Selected equipment basis and preliminary compatibility check
This example uses published manufacturer data to make the stringing
decision traceable. The products are representative only and are not a
procurement selection.
Check
Calculated result
Limit and disposition
Nominal DC array
136 × 550 W = 74.8 kWp
60 kW AC total; DC/AC ratio 1.247
String Vmp at STC
17 × 41.95 V = 713.2 V
Within the 200-1000 V MPPT range
String Vmp at NOCT
17 × 38.97 V = 662.5 V
Within range; hot-cell Vmp is project-specific
Cold string Voc at -10°C
952.9 V, including +3% Voc tolerance
Below the 1100 V maximum input voltage
Cold string Voc at -40°C
1022.2 V sensitivity check
Below 1100 V at the module's lower operating limit
One string per MPPT
Imp 13.12 A; adjusted Isc 14.72 A
Huawei 24-202401: 20 A/input, 27 A/MPPT; 40 A short-circuit/MPPT
Manufacturer references:
LONGi LR5-72HPH data sheet, 20211101V14
and
Huawei SUN2000 M3 data sheet, version 24-202401.
The referenced M3 data sheet specifies 27 A per MPPT. Confirm the supplied equipment revision, site temperatures, protection and grid requirements for the project.
Single-line diagram
Eight strings, two inverters, AC distribution, grid connection and monitoring. Drawing SS-CPV-SLD-001, P06.
Switch contacts are shown open by drawing convention; they do not record operating state or establish safe isolation. Cable sizes, protective-device ratings, fault duty, RCD requirements, surge protection, export control, and local grid requirements remain project-specific.
