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| 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.
Array Testing outside
Since everything seems to work isolated, we are going to test each mppt connected to an e-load/the battery outside. The first testing will be each mppt isolated and connected with an e-load to test their max power output.
The second testing will be a fully integrated test to see if the current going to the battery is sufficient for prolonged periods of time.
| MPPT# | Outside Conditions | Resistance of E-load | Voltage on E-load | Current on E-load | Notes |
|---|---|---|---|---|---|
| 1 | cloudy | 250 | 25.252 | 0.1012 | sun is not out will test rest later. also at a certain resistance the mppt goes into through mode, has 8w output, and when its not it has like 2W input |
Array testing outside rear in series
This testing will be conducted when the car is on and outside, and the mppts are actively charging the battery, which will be measured by a current clamp. All the mppts from the rear panel will be connected to the main battery pack, and the array will be facing the sun. The following table summarizes the test results.
| Weather/Outside conditions | Current Measured from array to Batteries | Notes | |||
|---|---|---|---|---|---|
Note: the car first had to fully turn on for the current path to be tested. This meant taking out the battery box and fixing one of the mppts becuase of a BMS fault that did not allow the car to shift from the aux power supply to the main battery pack.
Additional note: the car is still not working, so we are going to test it by putting 6 50W 150mohm resistors in series to get maximum power out from the mppts, and measure the current passing through the resistors in series.
TESTING OUTSIDE IN THE SUN 2 MPPTs IN SERIES
today we are finally testing the car outside by placing a dc load in series on the output of two mppts. THe eload will be placed on the output of the two mppts, and the following table summarizes the notes. We are testing mppt labelled 2 as mppt1, and mppt labelled as 4 mppt 2.
| Input Voltage mmpt1 | Input voltage mppt2 | Output voltage(oc) mppt1 | Output voltage(oc) mppt2 | Output voltage | Output Voltage | El-load voltage (oc) | Output voltage e-load | Output current on E-load | E-load setting | Weather | Notes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 19.84 | 19.84 | 26.98 | 26.96 | 24.612 | 21.89 | 53.863 | 45.95 | 1.108 | 41ohms | Sunny outside, array is facing sun directly | output current is kind of jumping |
| 19.84 | 19.84 | 26.98 | 26.96 | 26.054 | 21.92 | 51 | 0.885 | 51V | max power out from a 0.8amp current draw | ||
uplaod video from testing
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SPI Communication Testing of MPPTs
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