Answer / shailesh singh

Battey backup(va)=mah×v×n of battery/watt

Answer / sathiyanarayanan

backup formula= KVA/DC LOW *POWER FACTOR

FOR EX:2 KVA/120 DC VOLT(SYSTEM VOLT)OUR MAINTAINED POWER

FACTOR (0.8 P.F),PER BATTERY=12V(DC LOW=10.8),HERE USING THE

SYSTEM VOLT=120V SO,10 BATTERIES-10*12=120V


DERIVATION : 2000/108*0.8

AH=14.81(APP.17 AH BATTERY) given 30 minutes backup

Answer / chetan singh

Battery Volt X No of Battery X Battery AH / Load in watt

Answer / srini

what is 130

Answer / mehboob

( Battery Voltage * AH Rating * Efficiency) / VA Rating =  X
X * 60 = Estimated Run Time in Minutes




So let’s pretend we’re looking at a theoretical UPS unit that has the following specs:




VA Rating: 700
Battery Voltage: 12
AH: 9
Efficiency: 0.9 (90%)




When we plug those numbers into the equation we get the following:




( 12 * 9 * 0.9 ) / 700 = 0.139
0.139 * 60 = 8.3 minutes

In a three-phase full converter, output voltage pulsates at frequency of a. f b. 2f c. 3f d. 6f

2 Answers  

---

How i can decide that HVDC line is best for transmission.

0 Answers  

---

what happen if the battery is charged by more than one source ,for ex: connecting data cable to laptop & charger pin to source supply ? 

2 Answers  

---

what is two wattmeter test

2 Answers   Jindal,

---

why inuctive drop is not consider in DC MOTOR

2 Answers  

---

---

what is sinwave ups

1 Answers   Exide,

---

what is the difference between PLC and embedded system

3 Answers  

---

In ac circuit R,L,C are connected in series what is the output the circuit? explain

4 Answers  

---

why we have to do tan delta test of the transformer oil???

5 Answers  

---

Input power is 380 - 450 V but with 45 - 55 Hz frequency - desired output is 415 V and 50hz with 1% variation permissible. CVT / Servo dont stabilize the Frequency - what is best solution??

7 Answers   IOCL,

---

what is the use of capacitor bands?

2 Answers  

---

what is neutral grounding resistor?

3 Answers  

---