Dear All, I have 100 no of motors running on star delta panels individually. but because of this we have to much power consumption. now i am looking to change these star delta panels with VFD. if any one can guide me how can i calculate overall energy consumption through VFD for a one machine let 100KW. I just want to know does it really reduce the energy consumption if i run these machines on VFD??? if yes then how can i calculate this reduction in energy??