I have a pack of 5 and I only use 1. I use this to power a Raspberry Pi 4 with a Pi Camera on a 24V power supply for 3D printers Power the USB wall charger with Octopi but I can't get them with this one. The voltage is less than 5 volts when the pi 4 is connected via USB power meter. The Pi doesn't take the full 3 amps. I expect the voltage to be even lower when drawing 3 amps. The polarity of the inputs is not marked but not difficult to determine. The negative input has continuity to the output ground.
Efficient And Convenient EV Charging With MUSTART Level 2 Portable Charger (240V, 25Ft Cable, 25Amp)
18 Review
MUSTART Level 2 EV Charger With 240V, 25Ft Cable, And Adjustable Amps (16/25/32) – Portable Electric Vehicle Charging Station With Delay Function And NEMA 14-50P Plug-In
29 Review
OEMTOOLS 24397 2.5 Gallon Manual Fluid Extractor Pump For Oil And Transmissions, With Oversized Handle For Easier Use And Extraction
23 Review
Portable Electric Vehicle Charger (40A, 240V, 25Ft Cable) - Level 2 EV Charging Station With NEMA 6-50P Plug-In For EVs By MUSTART
19 Review