Interested to Buy Any Domain ? << Click Here >> for more details...
what is the formula to find battery back up of ups?
- 3 Answers
- 7518 Views
- I also Faced
- E-Mail Answers
Answer Posted / bala_vlsi
Fomula
Watt/d.c voltage )x 1 / (p.f )x (1/ Efficiency) x Required
Hrs
Example
Data
500 W = load
12 V = d.c vOLTAGE
0.9 = P.F (ASSUMED )
0.8 = mAINTAINANCE fACTOR(ASSUMED )
500 / 12 X (1 / 0.9 ) X (1 / 0.8 )X 2= 115 AH Battery is
need to priovide 2 Hrs back up supply
| Is This Answer Correct ? | 2 Yes | 2 No |
Post New Answer View All Answers
Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . y d.c series motor in train.train wheels r driven by D.C shunt motor ,at what voltage,and at what speed. please reply..............
What is dc current source?
How do you determine the size of transformer radiators in a transformer?
If the Brush of DC motor is shifted by 90 deg, then what happens to voltage and torque? Both voltage and torque are zero. how to justify the answer?
Why do you have to use Protecion relay with the function MTB ( Mechanical Trip Button ) for electrical system.
What is the polarization index value ? (Pi value)and simple definition of polarization index ?
what is size of 3phase 4wire cable to be used for 11 ton ductable A.C and how to calculate cable size for different load
ANY ONE TELL ME ABOUT generator synchronization panel panel to synchronise 3 gen of 250kva both automatic and manual. 2 gen output vol 415 3ph, 1 gen output vol 400 3ph SEND THE DETAILS DIAGRAM ON THIS EMAIL ADDRESS ayazleo@hotmail.com as soon as possilble best ragrds electrical engineer ayaz mahmood SAUDI TECH
what ispositive, negative, zero sequence impedence?
What is the difference between cylindrical-type and sandwich-type winding?
what are all the components required to assemble solar panel other than pv cell?
Why i receive the GCU fault in my DG Sychronization panel . what all the factors considered for this fault .
Minimum IR value of 1.1 kv grade 3.5c (300, 240,185,150,120,95,70,50,35,25) sqmm Aluminium XLPE cable and 4c (16, 10,6 & 4) sqmm cu arm cable between RY,YB,BR,RN,YN,BN,RE,YE,BE & NE.
Why the output of OP-AMP is always less than Vcc?
In dc ckt. 24v or 110v, which one is more efficient and why?
