Installation and Operation Guide SOLECTRIA XGI 1500 (Rev A, April 2019)
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DC Connections
3.8
The PV source circuits must be combined external to the inverter using equipment such as the XGI Remote
Combiner box or the XGI Attachable Combiner box.
3.8.1 General DC Connection Information
The SOLECTRIA XGI 1500 is a single DC input into one MPPT zone.
Perform the calculations based on the total inverter nameplate AC power rating. With a maximum DC/AC ratio
of 1.5 at STC conditions (Equation 3.1), a user can connect up to 188 kWp (for XGI 1500-125/125 or XGI
1500-125/150), 225 kWp (for XGI 1500-150/166), or 250 kWp (for XGI 1500-166/166). See Table 3-5 DC Input
Specifications. Note for any application that may experience higher than 1000 W per m2 on a regular basis, a
lower DC/AC ratio is recommended. Also, the sum of the Isc rating of all PV source circuits multiplied by 1.25
must be less than 320 A (Equation 3.2).
≤ 1.5 at STC (3.1)
∑
𝐼
∗ 1.25 ≤ 320A (3.2)
DC/AC Ratio and Isc Requirements
Both the DC/AC ratio and Isc limit requirements must be met.
Failure to stay within these limits may result in damage NOT covered under warranty.
3.8.2 DC Input Specifications
Table 3-5 DC Input Specifications
XGI 1500-125/125 XGI 1500-125/150 XGI 1500-150/166 XGI 1500-166/166
Max Operating DC
power
127 kW 127 kW 152 kW 169 kW
Max DC rated power
allowed
188 kW 188 kW 225 kW 250 kW
Absolute Max open
circuit Voltage
1500 VDC
Operating voltage 860 - 1450 VDC
Max power input
voltage range (MPPT)
860 - 1250 VDC
Maximum operating
input current
148.3 A 148.3A 178.0A 197.7 A
Maximum PV Current
(Isc x 1.25)
320 A
Maximum Allowed DC
to AC Ratio
1.5
Risk of Electric Shock or Fire
Use only with PV modules, DC conductors, switches, fuses, and fuse holders with a
maximum system voltage rating of 1500 VDC or higher.
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