Answer Posted / avinash

First you must know the ampere-hour of your battery bank as
per the manufacture's specification.Now discharge the
batteries as per the C5 rating( for Ni-Cd batteries) or C10
rating (for Lead -acid Batteries).Discharging can be done
by connecting the positive and negative terminals of
batteries to the copper plates and immersing in a salt
solution, which will act as a load. The distance between
the plates can be adjusted to set the discharge current.
Measure the amount of discharge current and time till the
battery voltage of each battery in a bank drops to 1 Volt
if it is a 1.4 volt cell. Now multiply the discharge
current and time. This is the measure of the Amperehour
capacity of the bank.If the Amppere -hour capacity as per
the manufacture is available then you can determine the
percentage capacity of your bank at present.Remember that
charging and discharging of battery bank improves the
health of the battery bank.However, for lead -acid
batteries these cycles are around 750 or say 3 years. For
Ni-Cd batteries the life is around 25years or more if
maintained properly.Selecting a overated battery is also
not adviseable as it won't get discharged completely and
this may result in sulfation of batteries and early death
of battery bank.

how we decide the require size is this for a known current at fuu load?

1961

---

What will be advantage if we put some load in neutral of grounded star transformer & loadshortcircuit current,rated current of cable & MCB with example?

1845

---

Is any generator is developed which is operated with out diesal or other expensive source?

2106

---

700KW 6.6KV slip ring induction motor to use VFD to control the speed

3206

---

what is through fault?

2282

---

1) What are your personal strength? 2) What are your personal areas of improvement? 3) What are your expectations from from a particular job? 4) what are your carrier objectives?

2517

---

Please tell me the formulaes while designing a substation for power Calculations in designing a 33 KV Substation?????

1815

---

What should be the values of settling time, peak time, steady state error, overshoot, rise time, MPOS (Maximum percent over shoot) to keep the system in transient state, to keep the system in steady state ?

2251

---

State norton’s theorem?

1105

---

Can any body tell gulf interview question for experienced electrical engineer ?

2108

---

from which formula we select a capacitor rating?

2119

---

when qty of cable being purchased is not sufficient according to the standard,what should the inspector do to ensure its quality according to the standard?

2077

---

what exactly commisioning work does in electrical site work... LT side?..

1934

---

how choose conductor&depending upon load

1902

---

please give me all the Alarm .Trip ,Safety Relays & Conditions of Diesel-generators mail me on ashokbabunhce@gmail.com

1962

---