Alpha Technologies AMP24 HP - Manual (Page 34)

Doc. #: 0260011-J0 Rev B 32
3.9.2 DC Input Groups
DC feed from the batteries to the inverters is protected by input breakers. The numbering of each DC
input breaker corresponds to the shelf it protects: DC3 input breaker, for example, protects shelf 3.
shows a four shelf, split phase system with the breakers and corresponding shelves labeled.
Figure 14 — DC input breakers
DC3 breaker DC2 breaker
DC1 breaker DC4 breaker
DC 1
DC2
DC 3
DC 4
Phase 1
Phase 2
Table H — DC Input Groups
Monitoring DC Source
Bulk Assign all inverters to DC Input Group 1.
Shelf Assign Shelf 1 inverters to DC Input Group 1
Assign Shelf 2 inverters to DC Input Group 2
Assign Shelf 3 inverters to DC Input Group 3
Assign Shelf 4 inverters to DC Input Group 4
Dual Input If the system has two battery strings and makes use of the dual input feature (see 5.3.3):
• Battery 1 string is fed to the inverters through breakers DC1 (shelf 1) & DC3 (shelf 3)
• Battery 2 string is fed to the inverters through breakers DC2 (shelf 2) & DC4. (shelf 4)
To monitor Battery String 1, assign all the inverters in shelves 1 & 3 to DC Input Group 1.
To monitor Battery String 2, assign all the inverters in shelves 2 & 4 to DC Input Group 2.
Configuration of the DC input
The configuration of the DC input to the inverters provides several different ways to monitor DC input
power and input current. Table H provides possible configurations.
The number of DC Input
Groups (maximum eight) is
set in the Inverters > Group
Mapping screen and monitored
as a unit in the View Group
Status screen.