Answer Posted / nbs

that is depending on your back reqirment.you should metion
ups rating and how much time you need back, input voltage (
1 phase or 3 phase).
Hwre iam giving one example:
if you have Ups =5KVA
bacck ups requirent is = 2hr


batteries/battery capacity reqirement:

dischage current = 5000X 0.8
-----
0.9 X 12
=370.37 A

battery capacity = 370.37 X2 = 740.AH

you can take = 4 No.s x180 AH
total no.of batteries = four 180AH batteris

Note:
at dischage current , 0.9 inveter efficency
12v battery voltage

regarding safety what would u consider the most important rules to observe when inspecting electrical equipment?

2045

---

How to check the Bushings of the transformer?

1811

---

How does PLC work for sychronising of Two or more DG sets?

2068

---

I have doubt that the supply HZ (very low or high than rated ) may affect the power factor. is it true. ?

1663

---

What is the dc grounding system and what is diff between AC/DC grounding system?

2113

---

how to CHECK CT AND PT AT THE FAULT OCCUR IN GENERATOR RELAY PANEL .

2275

---

WHAT IS IM (INDEX OF MOUNTING )IN MOTORS

2029

---

what is smartµ grid technology?under coal gassification?

1946

---

There are Two questions about Steam Turbine Generator... What is HRSG bypass of LP, HP used for in power generation? In particualar, in the event that fault of HP bypass, there would be STG TRIP in operation but none on the LP bypass fault...what's the reason ?

2317

---

LET ME NOW MORE ABOUT icu and ics for circuit breaker. how we calculate the rating of circuit breaker and i c u and ics values

2867

---

How one can check the MAIN of a house wiring ?

1961

---

what is the difference between elcb and rccb ?

2332

---

Is phenomenon of resonance is harmfull fr the machine? if not or if yes please explain it?

1917

---

No load tap changing transformer working

1643

---

What is shutdown of electrical sub station?

2499

---