Answer / markandeya

total number batteries=votage required/votage of indivedual
cell
Ah value of indivedual battery=1.5*current*time(hours)

for an example:
votage required is 240
cell voltage is 12
then we require 20 cells.

if load is 1 kVa time is 10 hrs
we need 60 ah is required

Answer / jagdish raval

UPS KVA= 1. Then KVA= VA/1000. So I=KVA*100/V. If the V=48,
Then I=21. The load of UPS is 21Amp and it have run for 10
Hours, So Battery Capacity should 210Ah.

why connecting surge unit in contactor coil

0 Answers  

---

WHAT IS VCB SAFETY

0 Answers  

---

why cont we short earth and N.......?

3 Answers  

---

why is the vector group analysis done in transformer tests

28 Answers   K K Rao, Lloyds, Nicco Engineering Services Limited, Qatar Petroleums,

---

Is it required to use 2 nos of body earthings to any machine though if we use TP with E supply is provided to Machine?

2 Answers   HAL,

---

---

What is the PIU.

1 Answers   Jindal,

---

Difference in load break switch, isolator and circuit breaker.

1 Answers   KSEB, L&T, Siemens,

---

How to calculate the CFM to TR? What is the Formula

12 Answers   Carrier, Voltas,

---

What is the Powar consumption of fan low speed to full speed? is it same ?

3 Answers  

---

What is C check in a diesel generator and what are parts and what has to be done during the C check

4 Answers  

---

Why? We r used 50sq. mm. And above size cable in 3.5 core and below size are used in 4core

2 Answers  

---

what is the difference between neutral and earth?

2 Answers  

---