mirrors
/
Tasmota
mirror of https://github.com/arendst/Tasmota.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Updated Energy Saving (markdown)

Norbert Richter 2018-03-02 16:21:59 +01:00
parent c8bf020eb1
commit 8e69937986
1 changed files with 12 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
Energy-Saving.md

@ -1,37 +1,33 @@
Using the [Sleep command](https://github.com/arendst/Sonoff-Tasmota/wiki/Commands#management) you can instruct Tasmota to sleep for the set milliseconds in its main cycle. While sleeping your device will consume less power.
Setting this around 50 ms reduces power consumption from ~1.1 W to ~0.7 W on an idling (relay off) sonoff and button presses are still noticed correctly. With this setting you have to concentrate very hard to click the button so fast that it is not recognized by the device.
Setting this around 50 ms reduces power consumption from ~1.1 W to ~0.6 W on an idling (relay off) sonoff and button presses are still noticed correctly. With this setting you have to concentrate very hard to click the button so fast that it is not recognized by the device.
If your Sonoff needs to do something continuously, this will be affected. E.g. Sonoff LED will flicker and Sonoff POW will not be able to correctly total the energy consumption. Spot readings of power, voltage, etc. will however remain correct.
> From the release notes:
>
> Expect overall button/key/switch misses and wrong values on Sonoff Pow
The TelePeriod is also affected by the Sleep command. You may need to set TelePeriod significantly lower to get telemetry data as often as expected, especially for Sleep values greater than 50ms.
**Note:**
As the WiFi Modem on an ESP8266 is the major consumer - using Sleep with WiFi AP mode enabled is more or less without effect.
**Notes:**
- In general: All realtime related commands (like `TelePeriod`, `BlinkTime`, `PulseTime<x>` and so on) and all realtime related results (uptime, Sonoff Pow power calculation etcetera) are also affected by the `Sleep` command. You may need to adapt the time values for those command to get capable results.
- as the WiFi Modem on an ESP8266 is the major consumer - using Sleep with WiFi AP mode enabled is more or less without effect.
## Sonoff power consumtion and measurement
The result of the most home used energy meters are very imprecise for power consumtion &lt; 10 W and become more and more imprecise for lower values; furthermore the results of such meters are depending very strong of the load type (capacitive/inductive) and is very imprecise for non-ohmic load types as the Sonoff is.
The result of the most low price plug-in home energy meters are very imprecise for power consumtion &lt; 10 W and become more and more imprecise for power consumtion like Sonoff devices have (&lt; 1.5 W); furthermore the results of such meters are depending very strong of the load type (capacitive/inductive) and is absolutly imprecise for non-ohmic load types having switch-mode power supply like Sonoff devices.
Additonal to that using Sleep - which also periodicaly cycles the power of the WiFi modem of the Sonoff - the result of such meters are more or less useless.
Additonal to that, using Sleep - which periodicaly cycles the power of the Sonoff between 20% and 100% - the result of such meters are more or less useless.
## Example of power consumtion
### Absolute AC line measurement using calibrated meter
The following measurement was done directly on 230 V/AC line using a _Sonoff Dual R2_ connected on two different MID calibrated meter (Eastron SMD630 MID/saia-burgess ALE3).
The following measurement was done directly on 230 V/AC line using a [Sonoff Dual R2](http://sonoff.itead.cc/en/products/sonoff/sonoff-dual) and two different [Sonoff S20](http://sonoff.itead.cc/en/products/residential/s20-socket) connected on different MID calibrated meter (Eastron SMD630 MID/saia-burgess ALE3).
#### _Sonoff Dual R2_ power consumtion using Sleep
Sleep: | 0 | 1 | 50 | 200
#### Sonoff power consumtion using Sleep
Device | Sleep 0 | Sleep 1 | Sleep 50 | Sleep 200
------------ | ------------ | ------------ | ------------- | ------------
Energy | 29.0 Wh | 39.1 Wh | 18.9 Wh | 26.0 Wh
Runtime | 23.4661 h | 46.7219 h | 25,0258 h | 38.2058 h
Power | 1.24 W | 0.84 W | 0.76 W | 0.68 W
Sonoff Dual R2 | 1.24 W | 0.84 W | 0.76 W | 0.68 W
Sonoff S20 | 1.11 W | 0.77 W | 0.59 W | 0.51 W
All measurements were done with
- WiFi STA mode, enabled and connected (70%)
@ -39,7 +35,7 @@ All measurements were done with
- Syslog enabled and connected
- `Teleperiod 60` for debuging
- relays off
- measure period of 24-46 h to reduce measuring fault
- measure period of 24-56 h to reduce measuring fault
The first impression is that a higher sleep value reduce the consumtion, but slightly. The second result is that using `Sleep <value>` (`value` &ne; 0, e. g. 1) is enough reducing the power consumtion at minimum 1/3 up to 45 % (value=200).