Connecting Multiple Inverters; Figure 3-6 Improper Multiple Inverter Connections - Xantrex GT2.5-NA Owner's Manual

Connecting Multiple Inverters

–
+
Grid Tie Solar Inverter
GT Inverter #1

Figure 3-6 Improper Multiple Inverter Connections

975-0245-01-01
http://www.wholesalesolar.com/inverters.html
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 20-Amp
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 wiring instructions, see "Connecting
the DC Wiring" on page 3–4 and "Connecting the AC Wiring" on page 3–7. For
the commissioning procedure, see "Commissioning Multiple Inverters" on
page 4–4.
WARNING: Shock hazard and equipment failure
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.
It is very important to ensure each inverter is correctly connected to its own PV array(s)
and that no wires are crossed. 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.
PV Array #1 (PV1)
http://www.wholesalesolar.com/inverters.html
Connecting Multiple Inverters
–
+
PV Array #2 (PV2)
Grid Tie Solar Inverter GT Inverter #2
3–9