Generator Nerds: AC Unit Tripped off BU in Outage

[Charlie Work]

• Installed Generac 24kw 2 years ago...
• outage this weekend was 1st time needed in a lights out
• ran fine for 5+ minutes till both Trane AC units kicked on
• tripped off Gen with a 1902 undervoltage Code
• Generator restarted & ran fine for 5+ till AC's kicked on & tripped again
• repeated sequence once more till the 3rd time locked it out.
• reset Generator & entire sequence repeated
• disabled AC units, reset Generator & it ran fine
• enabled smaller AC & the Gen stayed in
• enabled larger unit & Gen tripped
• swapped sequence & turned large unit on 1st & it tripped
• had a Generator Tech out today to troubleshoot
• propane flow was good under load
• Tech repeated what we did & got same results
• checked the 2-Trane AC unit nameplates & got the bad news
  • large AC has a startup current of 125A with a running current of 16A
  • small AC is 85A/13A

• Tech suggested a soft start setup for the AC's
• HVAC said they'd install it if we buy it, but, might void the Trane warranty...is that correct ?
• Tech said there was no way that he knew of to extend the under voltage circuit timer to ride out the inrush for a few cycles...is that correct ?
• anyone have experience with soft start systems ?
• for "buy a bigger generator" dude...no, I'm not buying a 36kw just to ride through a 1/2 secondish inrush current

 

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