If you're scared of wiring, the Jakery pre-built units are pretty cheap. Just add an MC4 adapter and panel.

https://www.amazon.com/Jackery-Portable-Generator-Explorer-Emergency/dp/B07FYJVFNK/ref=sr_1_5?gclid=CjwKCAjw6vvoBRBtEiwAZq-T1eH_-t8OOG0mpP22xLRBrosaAq6Pq2vi7MlPakJrqS2-6i0-D21rPBoCQMcQAvD_BwE&hvadid=241656681350&hvdev=c&hvlocphy=9030954&hvnetw=g&hvpos=1t1&hvqmt=e&hvrand=12357595626479094391&hvtargid=aud-647006051489%3Akwd-61772730782&hydadcr=26611_9892148&keywords=jackery&qid=1562386673&s=gateway&sr=8-5

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I prefer building my own but I know some people are worried about electrical

I found this one https://smile.amazon.com/gp/product/B07FYJVFNK that uses ~40% of the battery life a night (personal test) for my ResMed Mini. I'll have a solar panel with me to recharge it though. It sounds like the people at the medical tent are super helpful so I'm also toying with the idea of seeing if they'll let me drop it off for a recharge from a 110v outlet.