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if I'm going to be running off an inverter, that's even more reason to have a big alternator. The inverter will suck a lot of power and you have to de-rate the alternator a LOT to account for it's power output at idle. A 350-400A alternator is rated at 200-250A at idle I'm planning for two...

found this discussion via google. I'm looking to replace the alternator on my ford van with a high power one (so it has enough output at idle to run an inverter for computers and power tools), and want to see if I can shoehorn in welding capability as well. I've been looking at 350-400A...