First I am using a deep cycle marine battery as a power supply when I camp & there is no electrical hook up. I have to do this because I use a CPAP to sleep at night. I have used this battery for a total of 3 nights straight with out recharging it & got a full 8 hours sleep each night.
I connect the battery to a power inverter & plug the CPAP into the inverter.
This year I am doing the whole week of RAGBRAI. I will be using the battery for a total of 8 hrs a night for 7 nights to power the CPAP. Because of this I am testing to see if it will last that long.
I also have a queen size air mattress I was going to use that uses an electric pump to fill it with air. I tried to see if the battery would operate the pump to inflate & deflate the mattress. After one inflation/deflation it was pretty much out of power. So I decided on a self inflating camp pad instead.
When the battery ran out of power after using the pump I put the charger on it & recharged almost right away. So my first question is why is that?
Also the mattress pump operates at 0.9 A. I do not know how much is required to get it up to speed, or the max amps, but I am guessing the 0.9 A is the continues running power.
The CPAP requires a max of 1.0 Amps to get up to speed, then levels off. I do not know what the continuous operating power requirment is, my guess is much less.
Right now I am running the CPAP off of the battery with out me using it. So it is just blowing air out of the mask. I will also test it with me using it as well. Because of my breathing there may be a differance in power consumption to keep the CPAP operating at the required level. So far the battery is going strong as expected. After tonight it will have power the CPAP for a total of about 3 hours, with many more to go.
Why is it the battery has no problem operating my CPAP, but runs out of power when operating the mattress pump?