I wasn't aware that Airxcel had two motors in the AC/HP. They do not advertise it nor can I find any install/service manuals that reflect that in their line-up. I did not look through all of them as they have a lot of different products.
I don't know if it's industry standard (I don't work on this stuff for a living), but my Atwood came with a QA sheet that was hand-written with my specific unit's power consumption in amps for the various speeds/modes. Nice touch.
When my Dometic died I researched and replaced it with an AirCommand 15k by Atwood. I misunderstood the instructions (actually, I decided I was smarter than the wiring diagram included and paid the price) and fried the control board. I ordered it through Atwood direct, no hassle, and replaced without issue. I've had limited use of it but I do like it better. It's much more quiet, cools better then the 13.5k I pulled off (which it better!)and the heat pump feature is a bonus.
Additionally, it's more generator friendly. My 13.5k struggled at my home at 5500ft asl on a Yamaha 2400ishc. I installed the same hard start cap on this 15k that I had on the 13.5k. Not only does it barely bother my Generator, I am able to start the A/C and run it from my Prowatt 2000 (3k surge) inverter.
The design is better, in my opinion, and shows that someone with some HVAC engineering experience might have got their a but more with the accounting department. It uses two ECM motors instead of a single PSC motor like all other RV A/C units do for the condenser and blower fans. The insulation had an appearance of a better install, and the control system is more "high-tech". The shroud attaches better than my original unit with four stout screws vs the 1+ million tiny screws of the previous unit. The unit is noticeably more quiet then the old Dometic unit on the outside of the RV as well, as the compressor and fan combo hums at a more pleasant frequency.
What I don't like:
1. The fan runs 100% of the time in A/C mode as the compressor cycles off. It does select low speed fan mode, and it's not horribly loud, but I would like it if it would just turn off.
2. The thermostat uses a special communication protocol making it the only thermostat you can use with this unit. The interface is kinda big, and not my favorite.
3. The shroud design looks kinda old/goofy to me when up close to it. On the ground looking up you don't really care and doesn't look out of place.
4. Like most heat pumps, don't rely on it in super cold weather. I've not been able to get it to fire at less then about 45F. Not really a show stopper for me, but the manual doesn't specify what the lowest operational temp is for the heat pump. I was pleasantly suprised at how warm the air is when it is running.
All that said, only had the unit since August, so time will tell.
I have a commercial B45 Keurig I picked up for free, and 4 GC2s w/ a Xantrex Prowatt 2Kw Inverter. Wiring is very short and 000. I also have a Victron Ammeter. I also just ran this a week ago to see the draw on the batteries. The b45 is a little slower to warm up then the other consumer grade versions, but this model draws 115amps for about five minutes, and then every minute or so will draw 115amps for about 3-5 seconds.
I wouldn't leave it running while you aren't actively making coffee due to the fact that it's power hungry just keeping the water ready. However, with my setup it will work fine for us, but I am not sure it's worth it. You can get a Presto MyJo (there are other brands too) which is like a coffee press but will take Kcups. I have one and may just use it instead of wasting my time/effort recharging batteries more often.
I replaced my Dometic (died in 2 years) with an Atwood. I even had to buy a new control board since I hooked it up wrong and was able to get parts no problem. The unit is much more quiet, the 15k comes with a heat pump too. The fan doesn't turn off (that turns some people off), but goes to such a low speed that it doesn't bother us. Power usage is way better, I can even run it off of a Xantrex Prosine 2000 on my 4 Golf carts for an hour after installing a Hard start cap I had put in the Dometic.
I am not sure how the insides of a Dometic or RVP/Coleman that aren't "builder grade" look, but the Atwood had insulated linesets, the duct insulation appeared much higher quality and better engineered, and it came with two seperate fan motors for the Condensor and blower unlike the Dometic and colemans I've owned/seen.
I did upgrade from a 13.5k btu to a 15k when I bought the Atwood, but I feel it cools better than if I would have just bought a Dometic 15k. No data to back it up though.
My Errin provieded 100Amp adjustable Maxes out my Yamaha 2400ishc. The adjustable voltage feature makes for the best charges even when at high-altitude and the 2400ishc can't keep up for more than a few minutes at 94+amps.
I marked mine when I first got it based on a recommendation I read in a previous thread of yours.
Love these converters.
My Dometic 13.5k A/C just died over vacation 2 months ago. Worked okay then suddenly wasn't cooling much if at all. I climbed up on the roof and saw oily stuff all over the compressor which was still running. Something sprung a leak. Just replaced the unit myself since these things are pretty much non-serviceable. I hope your luck was better than mine.