Hello julle, typically thrown away, but would be worth gold to me.
Office type UPS 5 to 10 kW 230VAC but typically 180 V nominal DC which used 16 x 12V LA battery banks.
(Not economical to replace)
I built a solid 200V 10 kWh Lithium battery but my Eaton 9PX 5kW UPS has now retired.
A 10kW UPS was given away on another forum but I was too late to dibs. (wonder if that UPS is even in use now...)
Willing to pay copper value+. Bought an Eaton 15kW UPS but that runs on 400V DC.
Before re-configuring my powerwall, thought of asking around for a direct replacement.
Centurion area, but will collect anywhere in Gauteng.

@Abe53 I see another Ai response to your post regarding ups's. I have dealt in detail with ups's in mission critical setups( medical theatre's and Icu's)

I have use PSS ups's as they are great quality fairly priced and defenitely technical assistance. I have used the EP and EPI series 30kva three phase units in most installations. They have a big range pf ups's and battery technologies. Do yourself a favor and visit their premises at 19 Angus Crescent, Unit 4, Longmeadow Business Estate East
Modderfontein
Gauteng

Ask for Roelof one of the sales guys. Below link to their website.

https://pss.co.za/product-category/ups/?gad_source=1&gclid=Cj0KCQjwna6_BhCbARIsALId2Z3x6B9d1teyH2lofMdtFU1KCT9sa_lHb7LaorILwBzwsjepNMGn0uwaAlK4EALw_wcB

I have a working 10kVA GP810 PSS Transformer based UPS but its in Cape Town.