Cable Installation
1. Before making any connections, ensure all breakers are open (off). Use a multimeter to
confirm the AC input lines (L1, L2 and neutral) are not carrying current from the main panel.
Verify the DC input lines are not carrying current. Verify the PV input lines are not carrying
current.
2. Strip off 5/16 – 3/8 in. (8 – 10 mm) insulation from the AC cables.
3. Fasten the AC input wires into their respective mechanical lugs using the proper torque
ratings shown in the table above. Fasten the neutral wire into the neutral bus (labeled N in
the inverter).
4. Always be sure to connect the AC Output ground wire to the Ground terminal bus (labeled
PE in the inverter) before installing AC Outputs L1 and L2.
7.4 NEUTRAL-GROUND BONDING
The information below describes the nature of the neutral and ground in the inverter and their
relationship to the system. Always consult with the installer or a licensed electrician to ensure that
the right configuration is being used:
• The neutral line is a solid connection between AC input and AC output (known as a Common
Neutral Architecture).
• The neutral line between the AC input and AC output is never disconnected.
• This architecture assumes there is a single neutral-ground bond in the system. The system
should have only one neutral-ground bond (this is typically the Main Bonding Jumper located at
the first grid system disconnect. However, if there is no neutral-ground bond in the system, the
12000XP can be configured to create the bond internally (see N-PE Connect setting on page
40).
7.5 GENERATOR CONNECTIONS
The EG4
®
12000XP inverter has the ability to utilize a generator in two different ways. The first
option is more traditional where the generator must be sized larger than the inverter output. In this
case, a 15kW generator is recommended for backup power in the case of grid failure. The second
option is to use a smaller generator in combination with batteries to provide power for the loads. This
feature is called Gen Boost. See the LCD settings and Monitor Center sections for more information
on proper setting configuration.
When attaching generators directly to the generator port, the Total Harmonic Distortion (THD) of the
generator must be <3%. To achieve this optimal THD value, it is recommended to size the generator
for at least 1.5x the output of the inverter to allow for powering loads and charging batteries. The
table below shows the recommended generator capacity for optimal operations. There is no need to
size the generator larger than the loads when using the Gen Boost feature.
WARNING:
The 12000XP does not have the functionality to support a dynamic bond. The
bond is either always enabled or always disabled.
NUMBER OF INVERTERS IN PARALLEL
RECOMMENDED GENERATOR CAPACITY
2 12kW – 30kW
CAUTION:
Generators with >3% THD may not be compatible with the 12000XP.
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