How to calculate the ups battery back up? give the formula.

Answer Posted / a. dutta

To get one hour battery backup:

BATTERY AH = 1000 × VA × PF /( NO. OF BATTERY × BATTERY
VOLTAGE × LOAD% × PF

Is This Answer Correct ?    27 Yes 6 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

How to design the no. of ceiling fans required in 5mtr X 10 mtr X 3 Mtr hight room?

1649


L.A. (Lightening Arrester) is located at a place from where transmission line enters the transmitting substation. So L.A. (Lightening Arrester) is the first equipments which has to encounter with lightening, high voltage surges and switching surges. It has to absorb energy of lightening, high voltage surges, and switching surges. L.A. (Lightening Arrester) is made up of layers of semiconductors. If these layers can not tolerate energy released by lightening, high voltage surges, and switching surges the L.A. (Lightening Arrester) blasts.

645


hi pal, i am vengatesh from tamilnadu(chidambaram),i have called for the written test for the post of jr executive(ELECTRICAL) of AAI ,I dont know about the question paper pattern,so any kindly help me to face the examination,post me the model question papers and some tips to write my examination to (vengi.annadurai@gmail.com)

1416


Does the motor power displayed on the Motor name plate is the mechnical power motor delivers or it is consumed power from the system?

3318


what will be the maximum winding temperature of 6.6kv HT motor 450kw, Full load current 49A. 50Hz Frequency.

2733






I just purchased a 4 position cam switch to be used to operate a 3-speed blower motor. The motor is a 10 amp motor and has 3 wires that are used to control speed. The cam switch was rated at 660V 20 amps but when I received it, I noticed that it has AC-15 operational current rating (Ie) of 4/5 amps. If I am reading the label correctly. the 4/5 amps is related to 440v/220V (Ue). Other ratings are AC-3: 5.5A, AC2: 7.5A and AC-4: 1.5A. My questions are 1) Is it safe to use this switch with the motor I have 2) what is the difference between the 20 amp Ith ratting and the Ie operational ratings?

1195


Draw a block diagramof Three UPS systems connected in Parallel mode?

1642


What is the one main difference between ups & inverter ? And electrical engineering & electronics engineering ?

624


what is meant by re-rolling motor? how it differs from standard motor?

1431


in my working site. momentary jerck in electrical supply ocurred frequently which cause of multiple losses in our electrical equipements. how can we protect our electrical machines and equipements in this situation.

2581


i have total 8 dg sets for synchronizing and 2 buscoupler,1 sectoin dg no 1,2,3,and 2 sectoin dg no 4,5,6,and last section dg no 7,8 ....if buscupler no 1 and 2 is off mode ..than dg no 1,2,3,will synchroniz of another dg sets?

1323


How many size of cable required for a 300m long and 30kw inductive lode

881


what is the condition for YnD11

2044


what is auto re-closer?

1962


How to connect the chemical earthing and complete process tell me plz

1375