Page Comparison

MPPTs

29-06-2023: Preliminary MPPT Testing

• Tested one of the MPPT boards using a power supply (Sparky) and load (Rigol DL3031)

• Load set to 25V, power supply to 2A and set to ~8V (max 15V)

• Power output around 16W, an efficiency of ~91-92%

Conditions: cloudy, no direct sun, ~22°

• Replaced the power supply with a large solar panel

• Voltage around 6V and current 7.78mA

• Load: ~25V; 0.027A; 0.6-0.7W

• Another panel connected in series, power output increased to ~0.8W

• When the protective layer from the larger solar panel was removed, increased power output to 0.83W-1.0W

Note: large panel (28 cells) and smaller panel (16 cells)

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Validation - DCDC

05-2023

• During the test, the capacitor discharge circuit started smoking

• Once working, DCDC output max is 10.6-10.7V

17-06-2023

• R7: 549.5; R8: 4.715k; R9: 1k

  • So looks like R8 is off as it should be 10k

• TR to HV GR it's only 3.511kohms (should be a little over 15kR)

6-2023

• Replaced R8 to 10k ohms resistor, but seems like the resistor removed was 10k

• Connected back to the power supply and load no change in output voltage

PD

04-07-2023

• VBAT and 3V3 rails in working condition, 5V outputs 0.2V

13-07-2023

• tested a few times, working fine however the voltage lines incorrect

• split moment, drawing too much current at an extremely low voltage and smoke

• gound and power are shorted

• next steps: find the shorted component (the one that is smoking), use a thermal camera

Controller Boards

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Testing