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You may search for "e ink paper" and here is one result:
http://www.good-display.com/products_list/pmcId=29.html
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.

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.

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