Posted by KEB1 on February 21, 2011 at 15:02:58 from (192.91.171.42):
In Reply to: DC Welders posted by Mike (WA) on February 21, 2011 at 10:10:35:
"what kind of household stuff can you run on 110 V DC?" Incandescent lights, radiant heaters without blower motors, 110 volt electric stove elements...that's about it. Resistive loads and motors with brushes generally don't care; anything with a power supply, electronic controls, induction motors, flourescent lights, etc., requires AC.
At one time there were household appliances available that would run on 110 AC or DC, but they pretty much went by the wayside with the completion of rural electrification in the 1940's & 50's.
The typical consumer type inverter requires 12 volt DC input, not 110 volt DC. They're designed to run off a vehicle power supply. There are inverters avaialable with 24 or 48 volt inputs for solar power systems, but I suspect they'd cost more than a stand alone generator of equivalent capacity. I've never heard of an inverter with 110 VDC input, which means if they are avaialable they'd be a specialty item and therefore expensive....
A household refrigerator would probably require an inverter with a starting (surge) capacity of at least 1500 watts. I wouldn't even consider trying to run one that large off an automobile for more than a very short period of time, and then only off the battery unless you have a very large capacity alternator.
If cost is the primary driver, your best bet may be a used generator for backup power, and then buy whatever you need for a welder. Around here (Colorado) you see older generators on craigslist for a couple hundred dollars all the time, and some for a lot less than that if you're willing to work on them. I got an older Sears 1800 watt electric start unit for $20 off of craigslist, needed a new head gasket and the carburetor cleaned to run perfectly.
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