YASKAWA XGI 1000-65/65 Installation And Operation Manual page 28

Installation and Operation Guide SOLECTRIA XGI 1000 (Rev D)
String Sizing
DC Overload
Exceeding the recommended DC to AC ratio may cause damage to the unit, and will void
the warranty.
Size strings according to information in this section and the applicable codes.
Each zone has four inputs, each with a positive and negative side. Connect the same number of PV modules in
each string landed in the same zone. Use the string sizing tool (https://solectria.com/support/string-sizing-tool/)
as a guide to help determine appropriate string lengths. It is the responsibility of the system designer to perform
all string sizing calculations to ensure proper operation and code compliance.
3.5.2.1 Parallel Mode
For factory configured Parallel Mode installations, perform the calculations based on the total inverter nameplate
power rating. With a maximum DC/AC ratio of 1.5 at STC conditions (Equation 3.1), a user can connect up to 90
kW (XGI 1000-60/60 & XGI 1000-60/65), and 97.5 kW (XGI 1000-65/65).
High Irradiance Installations
Note that for any application that may experience higher than 1000 W/m
basis, a smaller DC/AC ratio is recommended
The Maximum Short Circuit Current (Isc rating of all strings multiplied by 1.25) must be less than 180 A for
Parallel Mode (Equation 3.2).
3.5.2.2 Individual Mode
For factory configured Individual Mode. The maximum DC/AC ratio in Individual Mode follows Equation 3.1 on a
per MPPT zone basis. Each zone's maximum input power is 22.5 kW (XGI 1000-60/60 and XGI 1000-60/65)
and 24.4 kW (XGI 1000-65/65).
High Irradiance Installations
Note that for any application that may experience higher than 1000 W/m
basis, a smaller DC/AC ratio is recommended
The Maximum Circuit Current (combined Isc rating of all strings in the MPPT zone multiplied by 1.25) must be
less than 50A (Equation 3.3).
DC/AC Ratio and Current Limits
Both DC/AC ratio and current limits must be observed.
Failure to meet these requirements may result in damage and void the warranty.
DOCR-070733-D
����
����
≤ ��. �� ���� ������
����
����
∑ �� ∗ ��. ���� ≤ ��������
����
∑ ��
∗ ��. ���� ≤ ������
����
(Parallel Mode)
(Individual Mode)
2
on a regular
(3.1)
(3.2)
2
on a regular
(3.3)
Page 28 of 86