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From: <bp@www.zefox.net>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Backup power supply
Date: Wed, 13 Mar 2024 23:14:56 -0000 (UTC)
Organization: A noiseless patient Spider
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Mike Scott <usenet.16@scottsonline.org.uk.invalid> wrote:
> On 13/03/2024 13:18, Andriy D wrote:
>> Hi,
>> 
>> I'm considering adding some backup power supply for my RPi2 mainly
> 
> No answers - but it's something I've been wondering about off and on 
> (albeit for a Pi4). All the commercial stuff I've seen much exceeds the 
> base Pi in either pounds [Sterling] or W (or both).
> 
> Any offers out there? Even something with a stack of AA 
> non-rechargeables would be fine.

For one Pi a 5 volt regulator connected to a battery
that's held on a float charger is probably the cheapest,
though I think the combo will cost more than any Pi. The
efficiency of such a setup is poor, but for one Pi it's
probably better than a more elaborate scheme. Also, there
is no need for line detection logic, which can be tricky.

For my part I settled on a small inverter/charger connected 
to a 12 volt battery. It's even more expensive, but has extra
capacity to run all of my computer and network equipment.
Cost at the time was about $600, more than half of it the 
lithium iron phosphate battery. A bit cheaper now. 

Rated output is 800 W 120 VAC 60 Hz. The battery can deliver
about half that power for about an hour, or run my equipment
overnight. Standby loss is about 10 watts.   

HTH,

bob prohaska