CPAP generator

Me and my husband are going to be tent camping 7 nights in Yellowstone and we both have CPAPs. So, obviously, we need a generator so that we can use the CPAPs. I'd like something quiet that can power both CPAPs for the entire night if that exists. I also don't think we'll have access to an outlet so we'll need something that can be charged with either a solar or car charger. Anyone have any suggestions?