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echo: rberrypi
to: RICKMAN
from: DAVID TAYLOR
date: 2017-07-01 10:28:00
subject: Re: Pi USB Batter UPS Set

On 30/06/2017 20:20, rickman wrote:
> David Taylor wrote on 6/30/2017 4:19 AM:
>> On 29/06/2017 15:30, rickman wrote:
>>> David Taylor wrote on 6/29/2017 3:33 AM:
>> []>> Rick,
>>>>
>>>> This one (or similar) on Amazon US claims to be a UPS, and just needs 6
>>>> 18650 batteries.
>>>>
>>>>
>>>>
https://www.amazon.com/Feamos-Mobile-Battery-Charger-Universal/dp/B01H52KI70/re
f=sr_1_2?ie=UTF8&qid=1498721130&sr=8-2&keywords=power+bank+ups#Ask
>>>>
>>>>
>>>>
>>>>
>>>> but also mentions a 1-second gap.  Sigh!
>>>
>>> I assume you mean when disconnecting the input power it takes 1
>>> second to
>>> restore power to the output?  I didn't see anything that mentions
>>> that.  I
>>> did see one review that said it can't generate output voltages above 12
>>> volts when being charged, but that wouldn't be a problem for the rPi.
>>>
>>> Seems this unit has a buck converter to generate voltages below 12 volts
>>> and a separate boost converter for voltages above 12 volts all
>>> selected by
>>> a pair of slide switches.  I am guessing the boost converter is
>>> reused for
>>> the charging circuit so the higher voltages are not available when
>>> charging.
>>
>> The unit has a 5V/2.1A USB outlet, which I would expect you to use for
>> the RPi.
>
> Not sure what your point is.  What your wrote has nothing to do with
> what I wrote.

I was unsure why you were mentioning the 12V output in connection with
the RPi.

--
Cheers,
David
Web: http://www.satsignal.eu

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