enphase IQ System Controller 1 Technical Brief page 5

cord is an example of a suitable extension cable with NEMA L14-30P plugs. The extension can also be
made from a 4-conductor cable and an L14-30P plug. The Recommended length is 50 ft to 75 ft to allow
generator connection capability from pickup trucks or difficult-to-reach areas.
Multitap connectors and wire
The AC combiner and the generator lugs in the IQ System Controller are rated for 2 AWG to 14 AWG Cu/AL
wires. Insulated multitap connectors connect L1 and L2 wires from the generator extension cord to the
IQ System Controller lugs. Carry at least two multitap connectors, one for L1 and another for L2. An
example of a suitable multitap connector is the
that support a minimum conductor size of 14 AWG and a maximum conductor size of 1/0 AWG. Use one
port of the multitap lugs to connect the generator. If required to power the IQ Gateway, use the second
port to power the IQ Combiner. This is needed mainly when the IQ Gateway is powered by the IQ Combiner
bus bar. Figure 1 shows the arrangement of L1 and L2 wires when a 3-lug multi-tap is being used.
Procedure
Recovery via the IQ Combiner lugs of IQ System Controller
This recovery procedure is a universal method that works with all IQ System Controller types and all
system eSW versions. That is the advantage of this method. However, only the generator power can
charge the batteries, while the available PV power cannot charge the batteries.
When the battery state of charge reaches 2% or lower without AC power, the automatic charge
recovery algorithm is turned off, and all electronics within the battery are shut down to prevent
irrecoverable damage to the batteries. Follow this procedure to recover the batteries from a
deficient state of charge.
WARNING: This procedure involves multiple high-voltage sources of power. To ensure the
installer/electrician's safety, perform the following steps in sequence.
1. Turn off the grid supply to the IQ System Controller.
Disconnect the utility supply from the IQ System Controller to de-energize the conductors entering
its utility input.
•
If there is a utility system disconnect (outside the IQ System Controller and connected
to the utility input of the IQ System Controller), turn off the utility disconnect.
•
If there is a panel on the utility side of the IQ System Controller, turn off the breaker
feeding the IQ System Controller in the panel.
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State of charge recovery for an Enphase Energy System
POLARIS bagged insulated multi-tap connector with 3 lugs
Figure 1. An example of a 3-lug multi-tap connector
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