Parallel Application - SolaX Power X3-ULTRA User Manual

15.6

Parallel Application

Introduction of Parallel application
This series of inverters supports parallel operation in both grid-tied and off-grid modes. It
can be paralleled without an external parallel cabinet, supporting a maximum of 3 units, or
with an external parallel cabinet, supporting a maximum of 10 units.
Requirements for parallel connection
• All inverters should be of the same software version.
• For optimal performance, it is recommended to maintain consistency in the
models of inverters within a parallel system and connect them to the same model
and quantity of batteries.
• In a parallel system, there are three status: Free, Slave and Master.
Only if no one inverter is set as a Master, all inverters are in
Free
free mode in the system.
Once one inverter is set as a Master, all other inverters will enter
Slave slave mode automatically. slave mode can not be changed from
other modes by LCD setting.
When one inverter is set as a Master, this inverter enters master mode.
Master
Master mode can be changed to free mode.
• Master inverter has an absolute lead in the parallel system to control all slave
inverter's energy management and dispatch control. Once master inverter has
some error and stop working, all slave inverter will be stop simultaneously. But
master inverter is independent of all slave inverter to work and will not be affected
by slave inverter's fault.
• Overall system will be running according to master inverter's setting parameters,
and most setting parameters of slave inverter will be kept but not be cancelled.
• Once slave inverter exits from system and be running as an independent unit (the
network cable is disconnected simutaneously), its all setting will be re-activated.
• The parallel system is highly complex and requires the connection of numerous
cables. Therefore, it is crucial to strictly follow the correct wiring sequence
when connecting the cables. Failure to do so may result in equipment and load
damage.
Appendix
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