Direction connection between IR-Power meter and ESP32

[Kukusse]

Hello,

My IR-powermeter (Tasmota - Volkszähler hichi) sends the value per MQTT to a Raspberry Py with Home Assistant. The OpenDTU ask then the data per MQTT. And this is working fine.

But the OpenDTU can adjust my global output power to 0W (Nulleinspeisung) only if my wifi rooter is switched ON. If the rooter is switched off, then the OpenDTU forces the Inverter to send a fixed value, regardless of my global power consumption.

My wifi rooter needs ca. 30W of electrical power to run. If I switch it off, the base consumption of my home at night is 40W or 140W, depending if the compressor of the fridge is running or not.

Is there any possibility to send the data of the IR-Powermeter directly to the OpenDTU, without using an active rooter ? Like a wired connection ? With this, I would be able to get a better usage of my battery power.

Many thanks,

Grüße!

[spcqike]

sure. you can use ESP32 with ethernet on both ends, set static IPs and connect them via a switch. so the opendtu can query the powermeter reading via http(s)+json over ethernet.

while this is some nice project, i wouldnt do it. i would either spend money on a newer / more power efficient router or on a dedicated wifi accesspoint that runs 24/7 or wouldn't turn off the router at all.

[Kukusse]

Thanks for the answer. This is true, there are other ways, I need to summarise the pro / contra of both solutions. Maybe buying some eurocents of electricity or using a couple of % of the battery at night is, in comparison with other solutions with some small investment, an correct solution !

[schlimmchen]

You are looking to attach the "TTL" Version of the Hichi directly to OpenDTU-OnBattery. This is something that I wanted to try for months now. As it seems that nobody is using this feature or it just works, I did not bother. It will only work if your smart meter spits out the expected OBIS values. So... Maybe try?

[Kukusse]

I would be pleased to try this solution, but I think I will reach here my technical limit...