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MOD Micro-Air EasyStart for RV air conditioners

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Neal

Staff member
RVF Administrator
Joined
Jul 27, 2019
Messages
11,477
Location
Midlothian, VA
RV Year
2017
RV Make
Newmar
RV Model
Ventana 4037
RV Length
40' 10"
Chassis
Freightliner XCR
Engine
Cummins 400 HP
TOW/TOAD
2017 Chevy Colorado
Fulltimer
No
In the summer of 2018 I decided to configure my Class A Motorhome guided by @Chuggs to be able to run the front AC on solar. With 1800W of solar on the roof and a 100A Victron 150/100 tr solar charge controller already installed I was ready to be the guinea pig for one of Charlie's next inventions. I installed a 3 position switch near the circuit breaker panel that allows the power for the front AC breaker to source either off of shore power or the inverter. The inverter being powered by alternator + batteries with solar providing the current for the batteries (charging while use). One item required to make this happen was the installation of the Micro-Air EasyStart. First off, installation does not void or affect the Dometic warranty. Per the Micro-Air web site I found an installer not far from me that did the work. It wasn't that expensive to have installed but did take some time for various reasons (he bumped some dip switches which took a call to Dometic to sort out) but also a learning cycle you have to put it through which is 5 cycles of a 2 minute AC run followed by a 5 minute off interval. The placement wasn't ideal by the installer but it worked, Charlie installed on his and found a much better way to do so and maybe if he remembers how to install this he can reply with the instructions for others to follow as I sure don't remember. I followed Charlie's instructions and installed on my 2nd roof air conditioner and it went very smooth, took about 30 minutes and wasn't hard at all.

Prior to using the Micro-Air EasyStart such as if being powered by your gen you would hear your gen load up with the AC spikes with the startup load. With the EasyStart you don't get that startup spike of around 120 amps so the gen doesn't even load up and for this reason you won't hit low battery cutoff (LBCO) in a solar powered AC scenario. They are amazing and when your 50A coach is connected to a 30A shore power setup you most likely will not load shed. I was able to run both AC's just fine on 30A among the other items in the coach.

Check it out. Great thing to install for your AC's for various scenarios.

 
Seriously thinking about doing this mod. It just makes sense to me.
 
B4424141-D6D7-4254-AEAD-24F66FB6E23B.jpeg

Here’s a wiring diagram for our Dometic Rooftop AC units...
 
If you install it yourself...the instructions are pretty easy to follow.

I would recommend the installation kit add-on to keep from having to run to the parts store.

wire stripper, screwdriver, cutters, crimper...


I found the plastic molded shrouding wasn’t fitted together properly...so having some duct tape to properly seal the gap is nice. You also have to route the wiring harness thru a shroud...some duct seal (grey silly putty looking stuff) is handy for sealing the wiring routing thru the shroud.

Takes no time at all to install...It takes some time to go thru the programming...turning the A/C on/off Thur a series of cycles...
 
I am getting code E 7 which is low voltage when my ac tries to turn on. Please help.

Thanks
 
E7 on mine usually means I left the Dometic units on when switching or removing power.

Go from one end to the other... Power Pole Breaker or Generator Breaker...PI surge protector clamping due to a fault...Main distribution panel...A/C 1,2 &3 20A breakers, too high a load causing the Precision Circuits to cut A/C (I don’t think this will cause an E7 since it’s a command to the Dometic control box...not an actual AC power cut out. Loose connections, bad capacitor, and if you have a Micro Easy start there is a way to reset and reprogram it to relearn your compressor starting loads.

Can’t think Of much else...
 
I am a failure at telling my story. Every thing off but frig and back ground stuff . power for front ac switched to inverter . Turn on front ac only. Get E7 want run.
 
power for front ac switched to inverter

So you have your front AC wired up like @Chuggs and I to run the front AC off of solar? It sounds then like your inverter breaker has tripped. Are you getting power to other inverter outlets in the coach?
 
Does the A/C work when switched to Line power vs inverter?
 

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