Ryan said:
http://cgi.ebay.com/NEW-POWER-INVERTER-12V-DC-120v-AC-2000-4000-WATTS-/140441363967?pt=LH_DefaultDomain_0
Just wire this puppy up to your vans battery ^^^^
Be sure and leave the van RUNNING while you use it. An idling van shouldn't use much more gas then a generator and that's one less small engine to fook with.
That ebay listing makes a good point - current draw is a major consideration if you're thinking about an inverter. Look at the listing for the recommended fuse size - 500A!
Figure about 10 times the nameplate amps will be drawn from the van's battery. A typical 1200W iron draws 10 amps normally, so will draw around 100 amps from your battery. This implies a permanently installed inverter with heavy cables and proper fusing. You will be able to draw no more than around 250 watts from the cig lighter before blowing the fuse.
Keep in mind the alternator will not produce rated amps at idle, so even if you have a 100A alternator, you will be discharging your battery - even with just an iron. Not a problem if you just use it for short periods.
The problem with a 175 machine is the start-up amps. A 1.5hp buffer draws 13-15A running, but draws 3 to 5 times this for a short period on start-up. At the battery this translates to 130-150A running and upwards of 500A at start. Most cheap inverters will not handle this load and will fault out. If you intend on running your floor machine plan on spending some $ for a decent inverter and pro-level install.
Some service trucks I have seen have an inverter/auxilliary battery bank setup with a battery isolator switch wired to the van's battery. They can run the aux batteries into the ground if they want without killing the van.