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Updated Power monitoring calibration (markdown)

blakadder 2019-02-22 22:48:33 +01:00
parent d9b33c5509
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24
Power-monitoring-calibration.md

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You might need to calibrate your power monitoring device as correct measurements are influenced by hardware and timing differences.
For proper calibration you will need:
## What you need
- your power monitoring capable device flashed with Tasmota and configured to a correct module/template that supports power monitoring
- calibrated multimeter (AC capable)
- incandescent light bulb (we use a 60 W one in the example)
- (optional) power meter (aka Kill A Watt)
- *(optional)* calibrated power meter (aka Kill A Watt)
1. Connect the light bulb to your device.
### Step 1
Connect the light bulb to your device.
* *Optional: Plug your device into the power meter*
2. Open the web UI for your device in one window and another window to that same devices Console
3. Turn power on and wait a few seconds for the power metering to settle on a stable power reading
4. Verify the **Power** reading in the web UI (optionally with the power meter as well) for the expected 60 W and if needed change the power offset with command: <BR>&nbsp;&nbsp;&nbsp;&nbsp;`PowerSet 60.0`<BR>&nbsp;&nbsp;&nbsp;&nbsp;*(if you're using something with different power draw enter the appropriate number)*
5. Verify the **Voltage** reading with the multimeter and if needed change the voltage offset in V with command: <BR>&nbsp;&nbsp;&nbsp;&nbsp;`VoltageSet 235.5`<BR>&nbsp;&nbsp;&nbsp;&nbsp;*(235.5 would be replaced with your measurement which varies depending on the electrical standards and your electrical grid)*
6. Verify the **Current** reading by calculating current value (amperage) using formula **P<sub>(W)</sub>/I<sub>(V)</sub>=I<sub>(A)</sub>** and if needed change the current offset in *mA* (mA=A\*1000) with command:<BR>&nbsp;&nbsp;&nbsp;&nbsp;`CurrentSet 254.777`<BR>&nbsp;&nbsp;&nbsp;&nbsp;*(instead of 254.777 enter your calculation value of ***A multiplied by 1000***)*
Turn power on and wait a few seconds for the power metering to settle on a stable power reading
### Step 2
Open the web UI to your device in one window and open another window to that same devices Console
### Step 3
Verify the **Power** reading in the web UI (optionally with the power meter as well) for the expected 60 W and if needed change the power offset with command: <BR>&nbsp;&nbsp;&nbsp;&nbsp;`PowerSet 60.0`<BR>&nbsp;&nbsp;&nbsp;&nbsp;*(if you're using something with different power draw enter the appropriate number)*
### Step 4
Verify the **Voltage** reading with the multimeter and if needed change the voltage offset in V with command: <BR>&nbsp;&nbsp;&nbsp;&nbsp;`VoltageSet 235.5`<BR>&nbsp;&nbsp;&nbsp;&nbsp;*(235.5 would be replaced with your measurement which varies depending on the electrical standards and your electrical grid)*
### Step 5
Verify the **Current** reading by calculating current value (amperage) using formula **P<sub>(W)</sub>/I<sub>(V)</sub>=I<sub>(A)</sub>** and if needed change the current offset in *mA* (mA=A\*1000) with command:<BR>&nbsp;&nbsp;&nbsp;&nbsp;`CurrentSet 254.777`<BR>&nbsp;&nbsp;&nbsp;&nbsp;*(instead of 254.777 enter your calculation value of ***A multiplied by 1000***)*
Current calculation:
```
@ -22,3 +28,5 @@ W(atts)/(V)oltage=(A)mperes
watts/volts *1000=CurrentSet value
(60.0/235.5)*1000=254.777
```
### End
Congratulations!!! Your device can now reliably monitor power consumption!