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Didn't tell whole reason for making choice; Started separate thread as not to take away from performance test.  The inverter technology does not have the start up surge of the roof tops. The 12000 BTU 9 amp is constant. These are heat pump units the vary speed of fans and compressor as to demand of your thermostat. 9 amps is max.  Hard to get used to when you first start them you think they are broken.They start slow and ramp up slowly to speed-both fan and compressor.  Max inside decibel on the 12000 is around 40.  much quieter than the roof tops that are not ducted. When you temp setting is reached the units decrease the fan &compressor speed to almost quiet until needed again then ramp up as needed. I haven't noticed then over 1/2 speed once temp has been reached.            Point being   when at a 30 amp service with roof air was challenged to do more than run one plus everything else.  Roof air pulling up to 20 amp on start up and 14 running.  Two mini-split (12000&9000)running= max 16 amp running and no surge.  Thru testing I know two minni split will keep my bus 70 on 100 degree day and one roof top would not keep it but 80+.  I'm not a inverter guy---food for though---no surge ---low amp draw--.    Bob

Hi again, Bob.

I have two mini-splits (Your fault!  ;D )

Here is there tag for amps, etc.

Same basic units. Mine are a little differant in that they use 410 refrigerant and are inverter technology. That said all not that much difference other than start up.  Have you tried them out yet?  I do hope they serve you well. Please do report negative or positive!!  Bob

By the way, we have also been working hard on insulating floors, walls and ceiling to the best of our ability, to make both heat and air as efficient as we can. Of course, I also understand that the windshield and other glass makes up a lot of lossy surfaces for both heating and cooling.

We have the 3,000-watt inverter (45-amps peak @ 110 volts), so I figure we could run the two A/C units going down the road off the house batteries, without too much problem, while they are being charged off the engine's generator via the battery isolator. Of course when it is just the two of us, we probably won't need but one at a time.

Quote from: Mex-Busnut on December 11, 2011, 07:34:15 PM
By the way, we have also been working hard on insulating floors, walls and ceiling to the best of our ability, to make both heat and air as efficient as we can. Of course, I also understand that the windshield and other glass makes up a lot of lossy surfaces for both heating and cooling.

We have the 3,000-watt inverter (45-amps peak @ 110 volts), so I figure we could run the two A/C units going down the road off the house batteries, without too much problem, while they are being charged off the engine's generator via the battery isolator. Of course when it is just the two of us, we probably won't need but one at a time.

    Steve, I haven't gotten there yet but it looks like good insulation is one of the biggest things.  And I've also been told that when you're running down the road with afternoon sun in your face in the summer time, you're going to need LOTS of air conditioning capacity.  I will be very interested to hear how your system works - please keep us up to date!   Thanks,  BH