INTRODUCTION
 
Solar On grid and UPS system solution is an advanced power management system for own used solar power solution. Unlikely the traditional on grid power system, it produce the power for local loading firstly, remain power would feed back to grid on the day time. And then the UPS would support the night time loading. Finally, the battery should be chargeable on the day time by solar or utility power. It is ensure that the power source never interrupted in spite continuous of cloudy or rainy days and also battery fault due to low voltage or any other reasons. 

  Illustration
(1)    DAY TIME LOADING (The NAPO is normal and Generator switch on)                                                                                                                          
SOLAR POWER > LOADING
      The solar power should go to the loading firstly, and the excess power feed back to the NAPO
        SOLAR POWER < LOADING
      The  NAPO should compensate the difference among solar power and loading

(2)    DAY TIME LOADING (The NAPO is abnormal and Generator switch on) 

SOLAR POWER > LOADING
      The solar power should go to the loading
        SOLAR POWER < LOADING
      The generator should compensate the difference among solar power and loading

(3)    NIGHT TIME LOADING (The NAPO is normal & Generator switch off )                                                                                              
All of device should be loaded by NAPO power

(4)    NIGHT TIME LOADING ( The NAPO is abnormal and Generator switch off )                                                                                                                        
The battery should be backup the loading until NAPO or Generator come back to the system