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From: Lars Poulsen <lars@beagle-ears.com>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Backup power supply
Date: Fri, 5 Apr 2024 14:13:35 -0700
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On 3/13/2024 4:14 PM, bp@www.zefox.net wrote:
> For one Pi a 5 volt regulator connected to a battery
> that's held on a float charger is probably the cheapest,

That is what I used for my CPAP which has a 12V input for use when 
camping. A motorcycle battery and a trickle charger.

But since then, I installed a backup generator for the whole house, so 
the wife wanted the jerry-rigged UPS out of the house.

-- Lars