97-0020-01-01
45
Stacking Features
This
g
u
id
e for
u
se by qu
alifi
ed installers only.
Series Stacking
Allows two inverters to be configured to produce 120 and 240 volts AC,
also known as, a single-phase three-wire configuration. Freedom SW
models with the same DC voltage rating can also be assembled in a system.
For example, a Freedom SW 3012 can be installed on
L1
while a Freedom
SW 2012 operates on
L2
. However, it is important to remember that for
Freedom SW inverter/chargers that support dual line AC configuration (DI-
DO), only
AC INPUT L1
terminal should be used and that the
AC INPUT L2
terminal must have no connections at all. If
L2
is connected to any incoming
or outgoing AC line, the inverter/charger may suffer internal damage not
covered by warranty.
GENERAL PRECAUTIONS
•
Always install stacked inverter/chargers in close proximity to each other.
•
Connect AC neutrals together close to the inverters. Keep input and output
neutrals isolated.
•
Connect the inverter’s battery negative terminals together according to
instructions found in “Step 4: Connecting the DC Cables” on page 30.
•
Make all AC and DC connections and verify that they are made in accordance
with this manual. Make sure that all connections are tight (especially the DC
side). Connect the stacker cable to each inverter’s stacking port.
•
Each inverter must be enabled and turned on individually before AC power
becomes available.
Failure to follow these instructions can damage the unit and/or
damage other equipment.
Figure 18
Series Stacking Using Two Freedom SW 3012s
NEUTRAL
GROUND
Main
Distribution Panel
30A
L1
L2
NEUTRAL
GROUND
120 VAC
Loads
240 Vac
Loads
Inverter AC
Distribution Panel
AC IN
WARNING:
INCORRECT BATTERY
P
O
L
A
RI
T
Y
W
IL
L
C
A
US
E
DA
M
A
G
E
T
O
UN
IT
.
BATTERY
NEGATIVE
BAT
TERY
POS
ITI
VE
AC GROUNDS
(BEHIND COVER)
AC
OUT
30A
AC
IN
PU
T
LI
N
E
1
30A
AC
IN
PU
T
LI
N
E
2
30A
IN
V
E
R
T
E
R
AC
O
U
T
P
U
T
Wiring box cover must be in place during
use to reduce risk of injury to persons
REM
BTS
DC Ground or
Grounding Electrode
Terminal. See
manual for more
information.
WARNING:
INCORRECT BATTERY
P
O
L
A
R
ITY
W
IL
L
C
A
U
S
E
D
A
M
A
GE
TO U
N
IT
.
BATTERY
NEGATIVE
BAT
TERY
POSI
TI
VE
AC GROUNDS
(BEHIND COVER)
AC
OUT
30A
AC
IN
PU
T
LI
N
E
1
30A
AC
I
N
PU
T
LI
N
E
2
30A
IN
V
E
R
T
ER
AC
O
U
T
PU
T
Wiring box cover must be in place during
use to reduce risk of injury to persons
REM
BTS
DC Ground or
Grounding Electrode
Terminal. See
manual for more
information.
AC
IN
N
L1
L2
N1
L1
L2
N2
I
N
P
U
T
O
U
T
P
U
T
AC
IN
N
L1
L2
N1
L1
L2
N2
I
N
P
U
T
O
U
T
P
U
T
30A
Two Freedom SW 3012 units shown.
Freedom SW 3K2K InvChg Install Guide.book Page 45 Wednesday, October 12, 2011 4:40 PM