Need inverter info

I recently had to get a cpap. First concern was, what about camping? My wife said , you can make it work, whatever it takes. I did some research and found out that yes you can use your house or 12v battery but the recharge time is quite a bit. We camp with out power and generator use is limited to 2 hours in the morning and 2hrs at night. Not enough time to recharge the house battery. Next option I looked at was the portable battery offered by the place where I bought my cpap. It allows 13 hrs use without humidifier and heated hose. Best thing is that the recharge time is 2_4 hours. It is very compact, smaller than the cpap itself. Was 450.00 cdn. I have since done a test run at home. 8 hrs sleep, turned off humidifier and heated hose, recharged in 2 hours. I always use those but for camping to save power consumption I will not. It was fine as it was. It's a good chunk of change but well worth it.