Forum Discussion
deltabravo
Jan 29, 2023Nomad
Once upon a time I had a Progressive Dynamics hard wired EMS system in my AF 811.
It rejected generator power until I flipped a switch on its remote panel to disable one mode of its monitoring - open ground I think.
I always had to remember to flip that switch to use my EU2000.
One aspect of the hard wired unit that I despised, and a portable unit would surely do the same thing when plugged in to a smaller portable gen is this:
Any time my roof A/C compressor kicked on, the generator voltage would drop just enough to trigger the EMS unit to cut off incoming power (low voltage protect). When that happened, the compressor would of course be in a semi-locked rotor condition and would NOT start when the EMS re-enabled incoming power, so the voltage would sag again and the EMS would cut off power.
The ONLY way to get the generator to reliably run the A/C due to the issues with the hard wired EMS I had was to turn on my inverter, which would allow the inverter to carry the load of the A/C when the generator voltage sagged and caused the EMS to kill incoming generator power. Once the EMS re-enable incoming generator power, the inverter transfer switch would enable and switch off inverter mode and then the generator would power the A/C.
For the above reasons, I never recommend using a surge protector (portable or hard wired) when using a smaller sized portable generator.
I had my AF 811 for close to 11 years. About 3 years before I sold it, I removed the hard wired EMS and ebay'd it.
It rejected generator power until I flipped a switch on its remote panel to disable one mode of its monitoring - open ground I think.
I always had to remember to flip that switch to use my EU2000.
One aspect of the hard wired unit that I despised, and a portable unit would surely do the same thing when plugged in to a smaller portable gen is this:
Any time my roof A/C compressor kicked on, the generator voltage would drop just enough to trigger the EMS unit to cut off incoming power (low voltage protect). When that happened, the compressor would of course be in a semi-locked rotor condition and would NOT start when the EMS re-enabled incoming power, so the voltage would sag again and the EMS would cut off power.
The ONLY way to get the generator to reliably run the A/C due to the issues with the hard wired EMS I had was to turn on my inverter, which would allow the inverter to carry the load of the A/C when the generator voltage sagged and caused the EMS to kill incoming generator power. Once the EMS re-enable incoming generator power, the inverter transfer switch would enable and switch off inverter mode and then the generator would power the A/C.
For the above reasons, I never recommend using a surge protector (portable or hard wired) when using a smaller sized portable generator.
I had my AF 811 for close to 11 years. About 3 years before I sold it, I removed the hard wired EMS and ebay'd it.
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