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Shelly schedules firing at the wrong time: time zone, SNTP and the clock change
A Shelly has no time until it asks for it over SNTP, and converts it with its time zone. A fixed offset instead of Europe/Madrid is what knocks everything out on 25 October.
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My Shelly is discontinued: what replaces it, and the four things to check
Nearly all of them have a direct Gen3 or Gen4 replacement that fits the same box. The swap is straightforward except in four cases: neutral, voltage, the V2C and the bypass.
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Shelly Wall Display: four sizes, and not all of them measure temperature
The 4″, the X2, the X2i and the XL replace a switch and fit the same box. But only one measures the room’s temperature and humidity by itself.
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An awning that retracts itself in the wind: Ecowitt WS90 and Shelly 2PM
The station measures the gust on your terrace and the 2PM retracts the awning. The threshold is not guessed: your awning’s wind class gives it. And what can fail, before you buy.
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Tank empty or full, alert on your phone: a float switch and a Shelly Plus Uni
The float goes straight to one of the Plus Uni’s inputs, at low voltage. One float gives one alert; empty and full need two, and the Plus Uni has an input for each.
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The three Shelly Gen3 dimmers do not compete: which one is yours
Each speaks a different language to the light fitting, so the choice is almost never about budget: it is about what your installation accepts.
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How a light is dimmed: phase cut, 0-10 V, DALI and PWM
You do not choose the dimming technology: the light fitting imposes it. Four ways to dim a light, what each one manipulates, and how to tell which is yours.
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Bypass or RC snubber: wired the same way, fixing opposite problems
The bypass is for a load that is too small; the snubber, for one that is inductive. Fitting the wrong one fixes nothing.
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I added batteries and the car will not charge from them: it is not the Shelly clamp
The clamp measures current in a cable; it neither sees the battery nor controls it. The inverter decides whether the battery feeds the car, and by default the charger protects it.
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Three-phase metering when the clamps will not fit: the Shelly Pro 3EM-3CT63
One piece on the breaker instead of three clamps, and Modbus TCP for the BMS. The price is 63 A and a 9 mm cable opening worth measuring first.