Or a car battery, quasi sine wave inverter....
I've done that. Unless it is a smart soldering iron, even a dumb square wave inverter will power it just fine.
The quasi sine wave inverters powered my Weller with temperature control, but it wasn't all that bright, it used a magnetic switch and the Curie effect to control the temp. A dumb square wave would probably have worked but all I had was a quasi sine wave.
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The Curie effect is the characteristic of magnetic metals to become non magnetic at some given temperature.?
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