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First, I am working on rewriting my code and in C which will drastically reduce the load imposed from the sampling and calculations, allowing the code to run on older hardware.
The recommended amount is between 700mA for a Raspberry Pi Model A, and up to 2.
Now I could put this device on a cord and witness impact I have on contributions to my overall power consumption by monitoring the optional devices around the house.
Anything over 6V is likely to damage the Pi.