Good, I’m using your DTH on my HEM to monitor my washer, and it seems to work great. Thanks for putting it together!
Oh that’s for HEM, I thought it was for the appliance module in same post. I keep thinking about getting HEMs for clothes dryers ,but always another more pressing project.
Oh no, that link I posted is for my Aeon appliance module/switch . I used my code from the HEM to put that together. Sorry if that confused folks.
I just went to test this as I only have one HEM doing 110/120v. I plugged my Kill-A-Watt in, then an Iris plug, then the extension cord with the load that the HEM is reading. Results are:
6w Kill-A-Watt
7.1w Iris Plug
11.44w HEM
Would doing this change alter my readings for the better? I obviously can’t use the Kill-A-Watt or Iris plugs to test the 220/240v devices I have, so maybe all of them are reading a bit high…
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It be interesting to know if the variation is consistent with different loads.
I’ll keep an eye on it. Currently all three meters are reading load from the HEM itself, a freezer that cycles once every hour and a half or so, a garage door opener and a GoControl garage door controller.
I’m curious what the motor load from the freezer will do mostly…
And the freezer just fired up:
94w Kill-A-Watt
93.7w Iris Plug
88.66w HEM
So an inductive load measures less on HEM than a resistive load…?
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Did you figure anything else out related to this?
My brother, an electrician, says this won’t be the case as it’s just measuring actual amperage current. I honestly gave up on fine tuning it.
I’m currently battling a new furnace that is using 700-800 watts vs my 23 year old one that used 375. Even though it’s a high efficiency top of line model. My HVAC guys look at me like I was mad, then got interested when I showed them all my graphing and real time power monitoring. But they didn’t know why it shows so much more either. I need to contact Trane again but they keep trying to kick me back to the dealers…Always hate having contractors do work for me.
Oh man that sux. Why did you have it replaced? I just installed 320 95% (Gas) in a development and they are only pulling around 120 watts/hour.
It was old, over sized, and I wanted to add AC. Why add AC to an old unit vs just replace the whole mess at once is my thinking.
This is a S9V2 80k unit, the old one was 100k. The fan uses 135w which is exactly in spec, but the installers manual says max of around 400w for the blower on full, I have it set to it’s lowest. Static pressure test is .4 which is a hair high, but less than half the units suggested range. I’m personally thinking it’s the igniter staying on after the burners light. Since they don’t use a pilot light anymore, they heat up an element and ignite the gas. That has to use a lot of energy I’d think.
When the AC is on, the blower goes full speed and it uses 900w, which is insane.
Ironically the power draw with that and the AC itself (which is normal) is still less wattage than my old window AC units combined.
I think because the Iris Plug and kill a watt were calibrated properly for the current coil sensors. With the Hem, we just hook on the wires where we think is most convenient and easy also the clamp is hug so the tolerance is probably higher.
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