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

[Richard Karst]

The  LiFePo4 batteries are amazing things but for backup purposes there is a catch. They often have a build in BMS (Battery Management System) and under certain conditions  such as for example a small overvoltage the MosFET in the BMS can switch of the power to you equipment without prior notice.

Richard 



Op 26 mei 2024, om 16:39 heeft John Ackermann N8UR via time-nuts <time-nuts at lists.febo.com> het volgende geschreven:

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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Met vriendelijke groet | With kindest regards | Cordialement | Med vennlig hilsen | Mit freundlichen Grüßen,
 
Richard Karst
PA1fYB
 


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