Just wire something like this on the hot line of the incoming 110V. The hot line will be the one that gives you 110V to ground.

Make sure you use a heavy gauge core 10Ga or better SO cord (or solid copper) to the wall and if you can you may want to skip a plug, remove the outlet and hardwire it straight to the wall. At 15A a 110V plug will get really hot even if it's rated for it.

Setting it up to test it and seeing what it actually draws will be important. Then you can decide how best to do it safely and not burn your house down.