AEC IST5 Series, Service Manual

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3.1.3.3 Internal Battery Configuration
The internal battery configuration is valid for the 10-15-20-30-40 kVA UPS only, it can be
configured by 62 paces 4,5 Ah, 7 Ah or 9Ah standard as following.
IST5 SERIS INTERNAL BATTERY USAGE TABLE
UPS POWER (KVA) 10KVA 15KVA 20KVA 30KVA 40KVA
BATTERIES IN SERIES 31 31 31 31 31
NUMBER OF PARALLEL ARMS 2 2 2 2 2
TOTAL NUMBER OF BATTERIES 62 62 62 62 62
I_bat_max @ V_bat_cut off. (A)
16,3 24,6 32,7 49,1 49,1
RECOMMENDED INTERNAL FUSE (A) 20 32 40 80 80
RECOMMENDED REAR PANEL FUSE (A) 20 32 40 80 80
* Table shows recommended battery configurations.
* Fast and semi-conductor protection type fuses are used for batteries.
The 7/9 Ah and 4.5 Ah batteries positioning can be seen at the following table;