device disconnected very frequently

    • Autor

    in a register box I have two 2.5, two dimmer2 and one plus1pm

    for several years they have worked without problems.

    but since a month or two. a 2.5, always the same, stays offline more and more frequently.

    I have tried turning off power saving.

    also to activate roaming. varying the threshold in various tests. no effect either.

    I have also tried to open the box and reposition the devices.

    neither. the result is always the same.

    After a while the device disconnects and I have to cut power to bring it back to life.

    the signal level is around -45db inside the box.

    the devices communicate by coiot in unicast to ha.

    In the house there are several devices, this being at an intermediate distance from the access point in relation to the others.

    any suggestions?

    At least one electrolytic capacitor in the Shelly 2.5 has probably lost it‘s capacitance, Some facts about this issue are written here (unfortunately in German language):

    Thema

    Defekte Elkos bei Shelly 2.5 (und anderen Shellies…)

    Hatte gestern drei Shelly 2 .5 aus unterschiedlichen Bauserien auf dem Labortisch. Bei allen dreien zeigten sich die Symptome „Rauschen“, „Fiepen“, instabile WLAN -Verbindung bis zum völligen Ausfall. Eine Überprüfung der drei Elkos (2 HV-Elkos 4,7μF/400V, 1 NV-Elko 100μF/16V) ergab, daß in allen drei Fällen die NV-Elkos „taub“ waren: Die Kapazitätswerte reichten von einigen 100nF bis knapp 20μF. Nach dem Austausch der NV-Elkos laufen die Shellies wieder…

    Um einer fehlerhaften Charge von Elkos…
    thgoebel
    15. April 2022 um 10:34

    With some skills in soldering (better more desoldering) it is possible to replace the parts.

    „Habt Geduld. Alle Dinge sind schwierig, bevor sie einfach werden!“ (aus Frankreich)

    „Nothing in life is to be feared, it is only to be understood.“ (Marie Curie, 1867-1934)

    „Comment is free, but facts are sacred“ (C.P. Scott, britischer Verleger)

    • Autor

    Well, I finally broke it.

    indeed the capacitors were dry and gave very little capacity.

    but they are so small! so assuming the two 4.7's were in parallel. I have put one of 10. but no.

    has melted the resistance.

    so I'll take advantage and buy a pair of 2plus