I am working on a device to be powered at a remote village in Africa where power is scarce and the power grid shuts on and off all the time everyday. The device works fine but now I need to consider how to power it. My device doesn't consume a lot of power. It is a microcontroller that operates at 5V and maybe draw around 1A of current. We are going to install a solar array with a battery bank for backup power for the village. If I want to go simple, I can just plug in an ac adapter to the wall, but I don't want to consume any of the precious solar power if a 220V-5V ac/dc power adapter is not efficient. The adapter gets very hot and I believe it is consuming a lot of unnecessary power. Or I can use my 20W/16.5V/1.2A penal with a battery, which should be more than enough to power my device day and night. I have done a lot of googling but I still can't find a proper way to charge a battery with a 20W panel.Any input regarding the best way to supply power to the device will be greatly appreciated!
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I suggest you contact manufacturers of these products, explaining your problem. Many of them have postings at the link.
