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Great idea, do you know any good products that do that?

You may search for "e ink paper" and here is one result:

For experimental purposes you will no doubt pay a premium and costs are expected to go down substantially over time. Additionally, the e-ink display added to a battery case with associated QR code may be a new idea which may lend itself to some sort of patent rights. http://www.good-display.com/products_list/pmcId=29.html

Yes and of course the Datalogger is needed to lock down production amounts for solar produced. Something CoT is actively working on.

Thanks very much I will check that out.