Use available energy based on fronius smart meter

Hi there,

I installed 2 months ago 10kWp 3 phase solar system using fronius symo and a smart meter.

Since the feed-in rates are quite low in my country, i would like to use all the available energy to preheat water (in two 500l tanks) by modulating 3 electrical heaters (1 for each phase).

Apart from fronius api/modbus tcp, there is no way for me to read data coming in/to the grid.

Any recommendations to modulate this 3x3kW heaters through nodered ? What hardware would you use ?



fronius ohmpilot doesnt really need any additional clamps to measure anything
i would like to have a similar lan controlled output based on each phase

also, anyone using this metod successfully on AEM CST 0410 meter ?