My Shelly H&T e-ink gen3 updates every two hours. Found no way to change this.
It seems impossible to me that Shelly’s newest thermostat has limits imposed even by its user interface alone.
It seems that you cannot control the refresh rate and it stays at two hours, and if you cannot lower the threshold for reporting temperature change, which cannot be adjusted to less than half a degree. With those limits, this item is useless as a thermostat.
Does anyone know how to change the update frequency and/or the update threshold?
The engineering also leaves something to be desired; it lacks a small hole in the casing, and so to put it in ap mode and be able to work with it, you have to open it.
At least it looks that way to me.
Either I am missing something, or this object is a case of bad engineering.
This is very disappointing. I have the old sensors which are also pretty useless. I thought upgrading to the new ones might improve things, but not very much, it seems. I have very old AAA battery devices that update every minute regardless of changes and a set of batteries is cheap and lasts a year or so. The data goes to local storage or the cloud - it’s not as slick as Shelly, but at least it’s up-to-the-minute information.
When running on batteries the Device behaves as follows:
Wakes up every minute to do a measurement. If there is a 0.2 °C temperature or 3% humidity difference the screen updates. The default threshold for reporting is a change of 0.5 °C or 5%. If the change is less there will be no report sent.
If for two hours there is no report based on threshold values, the Device unconditionally (disregarding threshold values) reports its status to Shelly Cloud and other connected channels.
Due to self-heating a cool down period of 5 minutes is imposed. During this period the Device would not wake up at all.
On USB power supply
If powered via its USB port the Device will wake up every 5 minutes, perform a measurement, update its screen, unconditionally report to all connected channels, and sleep for 5 minutes."
So far the Shelly reports that it’s powered via USB. Fortunately it still reports battery percentage to Home Assistant
Let’s see how long the battery will stay alive. I personally don’t care about changing it every two months.
IMPORTANT: Once you soldered this connection you must not connect it to USB power supply as long as batteries are plugged in! So either batteries OR USB.
Happy soldering… and it comes with absolutely no support and no warranty.
I tried the method suggested by chriz239, and before the modification the battery reported by Shelly H&T Gen3 was 70%. After about a week, it now reports 51%. At the moment, the temperature updates approximately every 10 minutes.
I also did the chriz239 mod. Good quality batteries last about a month.
According to the datasheet in USB power mode Shelly H&T G3 should report to every connected channel and then sleep for 5 minutes for cooldown. Which gives a report every 5 minutes. I have mine connected via MQTT and this is how they behave. I don’t know why some people mention 10 minutes between readings, maybe it’s HA integration specific.
Even with good quality batteries, I don’t think it’s worth replacing them every month. If it were every 3–4 months, that would be more acceptable. I know I could use USB power or keep the original battery-powered functionality, but where Shelly H&T G3 is located I don’t have the option to connect USB power. Because of this, I gave up on the Shelly H&T G3 and switched to the Aqara WSDCGQ12LM.
