Hello,
I’ve been happily moving along with my two IotaWatts but since these things give a level of customization that’s above and beyond I wanted to dial in the accuracy.
When I first installed my IotaWatts I calibrated the voltage from 10.79 down to 10.75.
My last billing period showed that I was a net consumer of 374 kWh
During the same time the IotaWatt that measures the mains calculated 385 kWh
Which right off the batt is stunning accuracy!! Amazing job @overeasy!!
I want to get even closer because why the heck not! Does this math check out for further calibration?
[Old Calibration Factor] - (1 - ([PoCo Power Usage] / [Measured Power Usage]))
10.75−(1−(375÷385))
New Calibration Factor: 10.724025974
Either way I’m not sweating it because it’s already quite accurate for my use case.
Actually, scratch all of the above. I pulled my 15m data from my power company and added up the daily amount and compared it to my IotaWatt…there was a drum roll
0.004764912556%
Difference between the two, with the IotaWatt actually reading just a hair low on most days.
In that data I did find that the PoCo fubared one day of data collection which likely explains the difference:
Data for period starting: 2020-03-10 00:00:00 for 24 hours |
|
|
|
Energy consumption time period |
Usage(Real energy in kilowatt-hours) |
Reading quality |
|
2020-03-10 00:00:00 to 2020-03-10 00:15:00 |
0.33 |
|
|
2020-03-10 00:15:00 to 2020-03-10 00:30:00 |
0.3 |
|
|
2020-03-10 00:30:00 to 2020-03-10 00:45:00 |
0.26 |
|
|
2020-03-10 00:45:00 to 2020-03-10 01:00:00 |
0.29 |
|
|
|
1.18 |
|
|
They only captured 1.18 kWh on 3/10/20 and likely “guessed” at the rest of the data.
IotaWatt measured 12802.95 Wh (12.80295 kWh) on that day
Glad I checked the numbers on a per day basis, it’s waaaay closer than I expected.
Now, my current calibration of 10.75 * 0.004764912556 = 0.05214450305
10.75 + 0.05214450305 = 10.8021445
Which is basically the original 10.79 calibration.
I’m going to move back to the original 10.79 and see where that gets me.
A further testament to your great work @overeasy