Running a Desktop off 12v

So I live off the grid. Pretty much everything in my house runs off 12v. Except for the computer (currently an old laptop). I'm running into issues playing the mid-range games on the laptop so want to switch to a desktop with a little bit more ability. Laptop specs:



Windows Vista

160 GB HDD

4 GB RAM (the original speed was 533 MHz but I changed to the 4GB before I knew much about computers)

Dual-Core AMD Turion 64 1.6 Ghz

ATI Radeon Xpress 1100 iGPU



My current build:



Windows XP

Gigabyte GA-F2A88XIV-Wifi mini-ITX

Kingston Hyperx 2x2GB DDR-3-1866

AMD A-6-5400K 3.6 Ghz (iGPU AMD Radeon HD 7540D)

Laptop HDD and Optical Drive (had them laying around)



I know the PicoPSU is an option and I checked out the review of them here. However, the review doesn't include the PicoPSU-160-XT or the PW-200-M with the 192w adapter (12v/16A). Should I stick with the 19v adapters and get an inverter? Or am I good using the highly rated 192w adapter? Will my build fry the PicoPSU's? Should I get a low wattage PSU, extra batteries and an inverter?

Running a Desktop off 12v