Power Star IR4000W on lithium

[Chris G]

Good day all

I have a Power Star IR4000W LF inverter currently running on 4  x 12MVR180 in series.  No Solar as I use it as a UPS style inverter for load shedding.  Unfortunately the batteries seem to be coming to the end of their life and I would like to replace them with a Lithium battery. Is this possible and if so what size would be recommended?

Secondly would a battery balancer help to extend the life of the batteries a bit at this stage? I notice that there is one battery that drops to 10.5V quickly ( about 1 to 1.5 Hours) if the inverter gets a 2KW load.  ( I got the batteries second hand and they where previously pulled to 10.5V a good number of times in their  4 year life)

Edited May 18, 2022 by Chris G