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2.0  INSTALLATION

© 2001 Xantrex Technology Inc.  All Rights Reserved.

P/N  975-0013-01-01 Rev B  10/01

9

Series Stacking (continued)

The STACKING port allows two SW or PS Series inverter/chargers to be used in the same system in a “SERIES”

configuration to operate 240 VAC loads. Series stacking can also be used to connect to 240 VAC only power systems
providing both 120 and 240 VAC outputs. A series stacking interface cable (SWI) is required to connect the series
stacking port of the inverters. In this mode the inverters act independently of each other; however their output is
phase locked and synchronized 180 degrees out-of-phase. Both units can independently charge the batteries or
provide battery backup power during a utility outage. 230 VAC/50 Hz units can not be stacked.

NOTE: Use tape to label the inverters as INVERTER 1 (L1) and INVERTER 2 (L2), for future
reference.

Series Stack DC Wiring (one disconnect device)

When stacking two inverters using one DC disconnect device, connect the units and batteries as follows:

• Tie the inverter’s negative terminals together using an appropriate length of cable (sized to fit).

• Connect one of the inverter’s negative terminals to the negative terminal of the battery bank.

• Tie the inverter’s positive terminals together using an appropriate length of cable (sized to fit).

• Connect one of the inverter’s positive terminals to the DC disconnect.

• Connect the DC disconnect to the positive terminal of the battery bank.

• Connect the Series Stacking Cable (SWI) to the STACKING port of both inverters.

• Connect the DC chassis ground lugs of both inverters together using a heavy gauge wire.

• Connect the negative end of the battery bank to a solid earth ground (refer to inverter installation manual).

NOTE: Connect the positive and negative wires to the batteries as show in the illustration
below. This ensures an even charge and discharge through the battery bank.

Figure 2-3

Series Stacking Using One DC Disconnect (Block Diagram)

+

+

DC

Disconnect

Negative

Tie

Series Stacking

Cable (SWI)

+

+

+

+

Positive

Tie

Inverter 1 (L1)

Inverter 2 (L2)

NOTE: Series Stacking

Cable connects on AC

side for SW inverters

DC Ground

Chassis Ground

Summary of Contents for SWI

Page 1: ...Stacking Interface C SWI Stacking Interface C SWI Stacking Interface C SWI Stacking Interface C SWI Stacking Interface Cable able able able able for SW and PS Series Inverters for SW and PS Series Inv...

Page 2: ...is guide Xantrex International assumes no responsibility for errors or omissions Note as well that specifications and product functionality may change without notice Since the use of this manual and t...

Page 3: ...Cette d claration est importante Suivre les instructions de pr s All electrical work must be done in accordance with local national and or international electrical codes Before installing or using thi...

Page 4: ...ent the possible buildup of explosive gasses If the batteries are installed inside an enclosure vent its highest point to the outdoors When installing batteries allow at least 1 inch of air space betw...

Page 5: ...ack DC Wiring two disconnect devices 10 Wiring with a Conduit Box 11 Battery Connections for Stacked Inverters 11 Series Stacking AC Wiring 13 Input Wiring SW Series Figure 2 7 13 Utility Input 13 Gen...

Page 6: ...of the utility grid or 120 240 VAC generator with L1 connected to the input of one inverter and L2 connected to the corresponding input of the other inverter i e AC1 of both inverters Stacking is als...

Page 7: ...2001 Xantrex Technology Inc All Rights Reserved P N 975 0013 01 01 Rev B 10 01 2 1 0 INTRODUCTION Notes...

Page 8: ...ently of each other however their output is phase locked and synchronized 180 degrees out of phase Both units can independently charge the batteries or provide battery backup power during a utility ou...

Page 9: ...L I N E I T E M R E S E T T O F A C T O R Y D E F A U L T S C O N T R O L P A N E L S E T P O I N T S H E A D I N G S M E N U G E N M E N U O N O F F M E N U Power Conversion Center TRACE ENGINEERING...

Page 10: ...vice connect the units and batteries as follows Tie the inverter s negative terminals together using an appropriate length of cable sized to fit Connect one of the inverter s negative terminals to the...

Page 11: ...s to the DC disconnect Connect a short cable from the DC disconnect to the positive terminal of the battery bank Connect a cable from the L2 inverter s positive terminal to the DC disconnect Connect a...

Page 12: ...tery bank must be used for both inverters To ensure even charging of the batteries each inverter must be connected to both strings i e positive cable to string 2 and negative cable to string 1 for inv...

Page 13: ...both inverters To ensure even charging of the batteries each inverter must be connected to both strings i e positive cable to string 2 and negative cable to string 1 for inverter L1 and positive cable...

Page 14: ...inal to the GROUND terminal in the L2 inverter Connect a wire from the neutral bus in the main service panel to the NEUTRAL IN terminal in the L1 inverter Connect a second wire to the NEUTRAL OUT term...

Page 15: ...2 AC HOT IN 1 AC HOT OUT NEUTRAL OUT NEUTRAL IN 2 NEUTRAL IN 1 AC HOT IN 2 AC HOT IN 1 Chassis AC GROUND Terminal SW INVERTER 1 L1 SW INVERTER 2 L2 Chassis AC GROUND Terminal NEUTRAL To Generator Gro...

Page 16: ...OUT terminal and route this wire to the L2 inverter s NEUTRAL IN terminal Keep this wire as short as possible Connect a wire from the main service panel s hot L1 line to the L1 inverter s AC HOT INPUT...

Page 17: ...e Gas Heat Fan Garage Doors Series Stacking continued Output Wiring SW Series The output of each inverter provides 120 VAC The voltage between the HOT outputs from the L1 and L2 inverter is 240 VAC Co...

Page 18: ...wire from the HOT 120 VAC output from the L2 L2 L2 L2 L2 inverter to the L2 terminal in the sub panel WARNING ENSURE THE ONLY NEUTRAL GROUND BOND IS IN THE UTILITY SERVICE PANEL REMOVE ANY BONDING FR...

Page 19: ...te the necessary neutral return line for the inverters and half the voltage for each inverter to 120 VAC The output of the inverter supplies both 120 and 240 VAC to the loads A Trace Series Stacking c...

Page 20: ...ub panel 3 Use an AC voltmeter and measure the voltage between the L1 terminal and neutral bus in the sub panel This voltage should be 120 VAC 3 4 Measure the voltage between the L2 terminal and neutr...

Page 21: ...ime To start an Equalize charge manually or automatically set both inverters to EQ accessible by pressing the green GEN MENU button on the SWRC This allows both inverters to charge at the equalize vol...

Page 22: ...t t t t t 1 360 435 8826 f f f f f 1 360 435 2229 drc xantrex com www xantrex com P N 975 0013 01 01 Rev B 10 01...

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