Calculate energy usage

Hi

I have solar panels who generate more power than I use.
I have a node who gives me the value of produced power from solar panels, and a node who gives me the value of exported power to the grid. I want to calculate power usage of the house from these values.

Any ideas?

I have tried to put the values in context variables, but i cant seem to get it to work.

thx

Can you provide the output from both of the nodes, use a debug to capture it.

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