Die Verwendung von Skripten erfolgt ausdrücklich auf eigene Gefahr. Weder Shelly noch die jeweiligen Autoren oder Entwickler der Skripte übernehmen irgendeine Form der Haftung für mögliche Schäden, Fehlfunktionen, Datenverluste oder anderweitige Beeinträchtigungen, die durch die Nutzung dieser Skripte entstehen könnten. Bitte stellen Sie vor dem Einsatz sicher, dass Sie den Quellcode verstehen und sich der möglichen Auswirkungen bewusst sind. Die Skripte werden ohne Gewähr bereitgestellt und unterliegen keiner regelmäßigen Wartung oder offiziellen Unterstützung.
Wenn Sie eigene Skripte bereitstellen, achten Sie bitte darauf, eine klare Beschreibung, eventuelle Einschränkungen und Sicherheitsaspekte zu dokumentieren. Beachten Sie zudem, dass Nutzer Ihre Skripte grundsätzlich auf eigenes Risiko verwenden. Eine Haftung für Schäden ist ausgeschlossen, sofern diese nicht vorsätzlich oder grob fahrlässig verursacht wurden oder gesetzlich anderweitig geregelt ist.
Is there a way to limit the A that go through the shelly?
Hello,
this is not possible.
Is there a way to limit the A that go through the shelly?
While it's not possible to regulate the current to a specific value through a Shelly relay, a maximum current can be set or measuerd. If the set maximum current is exceeded, the Shelly will shut off and generate an overcurrent alert.
However, repeatedly turning the heater on and off at a certain current via a skript is not recommended because the water heater is an inductive load. This can cause voltage spikes and potentially damage both the Shelly and the heater or even more. Therefore, using a two-point controller method with Shellys for a water heater is not recommended. Additionally, it's worth noting that Shelly smart relays are primarily designed for controlling resistive loads and may not be suitable for inductive loads like water heaters at all.
In theory you could write a script to turn a Shelly into a two-point controller / on-off controller for a water boiler, if its a Shelly thats able to measure A. Or you could just turn the realy of if the power you are getting from your solar array is less than 3kwh.
In practice, however, it would be a bad solution, one that would quickly lead to a destroyed Shelly or even more damage.
because the water heater is an inductive load.
Could you explain that in detail? During my academic studies I was told heating of liquids is done generally by resistive elements…
"Oh, my bad, you're right. There are no coils in a boiler.
(I somehow had to think of coils, of course a water boiler does not need coils.... 
)
I also realized that a two-point controller wouldn't be a solution for his problem.
It's I was thinking of a boiler when I mentioned the two-point controller, and how to keep its water at the right temperature, which led to my confused answer. 
Dont ask me why.
In any case, regulating the current to a specific value through the Shelly relay is not possible. However, you could simply turn off the relay if the power being generated by your solar array is less than 3.1 kWh,
If your solar array isn't generating more than 3.1 kWh, then it won't be possible to make this work at all. So yah a shelly is not the right solution for this and even if you are producing more than 3.1 kwh its still not a good solution.
