D. E.Survey on USB-C cables
I checked several USB-C cables concerning voltage drop.
I set my electronic load to 2A and switched the Supercap Pi USV on with charged capacitors.
Keep in mind that if they are empty, the charge current of 1A adds to the 2A!
This measurement again shows that the only good supply solution is to use the official Raspi 4 power supply.
| Cable Type | length | Voltage drop |
| Orzly® Neue Zertifizierte USB 3.0 Kabel (Amazon) | 1m | 340mV |
| Xaomi Mi9T pro cable | 1m | 610mV |
| USB Typ C Kabel, RAVIAD (Amazon) | 0.5m | 420mV |
| USB Typ C Kabel, RAVIAD (Amazon) | 3m | 650mV |
| Official Raspberry Pi 4 USB-C supply | 1.5m | -70mV (Voltage at USB-C connector of the Supercap Pi USV was 5.07V) |
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