Answer / mahavir jagdev

The battery is rated in ampere-hour. It means either "X" NOS OF AMPERE CURRENT WILL BE DELIVERED FOR "Y" NUMBER OF HOURS BEFORE IT GETS DISCHARGED , so the ampere-hours will be XxY.

The back up time will depend on the load applied to the battery in terms of watts/kws ....... amp-hrs divided by watts

Answer / shivaleela

Ampere Hour=(Watts/DC Voltage)*(1/Inv.Efficiency)*
(1/Batt.Efficiency)*No.of Hours

Ex:W=500W V=12V Inv eff.=0.9 Batt.eff=0.7 Time=1hour

Then Ah=(500/12)*(1/0.9)*(1/0.7)*1
=66.13
It means for 1 hour backup we can use 65Ah Battery for
500W/12V Inverter.
Similarly,for 2 hours Ah=65*2=130Ah

what is diffrence between neutral and earth wire

23 Answers   Bhel, Esab, MTNL,

---

when giving a supply to wounded coil it will get magnetised, but the same is not if it is not wounded on a core..and it is getiing short....why.......

3 Answers  

---

Why we generate power at multiple of 11 i.e 11kv,33kv etc.

9 Answers   DTV Solutions, Havells, TCS,

---

Why we use mho Relay in long transmission line?

0 Answers  

---

WHY SECONDARY OF CT SHOULD NEVER BE KEPT OPEN CIRCUITED?

7 Answers  

---

Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?

0 Answers  

---

How can calculate ups battery back up time?

25 Answers   Cisco, Cooper, Pronet, Wipro,

---

why phase to phase voltage is 400v while phase to neutral is 220v?

1 Answers  

---

how does calculate loss correction factor in transformer

1 Answers  

---

what is the avr

6 Answers   ArcelorMittal, Heidelberge Cement,

---

when a hand crancked meggar is used to check most three phase induction motors, how many tests r rquired? Why?

1 Answers  

---

what is the exact meaning of power

1 Answers   SKB,

---