Optimal usage of the energy from the solar panels by using a variable load.

Last updated December 28 2025
Status: Tested
The goal is to use the optimal amount of power from the solar panels and store it as warm water. In other words to keep the exchange to the grid at a minimum.
Variant 2
Use the P1 port from the smart meter to read the power delivery in Domoticz and send this data to a controller in Node Red which output is send to a ESP module with a PWM to control a variable load.
Step 1 read P1 values into Domoticz

There are many descriptions about this topic on the web to be found also you can have look at my notes
Under hardware you find the used P1 connection, pay attention to the 2 at the beginning of the line this is the hardware index which is important for the MQTT topic.
Under devices you find the usage of L3 which is to be maniputed with the variable load, pay attention to the 7 at the beginning of the line this is the device index which is important for the MQTT topic.
Step 2 Send values to a MQTT broker

Under hardware create a MQTT Client Gateway with LAN interface
When the values from the P1 are updated the MQTT server will also be updated.
Step 3 Process the delivery value with a calculation in Node Red

I measure the delivered power to the grid and scale the PWM output so that the heating element is going to use the same amount.

The ESP PWM output is controlled by a simple http request.
The advantage of steering the ESP by an URL is that there is no need for configuring the ESP other then flashing it with ESPEASY.
Device to convert PWM(3.3V) to 0-10 volt, needed for my PWM controlled heating element.
Below the result
Node red export

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