4
Installing Cables Between Battery Packs and a 15 kVA/20 kVA UPS
4.3
The positive and negative battery strings of each 15 kVA/20 kVA UPS with long backup time require
respectively one battery pack at least and 13 battery packs at most.
The following figure shows cable connections when the positive and negative battery strings consist
of 13 battery packs respectively.
Installing Cables Between Battery Packs and a Single 15 kVA/20 kVA UPS
1. When each of the positive and negative battery strings of a 15 kVA/20 kVA UPS with long
backup time consists of one battery pack, the charge current needs to be set to 2 A or less.
2. The number of batteries in the positive battery string and that in the negative battery string
connected to a UPS should be the same.
NOTE
1. When connecting the battery packs and the UPS, connect cables in the following sequence,
as shown in the following figure.
a) Connect the parallel cables between the positive battery packs and between the
negative battery packs first.
b) connect the cables between the UPS and the battery packs: Connect the OT terminals to
the UPS battery ports and then connect the PP45 terminals to the positive and negative
battery packs.
2. The battery packs can be connected in parallel only if they are fully charged.
UPS 1 battery port
UPS
n
(2 ≤
n
≤ 4) battery port
Battery pack
1 ports
Battery pack
2 ports
Battery pack
13 ports
Battery pack 1
ports
Battery pack
2 ports
Battery pack
13 ports
…
UPS 1 battery string
UPS
n
battery string
…
