Effect of heat on A/Cs and generators

Question

Does anyone know or know where to find the effect of heat on the performance of portable generators and rooftop air conditioners?

I know that heat degrades the performance, or makes it harder for them to work, but I have no idea as to how badly. I know I can run my A/C on one Honda 2000i generator in 80 degree weather, but it takes two 2000i generators in parallel to run it in 95 degree weather.

Whether that's the generator, the A/C or both I don't know, and would like to. I've Googled and Googled this matter and found nothing, may not be using the correct search terms.

Thanks for whatever attention you can give this.

popeyemth · Answer

Heat make the head pressure increase on the AC so it takes more amps to start it
To many variables to creat a chart of the different amps needed including humidity voltage efficiency condition wind etc etc

matt_colie · Answer

Yes Pop, It is called the Mechanical Engineer's Handbook.  It will take a little study, but it is all there.

popeyemth · Answer

You're pretty good at understatement :)I can see where the individual variables could be tracked with a "little study" but the results when you combine the variables and the shifting conditions during the day/night....you would be more than an engineer,you would be genius.A lot of work (years?) to satisfy a passing curiosity .That's all I was telling the OP.

semperfido · Answer

Amen.

"Well, Son (to use the short versoin), I'm wondering if you could tease out the relevant parts and let me know. You appear to be quite conversant with the subject and material, and I'd regard it as a favor.

"I certainly appreciate your willingness to share your expertise, would appreciate it more if it were done in a meaningful, useful way. I'm positive you weren't just putting the shuck on me and do know your stuff.

"I'm quite impressed so far. Thanks for whatever attention you can give this."

Regards,

Pop

wayne_dohnal · Answer

I can report that at 3,500 feet and 70 degrees my eu2000i will supply its 1,6000 rated VA output for longer than I was was willing to continue measuring it.  At 95 degrees the 1,600 VA holds for about 3 minutes, then the maximum output decreases to the 1,400 VA ballpark.  At 95 degrees and 500 feet elevation, it will hold 1,600 VA indefinitely.  So there are multiple variables, and it wouldn't surprise me if humidity was a factor, too.

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Effect of heat on A/Cs and generators

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