1. Battery is a device which is stores DC voltage.
2. Battery stores electric charges in form of chemical energy and converted them into electrical energy when needed.
3. There are three types of power in our system.
4. Apparent power which has a unit of VA(volt amp).
5. True Power which has a unit of watts.
6. Reactive power which has a unit in (VARS-Volt amp reactive).
7. These all three power factors used only for the AC circuit.
8. Battery is DC and having a unity power factor because DC has not frequency.
9. So in the case of battery we only interested in an ampere rating for a specific time.
10. So the battery is rated in AH, not in wh(VA)
Some interesting calculation for battery
If 4 nos of 12V, 200AH batteries are connected in series then total Ah & Voltage of batteries?
A. 12V, 800Ah
B. 48V, 200Ah
C. 48V, 800Ah
D. none Of above
Ans: B. 48V, 200 Ah
Explanation :
Here given that
Battery Nos = 4 batteries
Each battery Voltage = 12V
Each battery Ah = 200Ah
Battery Connected = In series
In a battery, the series formula is given below
V=V1 + V2 + V3+ .......... + Vn
In the case of series connection battery Ah remains the same and battery Voltage is additive.
here battery connected in series so battery Voltage is
V= V1 + V2 + V3 + V4
V = 12 + 12 + 12 +12
V= 48 V
In series connection of Battery Ah remain the same 200Ah
so here ans is 48V, 200Ah
If the above battery are connected in parallel then
I=I1 + I2 + I3 + I4
I= 200 + 200 + 200 + 200
I= 800Ah
In the case of parallel connection, Current means Battery Ah additive and voltage remain the same.
Good to Know :
If the battery connected in series then the battery Discharge slowly.
If the battery connected in parallel then the battery Discharge quickly.
If the battery is connected in series and two or more bulbs connected with this connection bulb dimmer because the voltage not remain the same for each battery.
If the battery is connected in parallel and two or more bulbs are connected with this connection bulb Britten because Voltage remains the same for each battery.
In 110V DC voltage system, 55 Nos of 2V, 100Ah cell are connected in series so total system voltage becomes 110V and ampere capacity remains 100Ah, this system mostly used in 66Kv substation for protection system.
In series, connections have only one current path.
In parallel connections have two or more current paths.
Do not short positive and negative terminal of the battery to avoid short circuit and explosion in the battery.
Do Not try to recharge non-rechargeable battery cells.
Don't try to connect the battery directly to the AC supply. If we connect the battery directly to AC supply Blast occurs in the battery. Which causes serious injury.
Battery rated in Ah (Ampere hour).
Charging time of 200Ah battery is?
A. 12.8 hours
B. 13.0 hours
C. 14.0 hours
D. 12.7 hours
Ans: D. 12.7 hours
Explanation:
Here given that
battery Ah ratting = 200Ah
charging current of battery should be 10 % of Ah ratting
so Charging current=200 * 10/100
= 200 * 0.1
= 20 A
Due to Some losses we take more Amp 20-22A
If we Take 22A for charging purpose of battery
Formula for charging time T = battery Ah / battery charging Amp
Here is given that
battery Ah= 200Ah and battery charging Amp =22A
Charging Time T = 200 / 22 =9.09 hrs
this is only for the ideal case
But in actual case 40 % or more losses occurred in battery charging
so battery Ah = 200 * 40 % losses during charging time
= 200 * 40 / 100
= 80 Ah
so 80Ah increased due to losses
so now total Ah = 200Ah + 80 Ah
= 280 Ah
Now battery Charging time = battery Ah / Charging current
= 280 / 22
= 12.7 hours
So the time required for battery charging is 12.7 hours
Good to Know :
- Battery stores potential energy in form of potential energy when required it converted into electrical DC power.
- The battery Has two-terminal one is the positive terminal and the other is the negative terminal. The positive terminal is known as the cathode terminal and the negative terminal known as the Anode terminal.
- There are Active and passive components in our system and the battery is the active component.
- The service life of the battery is 5-10 years only.
- Battery cell polarity charged during charging and discharging cycle.