Assumption Calculation Home › Electrical Engineering Forum › General Discussion › Assumption Calculation This topic has 1 reply, 2 voices, and was last updated 13 years, 10 months ago by admin. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts 2010/12/06 at 4:50 am #10292 s faisalParticipant Hi.Need assistance to calculate or relevant formula…If i have a UPS unit(1000va) output 4.3A.and i want to use an equipment that consumes 20watt,how long can the ups stands? 2010/12/10 at 4:23 pm #11671 adminKeymaster it will give back up for 20 minutes Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In