SMA E-Panel installation manual
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AC Coupled Systems.
AC coupling allows a grid-tie system to also provide backup power during an outage. Grid tied systems are
required to stop sending power to the grid immediately upon a power failure. This is for the safety of the
linespersons effecting repairs as well as others who may encounter downed lines. Most inverters shut down
completely at this point leaving you in the dark while your array or turbine are producing unused power.
In an AC Coupled system when the power fails the inverter is disconnected from the grid but continues to
supply power to the critical loads panel. The array or turbine continue to send their power to the batteries
for charging or running loads. The SMA Inverter used in this system is particularly adept at this form of
coupling giving you the best of both worlds of grid-tie and power backup.
Generator hookup to a standalone system vs. an AC coupled system.
Off Grid
the generator goes to the AC input on the inverter.
Utility connected non grid tie system
the generator and inverter go to a switch (Not included) so that the
inverter is fed by the grid or the generator. This may be automatically or manually switched depending on
the system.
Off Grid
the generator goes to the AC input on the inverter.
Utility connected non grid tie system
the generator and inverter go to a switch (Not included) so that the
inverter is fed by the grid or the generator. This may be automatically or manually switched depending on
the system.
AC coupled grid tied single system
the generator then goes through the normally open contacts of a relay
(sold separately) and then to the inverter.
Inverter wiring and wiring between E-Panels complete. Ready for AC/DC in and out connections.
Master
unit
Slave
unit
