Not sure if this is the one you have http://www.keypower.com/proddetail.a...&linenumber=15 From the looks of it, the spec is not that great for car use. The min voltage is 9V. some older battery will dip down to 8 volts during crank. You may have to get a tank circuit. It's only 60% efficient. 40% of the power intake turns into heat. Teamperture range is not that great for car use either. Those are pretty important to me when I look at DC to DC PSU. Where I live, the car interior can get to 130F-140F in just 15 minutes after parking in the sun during summer time. I have a bad battery that barely starts my truck but my PSU doesnt reboot the PC when I start. my PSU is over 90% efficient so I can run my PC at least 2 hours before it kills my dying battery. All those are really important to me ya know.