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Amperage usage for Multi Stage Compressors
I am trying to get accurate amperage usage for a dual stage heat pump compressor. I know that the compressor staging is 70%/100% for stage1/stage 2, and the the nameplate indicates a single RL of 15.3 amp.
I just want to verify that the compressors amperage consumption for the stages is simple as 70%/100% of 15.3amp. Or does it not calculate out this nicely?
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That's not how it works. Ambient temperature and load along with many other factors affect amps draw.
It's more like a sliding scale with the 2 numbers you posted as the maximum numbers.
Just figure that high stage is X. And low stage is 66%of X.
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ah, makes sense. That actually makes my numbers even better if the compressor is averaging somewhere less than RL.
Heck, if I assume a 24 hour HP runtime (includes the outdoor fan draw) at an average of 70%, the electric cost equates to 6.4 hours of a pure 10kW heat bank. It really is surprising then why people lock out their HP's in the 30's when the HP is maybe only running 10-15hr/day.
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Yes I'm not much of a fan of locking out a heat pump until you hit the mid 20s.
We have fairly cheap natural gas here and the economic balance based on 95% gas furnace is actually 20 degrees.
My own place has only electric so I run the heat pump to about 5 degrees.
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A couple more very important notes : If you are going to lock out your HP during a cold spell make sure you have a working HP crank case heater. Defiantly a good way to a shortened life span of the compressor .
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As it gets colder outside, a heat pump compressor will draw less amps. It will also provide less heat. Theoretically, a compressor running in low stage on a warm day might draw the same amount of amps or more than it would if it were in high stage on a really cold day.
If at First You Don't Succeed, Skydiving Is Not for You.
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You can try to calculate till the cows come home, and, you might come close...... or likely not.
Why not install a couple data loggers and capture real time operating conditions?
Simple, cheap, and accurate.
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I like these from Amazon, you have to be sure it rated for outside use,:https://www.amazon.com/Current-Amper...18260022&psc=1
Originally Posted by
Artrose
You can try to calculate till the cows come home, and, you might come close...... or likely not.
Why not install a couple data loggers and capture real time operating conditions?
Simple, cheap, and accurate.
Philippians 4:13
I can do all things in him that strengthen me.
Apostle Paul inspired by GOD.
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Originally Posted by
Artietech
Unfortunately, this thread died a while back.......have to maybe assume the OP found his solution, or gave up....but at any rate....here's another link for data loggers .....
https://www.onsetcomp.com/products/d...hoCCgkQAvD_BwE