DrewE wrote:
The inverter/charger will power stuff directly just as the converter does. In both cases, they're connected in parallel with the battery, and on average will power the house loads (and reduce the charge rate to the battery) up to their current limitations. Of course, it's not really possible to tell exactly where any given electron came from, whether the battery or the charger/converter, even if you could identify them individually.
It should be a reasonable upgrade, I think. I would consider installing a 12V outlet for the CPAP machine—it would be more efficient than going via an inverter of any sort, and the installation isn't all that difficult. The hardest part is physically running a wire.
By the way, your battery bank is 300 Ah, not 300 mAh—perhaps that's just a typo. That's about 3.6 kWh total energy storage (at a nominal 12V), if those are easier units to work with.
Thanks! Yes, I meant Ah...I've been working with some LiPo RC batteries this morning and had mAh on the brain. :) I have a 12V outlet that I purchased to install, but the bed is on a rear slide and I just haven't taken the time to think out the cable run since there isn't an obvious path. I had a 120 plug in the ceiling near the bed so I figured it was easier to just use that with the inverter. I'll give it more thought...if I'm going to be in the electrical anyway, I might as well install the 12V outlet as well.
Since my Lifelines can handle more amps during charing, I'm considering this inverter/charger: http://www.donrowe.com/KISAE-Abso-2000-p/ic1220100.htm
This one looks interesting as well, but it's 55A: http://www.donrowe.com/Xantrex-807-2055-Freedom-HFS-2000-p/807-2055.htm