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Solar Powered Low Power Embedded Device

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bin_liu:

--- Quote from: Kalcifer on July 02, 2020, 01:29:01 am ---
--- Quote from: bin_liu on July 01, 2020, 08:19:20 am ---However, these two points will not be obvious if the current is too small. SO, the electric razor we use supports long-term charging.

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electric razor?

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with charging function shaver ;D

Kalcifer:

--- Quote from: bdunham7 on July 03, 2020, 03:55:31 am ---An experiment is certainly in order, as we're all guessing, but my guess is you will have a lot more current than you think with that panell.  Are you using more than one cell in series?  How many?  I suspect that the simplest solution is also going to be the best, and that is just your panel, up to 3 cells of at least 600mAh and a 1N4148 blocking diode.  If you don't have parts yet, a cheap experiment could be done with parts from those solar pathway lights the sell at the dollar store.

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I've conducted a number of experiments with the panel already in low light conditions (a 29W halogen bulb from approximately 1m distance) and produced ~30uA of current. In full sunlight outside, however, I've gotten it to produce maybe a couple of miliamps, but I haven't had any sunshine intense enough where I live to get the full power that this panel is rated for. With indirect light in the shade on the north facing side of the house, I produced anywhere from 10uA to a couple hundred microamps depending on how I orient it. In the final product I will most likely have the solar panel optimally oriented in the direction that gets the highest average outdoor light.

I am using this single cell that I linked above. As for the blocking diode I am using a BAT41 Schottky Diode. I slowly have been gathering parts from Digikey and experimenting as I go.

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