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WECO XT Series Parallel Guide
(Max 10 in parallel, suggested 6)
1. Parallel System Diagram
1) The grid side power supply of the inverters are connected in parallel to the main grid through a 40A circuit
breaker, and the CT is installed at the parallel connection point. The CT communication only needs to be connected
to the master.
2) The inverters share batteries (Configuration 1), and the master BMS communicates with the inverter master
through CAN. The inverters share BMS information through parallel communication between units.
2.1) The inverters can also use independent batteries (Configuration 2), and each master BMS communicates
with its inverter. The inverters share information through parallel communication between units.
3) The load end of the inverters can be output in parallel to the total load.
4) The photovoltaic power supply of the inverters are provided independently.
5) CAN1 and CAN2 are parallel communication interfaces, connect the parallel inverters CAN in sequence as
shown in the diagram.
Configuration 1:
Battery Shared, CT Shared.
PV
GEN
GRID
LOAD1
LOAD2
PV1+ PV2+PV3+ PV4+ PV1- PV2- PV3- PV4- L1 L2 NL1 L2 NL1 L2 NL1 L2 N
PV
GEN
GRID
LOAD1
LOAD2
PV1+ PV2+PV3+ PV4+ PV1- PV2- PV3- PV4- L1 L2 NL1 L2 NL1 L2 NL1 L2 N
PV
GEN
GRID
LOAD1
LOAD2
PV1+ PV2+ PV3+ PV4+ PV1- PV2- PV3- PV4- L1 L2 NL1 L2 NL1 L2 NL1 L2 N
+-BMS_CAN L1
L2
N
PE
LOAD1
L1 L2 NPE
PE
PV1
PV4
PV*4
PV1
PV4
PV*4
PV1
PV4
PV*4
GRID
BATTERY
CT2
MASTER
SLAVE1
SLAVE2
CT1
CAN1 CAN2
BMS-CAN CT2 CT1
Configuration 2:
Battery Independently, CT Shared.
PV
GEN
GRID
LOAD1
LOAD2
PV1+P V2+ PV3+ PV4+ PV1- PV2- PV3- P V4- L1 L2 NL1 L2 NL1 L2 NL1 L2 N
PV
GEN
GRID
LOAD1
LOAD2
PV1+P V2+ PV3+ PV4+ PV1- PV2- PV3- P V4- L1 L2 NL1 L2 NL1 L2 NL1 L2 N
+-
LOAD1
L1 L2 NPE
PE
GRID
MASTER
SLAVE1
CAN1 CAN2
BMS-CAN CT2 CT1
L1 L2 NPE
CT2 CT1
PV4
PV1 PV*4
BMS_CAN
BATTERY
+-
PV4PV1 PV*4
BMS_CAN
BATTERY
PV
GEN
GRID
LOAD1
LOAD2
PV1+P V2+ PV3+ PV4+ PV1- PV2- PV3- P V4- L1 L2 NL1 L2 NL1 L2 NL1 L2 N
SLAVE2
+-
PV4PV1 PV*4
BMS_CAN
BATTERY
2. Parallel Communication Connection
The CT communication cables need to be connected to the master, and the parallel communication between the
master and the slaves can be connected through network cables hand by hand.
Install the inverters by connecting the power line in accordance with the local grid code.
ATTENTION: Keep the inverter OFF all the time during this operation.
Steps:
1. Identify the master inverter and connect the cable T568B into the port CAN2.
2. Identify the inverter slave 1 and connect the RJ45 cable coming from the Master CAN 2 to the CAN 1.
3. Identify the inverter slave 2 and connect the port RJ45 cable coming from the Slave 1 CAN 2 port to the CAN 1.
4. Proceed in Daisy chain up to the last inverter of your system.
5. Connect the batteries according to the configuration you want to implement (battery shared or battery
independent)
6. Once all power and data connection have been verified it is possible to start up the master inverter and in
sequence all the SLAVE inverters.
3. Parallel Operation Notes
1) Make sure all the units in parallel are with the same software version.
2) Connect the Master and slave to the WiFi module separately and set the relevant parameters of the host and
slave through the APP, keeping the parameters consistent.
3) Set parallel parameters.
⚫ Inv Parallel Num: Total numbers of the inverters.
⚫ Parallel Master/Slave: In a parallel system, the master unit broadcasts the BMS and other information to the
slaves. Make sure only one unit is configured as master.
⚫ Inv Parallel Addr: Local unit address. The master’s address should be 1, and the slave should be from 2
onwards.
⚫ Common Battery Enable: Common battery or independent battery. If the batteries are connected in parallel
and the master battery connected only to the master inverter (Configuration 1) please select “ON”.
If each inverter is connected to a separate master battery (Configuration 2), please select "OFF".
⚫ Common Grid CT Enable: Common CT or independent CT, if all AC inputs are connected in parallel and a
set of CTs is used, please select 'ON'.
⚫ 3 Phase Enable: It needs to be open during three-phase installation, please select "OFF" when single-phase
parallel connection.
⚫ Parallel Charge Current: Total battery charge current command under shared battery, only be settable in
master unit in parallel mode.
⚫ Parallel Charge Current: Total battery discharge current command under shared battery, only be settable in
master unit in parallel mode.
⚫ Inv Parallel Enable: Enable/Disable the parallel function. It needs to be turned on in parallel mode.
After setting up, if you need to change the working mode of the system, please modify the "Work Mode" of the host. The
slave does not need to change it and will run according to the working mode of the host.
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