MGE UPS Systems 3.5 to 21 kVA N+1 - Manual (Page 30)

2.8.3 DC Input Circuit Breaker
Due to tremendous amounts of short circuit current available (in excess of 1000A for as long as several minutes!)
from bank(s) of batteries, that supply electrical power to inverter systems, it is extremely important to connect a
properly sized DC circuit breaker at the DC input cable that feeds the inverter system. The following table is pro-
vided as a guide for selecting the proper circuit breaker.
Table 2-4: Line To Line Units Suggested DC Circuit Breaker Ratings.
Inverter rating 7 kVA 14 kVA 21 kVA
CB rating 200A 400A 600A
Figure 2-6: Inverter Receiver Junction Box, Input and Output Wiring.
Installation & Operation - Line To Line
3.5 to 21 kVA N+1 Inverter
page 2 — 12
BATTERY
(-)
BATTERY
(+)
JUNCTION
BOX
INVERTER RECEIVER
WITH JUNCTION BOX
BACK VIEW
INVERTER RECEIVER
WITH JUNCTION BOX
SIDE VIEW
GND
L1-IN
L1-OUT
TB1
L2-OUT
L2-IN