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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 ~0.6W8W
When the protective layer from the larger solar panel was removed, increased power output to 0.83W-1.0W
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Note: large panel (28 cells) and smaller panel (16 cells)
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DCDC
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VBAT and 3V3 rails in working condition, 5V outputs 0.2V
13-07-2023
split moment I saw, drawing too much current at an extremely low voltage