as mentioned above, and previously stated in so many threads. the gel or agm batteries are not meant for our ups use or with solar, the gel are meant for telecom use and AGM are to be used in RVs and other small scale projects where load doesnot exceed c/20 of the battery and not for periods longer than 2hours a day.
for heavy backup like a 10KW system, the only recommended options are using 2V cells, of 500AH or higher capacity… again they are very very very expensive when bought brand new, but they usually last a lot of years and mostly trouble free. and also they have an excellent replacement setup, where if one cell fails, you can simply remove that cell and replace it with new one, without breaking the bank over all the batteries. they will take very high solar power in to charge and are very deep cycle, very reliable. Properly importing brand new cells is not a task for any shop in market, only authorized resellers and importers like cosmiq internationals(the one i know of) . you may also buy used cells at a much lower price, and again, if cell fails just replace that one. luck of the draw though. available in lahore/ faisalbabd / gujranwala.
the 2nd feasable option is to buy 4x strings of AGS 220AH Giant sized batteries,… they last very well, atleast 2 years each… cost brand new at 1/3 price of gel batteries, have 6 month warranty, cells can be repaired easily too. they are affordable and very good, but cycle is around 2-2.5 years max. still at half the cost , the 2 time replacement would still be as good and cost effective as a new gel battery.