Testing running roof air via inverter
Testing running roof air from the battery bank with minimal solar. Equipment: Magnum 3012 hybrid inverter powered from 556 amp-hours of telecom batteries Dometic 13500 BTU roof air from 2005...
Forum Discussion
Hi Rolling Condo,
I'm pleased to have threads morph, so here is what I have seen.
I posted on a thread about the Microair.
Start up surge, in my case, went from over 50 (on an analogue meter), to under 17. I used a digital meter as well, but it was not "fast" enough to catch the surge. The digital meter showed a surge of 17 before the Microair was installed, and about 15 afterwards. My unit did have a hard start capacitor in place as OEM.
There are "double" surge events as the Microair unit starts the fan inside the RV first, and then the compressor. The newest version, (which I have) has short cycling protection for the compressor. I.E. if the AC attempts to start before a 5 minute window, then no energy is sent to the compressor (the fan does run, however).
Running power consumption remains the same. In my case, that is between as little as 1200 watts and as much as 1900 watts.
The Microair does not do power factor compensation, but will work properly with units where that has been added.
The RV is currently being powered by one leg of a 50 amp outlet in a rural area. I am using a Sola Basic autoformer to keep voltage up (boosts from 113.5 to 118.2 volts). Without the autoformer voltage would be too low for my comfort zone to run the AC.
The Magnum 3012 hybrid inverter charger is set to limit incoming current to 30 amps. The Magnum is NOT set for doing "load support", though I did try it after the testing of running the AC from the inverter/battery bank. The Magnum did not go to load support.
The Microair does sometimes seem to delay the autoformer from going into boost. On my last visit to this location, the autoformer would boost the voltage before the compressor and fan motors had gotten up to full speed.
There are reports of running a 13500 btu AC with a Honda 2k unit with the eco switch turned off, but those reports do not record the voltage when the roof air is operating.
I'm pleased to have threads morph, so here is what I have seen.
I posted on a thread about the Microair.
Start up surge, in my case, went from over 50 (on an analogue meter), to under 17. I used a digital meter as well, but it was not "fast" enough to catch the surge. The digital meter showed a surge of 17 before the Microair was installed, and about 15 afterwards. My unit did have a hard start capacitor in place as OEM.
There are "double" surge events as the Microair unit starts the fan inside the RV first, and then the compressor. The newest version, (which I have) has short cycling protection for the compressor. I.E. if the AC attempts to start before a 5 minute window, then no energy is sent to the compressor (the fan does run, however).
Running power consumption remains the same. In my case, that is between as little as 1200 watts and as much as 1900 watts.
The Microair does not do power factor compensation, but will work properly with units where that has been added.
The RV is currently being powered by one leg of a 50 amp outlet in a rural area. I am using a Sola Basic autoformer to keep voltage up (boosts from 113.5 to 118.2 volts). Without the autoformer voltage would be too low for my comfort zone to run the AC.
The Magnum 3012 hybrid inverter charger is set to limit incoming current to 30 amps. The Magnum is NOT set for doing "load support", though I did try it after the testing of running the AC from the inverter/battery bank. The Magnum did not go to load support.
The Microair does sometimes seem to delay the autoformer from going into boost. On my last visit to this location, the autoformer would boost the voltage before the compressor and fan motors had gotten up to full speed.
There are reports of running a 13500 btu AC with a Honda 2k unit with the eco switch turned off, but those reports do not record the voltage when the roof air is operating.
Rolling Condo wrote:
Not trying to change direction of this thread. But I'm very curious about real numbers on the A/C side of the air conditioner with the Micro Air installed.
If anyone has information I'd like to hear about it.
Thanks
