BlueRidgeMark
Addicted to ArboristSite
Patrick62 said:watts divided by volts gives amperage.
Even the little one (500 watt) will use 41 amps off the truck battery.
Double that for the kilowatt model. then add 25% to keep the battery charged. If you actually have a 100 plus amp alternator, go for it.
-pat
Don't forget to use adequate wiring. You'll need at least a 10 guage wire for the 500 watt model, and if your length is much more than 10 feet, you probably ought to go up to 8 guage.
Handy reference: http://www.powerstream.com/Wire_Size.htm