I have a big trip planned this weekend and I wrecked my TT this morning going in to a parking structure. Thanks in advance for your sympathy, but what I really need is your ideas on portable power as I'll be transitioning to tent camping with no power hookup.
I use a CPAP machine, and have an 80 amp hour lead acid battery, and a 100W solar panel and charge controller. The CPAP label says it uses 6.7A at 12V. By my calcs 6.7a x 8hr I need 54 amp hours which is just about the right draw-down for an 80ah battery. We'll be camped in a somewhat shady area but I think my solar panel can top of my battery during the day.
Do you suppose it's more efficient to
- use the CPAP's 12V DC power cord, attached to the battery with a cigarette lighter adapter
or
- use the CPAP's 110V power supply for the CPAP plugged in to the 300W inverter, attached to the battery
I'm leaning towards running on the DC power cord. Surely there will be losses going from the 12V battery to the 110v inverter, then through the CPAP's 110v power supply back to 12V.
amIright?
I use a CPAP machine, and have an 80 amp hour lead acid battery, and a 100W solar panel and charge controller. The CPAP label says it uses 6.7A at 12V. By my calcs 6.7a x 8hr I need 54 amp hours which is just about the right draw-down for an 80ah battery. We'll be camped in a somewhat shady area but I think my solar panel can top of my battery during the day.
Do you suppose it's more efficient to
- use the CPAP's 12V DC power cord, attached to the battery with a cigarette lighter adapter
or
- use the CPAP's 110V power supply for the CPAP plugged in to the 300W inverter, attached to the battery
I'm leaning towards running on the DC power cord. Surely there will be losses going from the 12V battery to the 110v inverter, then through the CPAP's 110v power supply back to 12V.
amIright?
Comment