[Shop-talk] DC to DC PS/charger

[eric at megageek.com]

Have you thought about hacking apart an old UPS?  Just supply the old 
battery terminals with the 12v dc from your vehicle and you'll have 120v 
AC out.
You need to make sure you have heavy enough gauge wire and that the UPS 
can supply the needed amps.  But it can work and old UPS with bad 
batteries can be had for free.  (Oh, you can sell the used batteries to 
most scrap yards.)

Eric P
"Be as beneficent as the sun or the sea, but if your rights as a rational 
being are trenched on, die on the first inch of your territory." Ralph 
Waldo Emerson