Dp26 wrote:
...I went with a portable cpap batt. I can get about 14 to 18 hours cpap on the portable. Cheaper than adding more house power, ...
Yes, the portable does seem to be cheaper than adding more house power. But how do you recharge the portable?
My house batteries recharge from the truck engine; I have no solar, no generator, and rarely any shore power. I am not sure if I could recharge both the house batteries and a portable CPAP battery from the truck at the same time.
I carry a Duracell 600 Portable Power unit to be used for non-CPAP purposes (light, charging small electronics) if needed. Such use would have to be planned in advance in a situation where I wanted to stay longer than usual in one place and wanted to conserve the house battery power to use for the CPAP. Conservation: minimal water pump use, LED lighting, minimal heater use, 3-way refrigerator.
My house system is 2 6V AGMs. They normally provide power for both house use and CPAP with humidifier for 3-4 nights without taking the stored power down too far. In cold weather, they would probably not do this well. 3 years of CPAP use and maybe over 100 camping nights, no problems so far.