IQ System Controller System Shutdown – North America
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3. Manual Transfer Switch for Bypass
Some homeowners and installers may find this manual override sequence too complicated and
cumbersome. We are working on simplifying this process on next generation of our IQ System Controller
smart switch that is currently under development.
If installer wants a one-step manual override to connect home to grid with the existing ie., 1st revision of
the IQ System Controller smart switch, a manual transfer switch can be used as a bypass for IQ System
Controller. Manual transfer switches occupy a large amount of space physically, but they offer a single
step electrical bypass procedure. The manual transfer switch is installed on the load side of IQ System
Controller; it allows the backed-up loads power supply to be switched between the IQ System Controller’s
load lugs/breaker and the direct supply from the grid. Since the manual transfer switch ensures that the
power is only available to the backed-up loads via a single current path, there are no parallel current
paths in the system that would violate code requirements.
With the manual transfer switch, there is no need to perform any other steps to turn off IQ Battery or IQ
System Controller. The installer or homeowner needs to simply move the lever of the manual transfer
switch to the position that connects the backed-up loads to the grid while breaking the current path from
backed-up loads to IQ System Controller. Note that IQ System Controller is still connected to the utility
grid hence the IQ System Controller stays powered, even though from the perspective of the homeowner
the IQ System Controller and therefore the Enphase storage system have been bypassed.
As shown in the diagrams below, in the Normal mode, the manual transfer switch has IQ System
Controller connected to the main or sub panel. When IQ System Controller needs service (Override
mode), homeowner can turn the manual transfer switch to connect the grid to the main or sub panel.
Normal mode:
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