So, the usual wall-wart or power brick adapters that convert AC to DC, use a teensy amount of power when they are not plugged into a device on the DC side.
My question is, what about DC-DC converters? I’ve built a 12V battery bank and have mounted 12V accessory sockets (cig lighter style sockets) to use certain auto accessories, and it’s just convenient to use those plugs because they have inline fuses within.
I’m going to put in a little USB adapter that sits in the socket and puts out 5V in USB socket form. So this adapter is a 12VDC to 5VDC adapter.
I’m wondering if anyone has any info on whether a DC-DC adapter as such would draw any power when nothing is plugged into the USB socket.