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Electrical Equipment
  • Home
  • Categories
    • Electrical distribution
    • Electrical Safety
    • Electrical software
    • Energy Efficiency – building
    • Energy Efficiency – kvar
    • Energy Efficiency – lighting
    • Energy Efficiency – motors
    • Energy Efficiency – news
    • Energy Efficiency – solar
    • Engineering Web tips
    • IEC standard
    • Panel Building
    • Power quality
    • Others
  • Resources
    • Electrical Calculation Tools
    • Electrical Engineering Forum
    • LED lighting resources area
    • Load Shedding Guide
    • Newsletters, archives
  • About us
    • How to help Electrical Engineering Community
    • Make a Comment, write a Post
    • Special thanks

Re: Back up system

Home › Electrical Engineering Forum › General Discussion › Back up system › Re: Back up system

2011/04/19 at 8:54 pm #11981
admin
Keymaster

KVA =53/.83

critical load = kva * .30

back-up system = critical load/.75 in kva

divide by system voltage to get amps

multiply by 8 to get amphours

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