[time-nuts] Re: Backup DC power with current battery technology?

[Germán Herrera]

Hi John

Probably a little overkill, but I have good experience with the Mini-Box 
OpenUPS boards (the original, one not the OpenUPS2). It can be setup 
with multiple cell chemistries, does balancing, has wide input/output 
voltage, 6A (10A peak) output current, etc.. Only issue (beside cost) is 
that it's switching, so maybe the added noise makes this a no-go.

BR, German

On 2024-05-26 11:39, John Ackermann N8UR via time-nuts wrote:
> I need to replace the batteries in my 28 VDC power distribution system 
> in the clock room.  It's currently two series 12V AGM batteries with an 
> IOTA Engineering float charger.
> 
> This system has two purposes: (a) primary power for some OCXOs and 
> other gear; and (b) failover power for some AC/DC gear like HP 
> standards. Under normal conditions, power draw is 2 or 3 amps.  During 
> mains outage, it could reach 10 amps.  Now that I have a house 
> generator, long run-time isn't a big issue so 25 Ah or so of capacity 
> is plenty.
> 
> I haven't explored LiFePo4 batteries until now, and I'm having trouble 
> finding a charger that can provide significant continuous load current 
> while maintaining a battery floated across the line.  Does anyone have 
> recommendations for something like this?
> 
> Thanks,
> John
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