Shelly Plug S died suddenly the same time the power went out during a storm.

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I have a smart home with Shelly Plug S in front of all the heaters, but my 2 Shelly Plug S died at the same time at 00:15 26.1.24 at the same time as the power went out according to notification from my alarm company Verisure (which gives immediate notification).

I have lost several other Shelly Plug S in recent years without finding a cause, but now I am 100% sure that the power outage has something to do with it. The power came back 5 hours later and everything else works - also some other Shelly Plug S. All my Shelly Plug S are used in front of ovens with 1000-2000w on 230w. Another unit, Shelly Pro 1 PM tells me that voltage is 238,9v.

I have been in contact with an electrician who is wondering if the power plant has had a phase failure (I have 3-phase with 230v), but I find it strange that it can kill the plugs. They recommend installing a relay and contactor. The fuse box and fuses are brand new.

There has been no thunderstorm, but a lot of wind and the power outage probably has something to do with it.

Can't Shelly Plug S handle lower voltage than 230v +/- 10%? Are they dead then, or can they be restarted? Can I restart them via OpenVPN-connection (as I am situated 300 km away)?

thgoebel

Due to the fact you‘re not in physical contact with the faulty devices you will be not able to execute a reset (by pushing the button at the side of the device). Hence, it is difficult to determine whether a hardware issue exists or if the device has simply lost its WiFi connection and is not able to regain this connection.

If you’re present at the location I would recommend to press the button for more than 10 seconds and watch the WiFi for the AP of the device (192.168.33.1). After a reconnection to the WiFi further investigation should follow to determine if the connection is stable.

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Thanks for answer.

I have of course tried to reach the Plug S through my online connection. And the mentioned ealier failure killed the Shelly Plug S totally. There was no way to get them alive again, even I tried everything onplace. I think it is the same now, but can't check it out now.

I hope it is possible to trust Shelly units, but if I need to fix things on place I must search for alternatives. Sorry to say, I have 20-30 Shelly units.

1. I need to hear from Shelly (or forum) if my problem is a common one.

2. Has Shelly Plug S been tested when one phase on 3 phase power 230v drops out, meaning should the plug tolerate 2/3 of 230v?

3. Further on pkt. 2, should I install an contactor rele in the fuse-box before everything?

thgoebel

Shelly PlugS should work with voltages from 90 to 250V AC. Do use this range after repair of Shelly devices.

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Danke sehr!

As Shelly Plug S should work even one phase suddenly is down giving about 140v I begin thinking of my setting for max w. I don't remember exactly, but I normally set max power 200w higher than the oven / heaters max consum. This because I years ago discovered that one heater used more than it should. Happily Shelly reported this and saved me for possible overload and fire.

If the case is that the Shelly Plug S har cut off because the power max load has been set to low (when suddenly power cut off), is it possible to restart them without being on place?

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