INV2500-HS SERIES
MANUAL
13.0 PARALLEL OPERATION
13.1
The INV2500-HS and INV2500H-HS Series inverter modules are designed to operate in
parallel for higher output current. The modules are automatically connected in parallel in
the shelf. Two or more inverter shelves may also be connected in parallel for additional
output power or for N+1 redundant operation. This is done by connecting all inputs in
parallel and all outputs in parallel (line, neutral, line), although the DC inputs could come
from two separate sources. In addition, the sync terminals must be connected together,
+Sync to + Sync and -Sync to -Sync. The Sync terminals are used only for parallel con-
nection of two or more inverters. Current sharing between paralleled inverters is ±10%.
13.2
Alternatively, separate sources may be used for the inputs to these inverters while the
outputs are connected in parallel. In either case, output loads should have individual
distribution circuit breakers. The following table shows output current and total volt-am-
peres for inverter modules connected in parallel.
Table 13-1. Output For Paralleled Inverters
NO. OF INV2500-
HS INVERTERS
KVA
RATING
115VAC
AMPS
230VAC
AMPS
1
2.5
22
11
2
5.0
44
22
3
7.5
66
33
4
10.0
88
44
13.3
Four INV2500-HS inverter modules in two INVR2U-HS shelves connected in parallel
could be used to produce 10 kilovolt-amperes or could also be used as a 3+1 redundant
inverter providing 7.5 kilovolt-amperes to a load.
13.4
Figure 9 shows four INV2500-HS inverter modules in two INVR2U-HS shelves con-
nected in parallel to give 10KVA of AC output at 115VAC. The AC output is distributed
by a DPAC1UT AC Distribution Panel made by UNIPOWER Telecom.
Note that only
115VAC inverter modules can be used with the DPAC1UT distribution panel, and
not the 230VAC.
Note also that only the “T” (Terminal Strip) Option of the DPAC1U can
be used with these inverters and that, as shown in Figure 9, the A side AC input termi-
nals must be strapped in parallel, i.e., A1G to A2G, A1N to A2N and A1L to A2L; in the
same way, the B side AC input terminals must also be strapped in parallel.
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