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TOPIC: Question Transformer problems, Output 15.8volt not 12 Volt

Transformer problems, Output 15.8volt not 12 Volt #769

  • billi2
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Hi, I have just wired 2 x 12 volt outlets to allow us to charge our phones overnight. I wired them into the 12 volt light circuit and foolishly did not check the voltage just assumed it would be 12 volt.
When I put an 12 volt USB adaptor it fried immediately. So in a genuine male approach I then checked the voltage and it was 15.8 volt with nothing else on and 14.3 volt with the internal lights on.
The 12 volt lights seem to work OK, I have not tried any other appliance to see if they work.
Can anyone comment about the sensitivity of a USB charger adaptor to the extra few volts. I am goint to try a 12v-24v USB adaptor to see if this copes.
Also the sockets are wired centre positive, outer housing negative, I believe this is correct polarity

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Transformer problems, Output 15.8volt not 12 Volt #770

  • Garry
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No eBay APP ID défined in Kunena configurationHave you thought about a solar portable phone charger like one of these on ebay?



You can have it charging the battery bank in your van, and later on pop your phone onto it, and charge it from the inbuilt battery overnight.

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Last edit: by Garry.
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