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This is a very helpful post. I want to run a rpi off solar in a context where there is no other power source. I have read that the rpi or sd cards might be damaged if it suddenly powers off when the battery runs out. It would be best, therefore to include in the setup something that will initiate a clear shut down when the battery voltage dips below a certain point. I would like to use a cheap 3.3V arduino mini pro to do this job. Are there any instructables around that show how to set something like that up? are there any cheaper solutions that will do the same job?
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