If it's pure sine the heating elements should be ok and for that price it seems to be a pretty cool portable power supply if it's powerful enough to drive what you need.
I have a battery powered jacket by Milwaukee that lasts several hours on a small battery pack. For extra run time I purchased a few more tool/battery combo units. The tools are handy and didn't cost much more than the bare batteries.
The cool thing about Lithium 20Ahr is that you can get reliable life out of it near full use cycles vs 50% capacity cycles from coach batteries. The portability is priceless! Especially for the use you describe
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