1. Description of system

Independent solar system means the power only comes from solar panels. In the daytime with sunlight, the solar panels will power the loads and charge the battery; when the sunlight is inadequate or on cloudy days, the battery will power the loads together with the solar panels; In the night, the battery will power the loads independently until the next sunny day comes. 

If the battery bank cannot stand to the next sunny day, the system will cut off the power when the battery reaches its maximum discharging capacity. 

When the load power is confirmed, the number and probability of consecutive cloudy and rainy days for local region should be taken into consideration to determine battery maximum powering time and how long  it needs to fully charge the battery, then, finalize the configuration based on these conditions.

2. Project case

China Telecom-2590Wp system+300w loads+72 hours back-up  solar power project in Shigatse, Tibet Autonomous region.

China Mobile-5920Wp system+600w loads+72hours back-up solar power project in Reqingsi, Tibet Autonomous region.

3. System configuration

a. 24V solar power supply system

List of configuration1.2m cabinet controller(XB120)2m cabinet controller(XB200)Wall-mounted controller(XX44U)
Central control module 1Unit 1Unit Self-contained central control unit
Solar module 100A~600A 100A~900A 50A
Rectifier module 50A~1200A 50A~1200A
Inverter module 100VA~6000VA 100VA~6000VA
Maximum PV input 16.8kWp 25.2kWp 1.4kWp

b. 48V solar power supply system

List of configuration1.2m cabinet controller(XB120)2m cabinet controller(XB200)Wall-mounted controller(XX44U)Wall-mounted controller(XX55U)Wall-mounted controller(XX70U)
Central control module 1Unit 1Unit Self-contained central control unit Self-contained central control unit Self-contained central control unit
Solar module 100A~600A 100A~900A 50A 100A 200A
Rectifier module 30A~720A 30A~720A
Inverter module 100VA~6000VA 100VA~6000VA
Maximum PV input 33.6kWp 50.4kWp 2.8kWp 5.6kWp 11.2kWp