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Post by ThruTraffic on Jun 1, 2019 15:57:23 GMT
My panels:
4 50w mono
2 100w mono
I’ve been concerned that I wasn’t getting maximum wattage generation and that maybe I had a bad panel or wiring problem. While troubleshooting I took voltage measurements from each panel in good Arizona sunshine.
All of the panels except one of the 100 w panels would cause the meter to jump around a bit and then just long enough to see it display ~12v then ~18v, then the display would clear and then display a 1 to the far left.
The outlier 100w panel would immediately measure ~18.5v and the meter would hold that value on the screen.
This isn’t me not holding good contact with the probes. No way could that be the case consistently across the same panels over and over again.
Is there an explanation for this behavior?
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Post by bupkis on Jun 1, 2019 17:20:17 GMT
only use the good 100w.
probing for voltage you should get a steady almost 20v, if not there is loose connection in the panel, wires, terminations.
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Post by ThruTraffic on Jun 3, 2019 2:43:06 GMT
only use the good 100w. probing for voltage you should get a steady almost 20v, if not there is loose connection in the panel, wires, terminations. Maybe but it’s certainly questionable when 5 of the six panels are behaving this way. That’s a pretty odd percentage of bad panels. The 4 50w panels were installed in 11/2018. The two 100w panels were installed in 2/2019. Can’t be a bad batch. Renogy; can you offer an observation here? |
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Post by bupkis on Jun 3, 2019 15:39:50 GMT
youtu.be/JPb0b-s-Wfsyou should get a steady voltage Voc when testing panels, Isc (amps) is gonna vary with the sun.
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Post by Admin on Jun 4, 2019 16:19:43 GMT
only use the good 100w. probing for voltage you should get a steady almost 20v, if not there is loose connection in the panel, wires, terminations. Maybe but it’s certainly questionable when 5 of the six panels are behaving this way. That’s a pretty odd percentage of bad panels. The 4 50w panels were installed in 11/2018. The two 100w panels were installed in 2/2019. Can’t be a bad batch. Renogy; can you offer an observation here? Are the panels connected when you're getting these measurements? What are the unregulated figures you're seeing? www.youtube.com/watch?v=QMzkQi3DueE |
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Post by ThruTraffic on Jun 16, 2019 16:12:11 GMT
The voltage readings were a meter scale problem. Using two different meters I got the following data:
Panel Test Data
Panel Layout
- Panel Number 1 2 3 4 5 6
- Panel Wattage 50 50 100 50 50 100
- Voc (CL380) 20.33 20.38 18.79 20.26 19.88 17.87
- Isc (10031S) 2.29 2.29 4.21 2.33 2.32 4.39
Meters:
- Klein DL380
- Southwire 10031S
Panel Specifications:
50W
- Voc 21.8 V
- Isc 3.10 A
100W
- Voc 21.6 V
- Isc 6.24 A
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Post by Admin on Jun 17, 2019 21:21:41 GMT
The voltage readings were a meter scale problem. Using two different meters I got the following data: Panel Test Data Panel Layout - Panel Number 1 2 3 4 5 6 - Panel Wattage 50 50 100 50 50 100 - Voc (CL380) 20.33 20.38 18.79 20.26 19.88 17.87 - Isc (10031S) 2.29 2.29 4.21 2.33 2.32 4.39 Meters: - Klein DL380 - Southwire 10031S Panel Specifications: 50W - Voc 21.8 V - Isc 3.10 A 100W - Voc 21.6 V - Isc 6.24 A Your data is not too alarming. What kind of temperature was occurring when getting these measurements in AZ? -Renogy Team |
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