It is intresting to know that Abid's UPS seems to extract more amount of energy than a system already have.
I really appreciate his efforts in making a system which is nearly 100% efficient.
We almost always find UPS with efficiency around 70% and Batteries around 80% + some some other losses,which makes the usable energy out of system nearly 60%
It is simply defying the laws of physics but it could be that he just did something new.
============================================
I can provide you some rough calculation
AGS 200 = 180 Amps
Battery efficiency = 90 %
UPS efficiency = 70 %
Voltage 12
180 x 12 x 0.9 x 0.7 = 1360
so watts available out of this system = 1360
Requirments 3 fans each 80 watts
3 x 80 = 240 Watts
Max Runtime = Available watts / Watts consumed
= 1360 / 240
= 5.6 Hours run time
==================================================
You can see bro i havent even included the line losses yet
=============================================
After Reading other posts : Of course Elxlr, you are saying that Abid's UPS is very efficient and it is providing you long backup times because you have experienced it and thats why I believe on your words.
How Abid's ups is providing more backtime only god knows, it could be that he is draining the battery too much like 10V or something + his ups could be efficient.
At the moment we can only hypothesis.