Originally Posted by Zephod_beeblebrox2
I saw a neat gizmo in Kmart yesterday - a box that plugs into a cigarette lighter socket that purports to heat and cool. It called itself a traveler 3. Probably worthy of further investigation.
just remember the basic rules:
heat takes energy, watts are "heat"
so if it is plugged into 12v circuit, at say typical vehicle with a 10 amp fuse
using 8amp as safe that is only a 96-ish watt heat source, wont do much
it will heat
most of those are gimmicks, you can run a dedicated 12v line with fuse to power a 800 watt inverter, then you can use a small (less than 800wt) heater, still small tho
I have been using $99 cobra 2000wt invertors for 5+ years (truly only about 300 hrs a year guessing) never an issue, I have them sized at 1750watts which gives me a nominal 14 amps of power, they can surge to 2500wt for compressor kick ones
remember to size it to about 85% of your needs and you'll be good
we have them in every vehicle, hair driers, irons and crockpots are big users
look at your stuff "that makes heat" it will have a wattage on it, take that number and divide it by 120v and you can see what you need