Help fixing my Expression Tag

I am using an expression tag to self increment. This is to track Kilowatt hours used on a specific machine in a factory. I am using the following expression: {[.]200 Hp kWh}+{[.]200 Hp kWh Net}

This has a had mixed results. I wrote 0 into the tag so it wouldn't be trying to add null. I have some tags that are working and others that even when I set its value to 0 its stays null.

Is there a better way to do this? or a way to fix what I have?

You can't use an expression tag to write to itself (assuming I'm reading your post correctly).

There are various threads on here about totalizers. Perhaps start here:

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