APC MX3000, Can it be converted to use Lifepo4 batteries?

[larfme]

I picked up a free and working APC MX3000 a few years back. It is in working condition and configured for 208v.
Would I be able to plug in 8 Lishen 272ah lifepo4 batteries in place of the lead acid batteries? Would I need any additional equipment?
The battery input for the APC is 48v
I have attached the user manual.
Any help would be appreciated.

 

[snoobler]

Welcome to the forum.

To attain 48V, you need 16 LFP cells. 8 will only get you 24V.

UPS tend to charge the batteries VERY slowly. This is not a big deal, but you need to be aware of it, and you should know exactly how the UPS charges the batteries, current and peak/float voltage.

Often, they simply charge to a peak voltage of 13.6V/12V battery and hold it there indefinitely. That's 54.4V. That's perfectly acceptable for LFP.

Important the UPS NEVER charges above 58.4V and does not float above 54.4V.

You would need a BMS for the battery.

 

[larfme]

Thank you for the reply. Would it be posable to use a 24vdc to 48vdc converter?

 

[snoobler]

No. The UPS needs to charge a 48V battery. A DC-DC would only supply 48V from the 24V - not charge the 24V from the 48V charger.