Lost serial number for HM800 inverter :/

[sylvain-fano]

Hi there,
i'm dumb and i can't find where i the package with the S/N label printed on it of one of my HM800 is ... I could get it on the inverter itself, but i would need to climb to the roof again and remove the solar panels & everything again ... :/
Is there a way to scan the S/N from opendtu, or from any other way using the esp32 + the rf board after initializing a power off / power up sequence for example to restart the inverter ? (kind of autodiscover mode for stupid person like me ?)

pls help 🙏

[spcqike]

i don't think so as this would be a big security issue. if you could scan all available inverters, you not only could read but also control them, as there is no additional login or safty feature.

i'm not to sure, but i guess the data is somehow encrypted with the serial number itself, so that you can't read and control every device around you.

[sylvain-fano]

Hi @spcqike ,
In the meantime, I bought the Dtu pro device from Hoymiles, because i read in the documentation that there was a "scan" feature .
I tried, and it worked, it was able to scan & find all my inverters nearby, without giving it any specific informations.

So, to answer your question, i guess the traffic is not encrypted. Or if it is, there is a symetric key embedded in all Hoymiles devices so that they can talk to eachother. But i dont think so ...

It would be interesting to know if such scan feature would be possible with OpenDTU, listening on all traffic on the specific band, just like a wifi device switched into promiscuous mode

[spcqike]

thats intresting to know.

so, one could use a DTU pro to annoy your neighbors?

do you also see devices, that are not yours? if so, could you read or even control them with your openDTU?

[huste511]

As far as I know, the serial number of the inverter is transmitted as plain text.

I had read somewhere online that you could scan/intercept serial numbers with OpenDTU hardware and the corresponding software.

I asked myself exactly the same question back then. What prevents strangers from setting the inverter to, for example, 10% power in the neighborhood or on the move from their car?

This is probably also the standard security for branded products from China. ;-(

PS to the initial question: An edoscope camera for 40-50 EUR on a rod might be a solution.