How do you calculate the power of the battery?

A 12V but less than 20 Ah battery can't work normally.

20 ah is the capacity of the battery, not power. When the current is stable, the bigger the capacity is, may use the longer the power supply.

20 ah mean when the battery output current of 20, Ann can be used for 1 hour, can also be interpreted as the output current when the battery is 2, can be used for 10 hours, etc. Is the product of the current and time to 20.

When the device requires 20 ah, high-power battery can drive, the equipment working current is bigger, small capacity battery may not be able to withstand the high current. Such as small capacity battery can withstand the device driver can drive current. Like you more than a dozen 7 together to drive electric bicycle batteries, is driving up.

This is the capacity of the battery, not power, that is to be able to make a certain power of electrical work time, the length of working time depends on the size of the electric power.

In addition to 100 ah, also need to know the size of the voltage of the battery. The battery can be 1 hour at 100 amperes of current work, specific power depends on the battery voltage.12 v battery, for instance, if the working current is 100 amps, then you can make 1200 watts of electrical appliances work an hour, if use 10 amp, then you can work ten hours. Its working hour depends on how to use the current.

Battery power do not speak, speak "milliampere hours", namely can discharge time is how many mAh, is its capacity of electric power. New ordinary number 5 dry cell voltage is 1.5 V and about 1 ohm resistance. The voltage will reduce when it is not used. If the discharge current of 500 ma, can produce 0.5 v voltage drop, the output voltage is only 1 v. The larger the discharge current, the smaller the total discharge, and the shorter the life is. It also has shorter continuous discharge life.

From the unit to explain to you

Power unit watt (W), the P = UI, 1 W = 1 v. a. (one tile is equal to the volts.

When battery capacity mA. H (mA.)

Obviously, they are from two different parts.

Further find relationships:

Power electric work unit the joule (J)

By W = Pt

Unknown: 1 j = 1 w s = 1 v. A.s (a coke is equal to one ampere seconds)

If the battery voltage is known, with what you see get voltage multiplied by the battery capacity: unit V.m A.h

In fact and the unit of electrical energy essence is the same, under the conversion:

1V.mA.h=1V*10^-3A*3600s=3.6V.A.s=3.6J

Battery energy storage element, no power, he has a nominal capacity, unit is Wh, tile, use voltage times the capacity can be obtained, such as red rice

"12 V12Ah battery", is not to say that it is 12 * 12 = 144 watts!

"12 V12Ah battery" refers to the capacity of the battery. That is the rated working voltage of the battery to 12 V, if the discharge current is 1, can be used for 12 hours. If the discharge current is 0.1, 120 hours is available; If the discharge current of 0.5, is available 24 hours a day; And so on.

Battery and a index, is rated current. Generally use does not exceed the rated working current, battery service life is long, life is short. Otherwise, it is easy to make the plate due to excessive current peeling off].

"The 300 W lamp", requires that the battery discharge current is: I = P/U = 300/12 = 25 amperes. It can be used if it is within the battery rated current. You can use; Over, even more than a lot of, can't use.

Proper operating time: 12 when Ann / 25 = 0.48 hours. Ann [considering the inverter itself and the battery itself and the line is a loss, is shorter than 0.48 hours

1, "mAh" is the unit of battery capacity, the Chinese name is called mAh (in measuring large capacity batteries such as lead-acid batteries, for convenience, generally by "Ah", Chinese name is).

1 mAh = 0.001 amperes * 3600 seconds = 3.6 ampere s = 3.6 coulomb

2, the coulomb's power unit, the coulomb is not a basic unit of international system of units, but the international system of units derived units.1 coulomb = 1 amp, seconds.

Transport within 1 s 1 a current of electricity, which is 1 c = 1 a. s.

3, the electrical power calculation formula: P = UI.P is the unit of watts W; In the pure resistor in the circuit, according to the ohm's law in P = U = IR can also get the UI: P = I = U) (U * * IR/R

A, the most direct algorithm:

1, the first to get the current electrical equipment

2, battery capacity to be divided by the current results of electrical equipment is the length can be used

Such as:

A 3000 mAh, the rated voltage of 5 v battery to a 2.5 W power consumption, voltage of 5 v power supply electrical equipment, its theory of hours used for:

I=P/U=>2.5w/5v=>0.5A=>500MA

3000 mAh, the current is 3000 ma can one hour,

3000/500 = 6 hours

Second, through the charge coulomb algorithm

C = IS = > 3 a * 3600 s = > 10800 C coulomb (charge)

10800 c * 5 v = 54000 w power

54000w/2.5w=21600/3600s=6h

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