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

[Brooke Clarke]

Hi John:

The company no.co makes a family of Li batteries that's a form, fit and functional replacement for a classical flooded 
lead acid battery for small gas engines, like a motorcycle or generator (4AH).
https://prc68.com/I/Gen.shtml#Replacement_Battery
The idea is that you do not need to use a Li specific charger.  They say there's a small capacity loss when using a 
flooded lead acid charger compared to a Li specific charger.

There's a problem with Li batteries that I'm starting give a lot more weight and that's what happens when they catch 
fire or vent. This is something that has a very low probability of happening but when it does the result is very very 
very bad.  Fundamentally you can not put out a Li battery based fire and it vents toxic explosive gases.

The same company (no.co) has a family of smart chargers and I've been playing with on on a car battery that turns out to 
be an AGM (I didn't know that when I started).
https://prc68.com/I/Cars.shtml#Noco_Genius_10

Today I'd recommend replacing the existing AGM batteries.

-- 
Have Fun,

Brooke Clarke
https://www.PRC68.com
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

-------- Original Message --------
> 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
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe send an email to time-nuts-leave at lists.febo.com
>