Advice needed: Replacing UPS Batteries with LiFePo4

[FrikkieDieSoldaat]

Good day my fellow Carbies!

As in the tittle, I need some advise on replacing older Lead acid batteries on my super old UPS.

Model: Tescom APEX 1500
Input: 220Vac - 240Vac, 50/60Hz, 9A Max, 1Ø
Output: 220Vac - 240Vac, 50/60Hz, 1Ø
Capacity: 1500VA/900W
I cannot get any info online on this model ups, its still working great, when loadshedding starts, it kicks in with no issues, we are currently running our embroidery machine and server at the workshop on this. It saved many a garment from loadshedding, but the batteries has run its course and now I can't risk a R1500 jacket if loadshedding looms.

The batteries I am currently looking at:

GIZZU 12V 7AH LIFEPO4 REPLACEMENT BATTERY - Syntech

The Gizzu 12V 7Ah Lithium-Iron Phosphate (LiFePO4) Battery is the perfect replacement solution for devices and machines relying on lead batteries, such as gate motors, alarm systems, electric fences & CCTV. With a battery management system and up to 10x more life than lead acid batteries, you...

www.syntech.co.za

• Max Charge Current: 7Ah
• Standard Voltage: 12.8V (89.6Wh)
• Constant Discharge Current: 10A
• Charge Current: Normal Charging Current: 3A, Max Charging Current: 7A

Will these batteries work in my ups or am I too optimistic?

 

[Triggerxi77]

Frikkie based on the spec its a 900W output inverter. You need a battery that can give you that can firstly give you tthat much output and secondly do it for the duration of loadshedding. Even tough the inverter is 900W, your machine may only need 300W for example. A typical goid quality 12v 100ah battery has about 600W of usable power if you discharge it to 50%. If you dishcarge iy more its lifetime will reduce significantly. The battery should be able to discharge aat 20amps. Thats around 250W output only. What is currently in the ups?