Xantrex GT2.8-NA-240/208 UL-05, Owner'S Manual

Page: 35 / 90

Connecting the DC Wiring
975-0334-01-01 3–9
DC Wiring for Multiple Inverters
For installations with multiple GT Inverters, separate solar arrays are required for
each unit. The output of each GT Inverter feeds a separate dual-pole circuit
breaker (L1 and L2) in the main utility service panel.
For such installations, complete the wiring and perform the commissioning
procedure for each inverter one at a time. For the commissioning procedure, see
“Commissioning Multiple Inverters” on page 4–3.
WARNING: Shock hazard and equipment failure
Ensure each inverter is correctly connected to its own PV array(s) and that no wires are
crossed. If inverters “share” more than one PV array, an input current difference of over 1
A between arrays can cause each inverter to fail—the ground fault protection fuse will
blow, followed by short circuit failure. This failure will also generate hazardous voltages
at the DC/AC disconnect switch on each unit.
For example, connect PV1 positive (+) and PV1 negative (–) to inverter 1 and PV2
positive (+) and PV2 negative (–) to inverter 2.
Do not connect PV1 positive (+) and PV2 negative (–) to inverter 1 and PV2 positive (+)
and PV1 negative (–) to inverter 2. See Figure 3-6.
Figure 3-8 Improper Multiple Inverter Connections
Grid Tie Solar Inverter Grid Tie Solar Inverter
–
–
+ +
PV Array #1 (PV1)
PV Array #2 (PV2)
GT Inverter #1
GT Inverter #2
Grounding not shown.