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This test will determine the power out of the arrays at 12pm on a cloudy day (to be repeated on a sunny day) the test will simply put each section of the array in constant resistance mode, and measure the output voltage and current (essentially the power). The eload will be set to 1kohm in constant resistance mode then again at 10ohms.
| MPPT # | Resistance (Load) | Voltage | Current |
|---|---|---|---|
| 1 | 1000 | 15.918 | 0.01533 |
| 1 | 10 | 0.671 | 0.0667 |
| 2 | 1000 | 15.937 | 0.1553 |
| 2 | 10 | 0.731 | 0.073 |
| 3 | 1000 | 16.332 | 0.0161 |
| 3 | 10 | 0.745 | 0.0742 |
| 4 | 1000 | 16.437 | 0.0161 |
| 4 | 10 | 0.866 | 0.0863 |
| 5 | 1000 | 16.591 | 0.0159 |
| 5 | 10 | 0.833 | 0.0831 |
| 6 | 1000 | 16.563 | 0.0159 |
| 6 | 10 | 0.931 | 0.0929 |
To conclude this testing, the only way that the cells are the point of failure is if in direct sunlight they still do not have a sufficient power output. I will try to test this, however it is winter so getting the car outside may be a little tricky. Also note in this lighting condition, using the 240W bulb did not improve the voltage out by more than 1V, so the lighting conditions right now are similar to the bulb.
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SPI Communication Testing of MPPTs
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