hooked it to a two pole breaker, removed the reactor that I didn't need anyway, and Was able to put the LEDs back in with no trips.
LEDs, especially the dimmable kind, tend to chop up an AC wave form and cause harmonics problems.
Greg
When I brought my system on line in March, I was watching the SolarEdge monitoring app pretty close just because it was new. I quickly started seeing that the inverter was sporadically shutting off. When I was able to be at the inverter when it happened, I see an error code about DC detected on the AC side. Before it tripped, it was making a noise like a Geiger counter. All I could get out of tech support was that it's "grid distortion" and I should contact my utility.
Since I work in an engineering office, I talked with out power guys and found out that it was harmonics. Okay, now to find out where the harmonics were being generated. I knew that when we install VFDs at work, we use line reactors to control the harnonics generated from the VFD. So I picked up and added a 5% line reactor between the inverter and the breaker panel. This didn't help anything. The power guy in our office was able to get me a power quality recorder to monitor what was happening. I recorded for two days with the inverter off, two days with the inverter on between the inverter and the reactor, and two days with the inverter on between the panel and the reactor.
When I looked at the recordings, the voltage harmonics indicated that it was caused by the inverter since they went away when the unit tripped. I finally was able to talk with an engineer at SolarEdge and he made a commom sense suggestion that I hadn't thought to try. He asked me to wait till it was making the noise and start turning off breakers to see if I could make it stop. So I tried this and found out that when I turned off the living room lights, the harmonics went away.
Turns out that when I was looking for voltage harmonics I should have been looking for current harmonics. The problem was caused by several recessed lights with dimmable LED lamps. I changed the 8 LEDs back to incandescents and the problem stopped. The SolarEdge engineer suggested that this might be controlled by adding a motor run capacitor so I grabbed a 15 microfarad cap off the shelf and hooked it to a two pole breaker, removed the reactor that I didn't need anyway, and Was able to put the LEDs back in with no trips.
LEDs, especially the dimmable kind, tend to chop up an AC wave form and cause harmonics problems.
Greg
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