Hello,
I am looking for industrial battery capacity tester. The total voltage of 120 cells around 135V. Max discharge current will be 1300ADC. Is there any brand of tester might solve my problem? Thank you.
If it is battery capacity and not capacitance (a load test), Programma / Megger make a unit called the TORKEL 840/860. It is a modular system, so extra load boxes can be added based on how much discharge current.
I've used it many times and it does what it is supposed to do with little fuss.
At that voltage and current level you might want to look at generator maintenance contractors. Most have a big resistive loadbank with AC-powered cooling fans available for hire. You'll need a lot of Torkels banked up to handle 1300A. ;-)