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   On 14/03/2024 18:11, bp@www.zefox.net wrote:   
   > Mike Scott  wrote:   
   >> On 14/03/2024 15:51, Joe wrote:   
   >>> I'm using a cheap APC, I believe 650 or 750, with USB monitoring hookup.    
   Also have my router connected (with VOIP) to keep   
   >>> communication possible for a little while (runtime abt 30 minutes).    
   Battery replaced once, I believe it was some 7 years old.   
   >>   
   >> Somehow that makes no sense to me..... current 650 is 227 pounds (maybe plus   
   >> VAT) on the APC website. 5 times the cost of the Pi. I'm sure it's a   
   >> very nice UPS, but.... ???   
   >>   
   >   
   > Sense or not, it seems to be a fact of life. The inverter/charger/transfer   
   units   
   > I used have vanished from Amazon, replace by units with four times the power   
   and   
   > double the price. Battery prices seem to have dropped very slightly, but are   
   > still a whisker over $200/kWH.   
   >   
   > A 12 volt to 5 volt stepdown converter appears to be less than $10, small 12   
   volt   
   > batteries range from $20-100 in the few AH range, a 12 volt 5 amp charger   
   ranges   
   > from $11 to $50. The charger would be the iffy part, since a smart charger   
   on a   
   > loaded battery is apt to get confused by what looks like high    
   elf-discharge..   
   >   
   > Something reliable for less than $100 will take both luck and ingenuity. One   
   > possibility is finding a used UPS unit in e-waste and replacing the battery.   
   >   
   > bob prohaska   
      
   Seems the rechargeable bit is the issue. For my part, and purely to use   
   as a short-term standby for the Pi until mains resumes or the system can   
   shut down cleanly - I'd be happy with something with a bundle of AA   
   cells or similar. I doubt a clean switchover circuit would be difficult   
   to design, but my electronics knowledge is decades out of date :-{   
      
      
   --   
   Mike Scott   
   Harlow, England   
      
   --- SoupGate-Win32 v1.05   
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