My use case was that I wanted to run a carbon monoxide detector in my RV. It runs on 9v and my motorhome is of course 12v. I had a previous purchase that didn't work because when you charge your motorhome (connected to shore power) the voltage rises to just over 13 volts and the previous converter no longer works . I think it worked above 13 volts and up to 10 volts. I've only had the camper once and it seems to have served its purpose.
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