I'm trying to find a dual output USB car charger to use to run my go-pro and an ipad in my 24V 172.

Does anyone use the Go-Pro Auto Charger on a 24V system? I called Go-Pro and they simply repeated that 12-24V was the input voltage spec... I'm hesitant to buy one and find out that it will fry my expensive toys when the bus voltage gets to 28V.

Any other ideas for a compatible dual output charger? I haven't been able to find one that clearly states it will work with a 24V system.

go pro is usb input - you need a dc adapter and most of them take 24V in just fine. Not sure about the gopro specific one, but these definitely do, and they will all work. I don't see a spec on the gopro web site, but I'm pretty sure that on the back of the package, or inside in the specs it will likely list 24V as fine - but that's just a guess.

http://www.sportys.com/PilotShop/product/19034

If your plane or car has a cig outlet, then just buy one of these cheap deals. They work for me. Not this specific one, but any dual plug usb car adapter. Im not a 100% or even 50% heck even 12.9% since Im not an Electrical Engineer, But I use these things all the time and never had any problems. Anything with a cig plug I plug and go. Never read into it as much I suppose. It works for me.


http://www.amazon.com/Cigarette-Lighter ... B000CC6I5W

I will be using my cigarette lighter, it just happens to be 24V. Many of the USB chargers I've found are rated for 16-18V max DC input voltage. All the higher voltage ones I've seen list 24V as max input voltage. So the question becomes, is 24V the maximum nominal voltage, or the maximum absolute voltage.

I imagine the USB chargers use a high frequency buck type DC-DC converter (a linear regulator would dump WAY too much power), and not knowing the max absolute voltage of the (presumed) buck IC, I'd hate to get in a situation where the (presumed) internal mosfet of the charger failed closed, thus applying a large voltage across the USB output.

The link to the one at sporty's looks like a winner. It is the only one I've seen that says it will actually work with a 24V SYSTEM. Thanks.