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Pi UPS

That board is an on/off controller, rather than a full UPS interface. It only has two 3-pin SOT23s and one 5-pin SOT23 on it, so don't expect too many smarts.

I only meant it as a source of ideas, not something that you would actually use, particularly at that price. The Python script that makes it work is probably more interesting than the hardware. If you reuse those exact GPIO pins, you could use the script without modification.

Any UPS solution you come up with will need to do something similar.

Allan

Reply to
Allan Herriman
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Yes, I'm just trying to think it through. I think for many 24/7 apps, you would want the rPi to power back up when the mains power returns. I believe that is an option on most PCs. Likewise it should be an option on the UPS.

--

Rick C 

Viewed the eclipse at Wintercrest Farms, 
on the centerline of totality since 1998
Reply to
rickman

There are a LOT of usb power with LiPo or LiIon solutions out there, one of which I saw that was solar powered and capable of driving 2.1A out of the 5V USB power. So yeah, shop around and see what you can get. Many are under $20, and apparently under $10. Some charge from a car OR AC adaptor, some require a USB power adaptor to charge them (and then they'll supply power for other things up to battery capacity). But yeah, off-the-shelf solutions exist.

Check out what's at adafruit.com as one example. [I won't link to specific products there, they just have a lot of RPi stuff and LiPo stuff and solar stuff and good quality DC power supplies for things _LIKE_ the RPi or Arduino, etc. etc. - a candy store]

Reply to
Big Bad Bob

The specific problem people are encountering with most of these, and which isn't often stated in the product description, is the ability to draw power while the device is charging, because that's typically what you want from a simple UPS-like thing. Otherwise you might as well get some lithium cells, an Arduino and a few other bits and pieces, and make a proper one yourself.

Reply to
Rob Morley

Rob Morley wrote on 10/23/2017 7:16 AM:

I have yet to see one I would call "proper". There was one that did everything it was supposed to do, but it was from Europe and was a bit pricey. None of the others would do everything that is really required.

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Rick C 

Viewed the eclipse at Wintercrest Farms, 
on the centerline of totality since 1998
Reply to
rickman

I have recommended the RS brand power banks in the past. They do the power through, but I have had the output switch off on occasion, perhaps through overheating.

10,000 mAh and I have been running one for months as a UPS.
Reply to
Steve Drain

As others have pointed out providing power is only part of the requirements. There need to be signals for indicating the power is running down and the device needs to shut down gracefully. Also there needs to be protection to prevent over-charging the battery or running it too low. Then there needs to be a way to shut off all power to the device being powered and options on how power is restored.

--

Rick C 

Viewed the eclipse at Wintercrest Farms, 
on the centerline of totality since 1998
Reply to
rickman

Which is why I said that if you want a proper one (FSVO "proper") you may want to build it yourself, possibly using something like an Arduino.

Reply to
Rob Morley

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