W to kw formel

[P3774n]

Hi

I made a simple math scritp, it worked fine.
But when i have negativ -W = when i produced sunpower the -w turns in to positiv in my kw formel. Why?

So
-30+-30+-30=-90w -90w/1000 should be =-0,090kw but the results is 0,090kw

Thanks

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