0
15 watt load battery 20 ampere-hour how much time battery used?
Wiki User
∙ 15y ago
Assuming your battery supplies a constant and exact voltage of 12VDC, then your 15 watt load will draw 15 W / 12 V = 1.25 A. Your battery can provide 20Ah, so you'll drain it in 20Ah/1.25A = 16h. Note these are only theoretical values; a real battery doesn't behave like that. The voltage is likely to be higher than 12VDC on a fully charged battery (more like 13..14VDC in a typical car battery, for example), and the voltage will drop over the discharge. Just how the voltage drops (how fast, how low) is a function of the battery (design, quality, age) and environment (temperature, possibly altitude).
Wiki User
∙ 15y ago
Add your answer:
Earn +20 pts
What does Wh and mAH mean on a battery?
The battery can supply an amount of electric charge measured in milliampere-hours, which expresses its capacity to supply a load of a number of milliamps for a number of hours. The idea is that if the load current is high, the battery lasts for less time, so the current times the time makes good measure of the capacity. It is also common practice to measure larger batteries in amp-hours, and there are 1000 mAH in one AH. This measure is a nominal one because in practice a high current load will give a lower AH capacity than when the load is small. Multiplying the voltage by the AH capacity gives the watt-hour capacity, which measures how much energy the battery can supply. This measures is also only a nominal only because as the battery runs down its voltage reduces.
What is meant by 26 amp hour batteries and how can we calculate the backup time of battery from this?
If you know how many amps your load draws then divide this into 26 and your answer will be the number of hours (approximately) you can sustain the load.
Describe the difference of V and Ah in a battery?
V is the batteries rated voltage. Ah is the amp-hour of the battery. This is a rating of how many amps it can supply for a given period of time. For example a 600 Ah battery with a 100 A load means that the battery should last 6 hours.
Where do you buy a battery checker?
auto parts store it measures the voltage of the battery and has a load of a reasonable size so voltage has some correlation to charge state. when batteries had external posts you could check them one cell ata time and know which cells to add water to now to test battery a cell at at time youll need to get a hygrometer theres one with assorted plastic balls of different densitys. about $1 and much better than electric test . there are some batteries now that are sealed so throw those away if the auto parts place wont give you $5 for it for a 9volt battery lil bity one you can get one at radio shack this can also check cells, has load resistors for AAA AA C and D.
How do you calculate back up time of battery?
battery backup is fully depended on battery discharge characteristics. discharge characteristics are c1 c5 c20 Need to consider c factor, calculating backup of batteries 100 AH BATTERY DISCHARGED BY 5 AMP CONSTANT = 100 AH 100 AH BATTERY DISCHARGED BY 20 AMP CONSTANT= 85 AH 100 AH BATTERY DISCHARGED BY 50 AMP CONSTANT=70AH 100 AH BATTERY DISCHARGED BY 100 AMP CONSTANT=50AH FOR KIND CONSIDERATION. FOR ANY CLARIFICATION CONTACT saalsood@gmail.com Battery back up time=Battery current at full load/Battery Ah
How much time backup An 20 amh battery with 15 watt load?
Nominally(11/3) times (the battery voltage) hours.
What two factors determine the output energy of a battery?
The energy delivered by a battery would depend on-- the battery's voltage-- the resistance of the load connected across its output terminals-- the length of the time the load is connectedThe power delivered by the battery is [ (voltage)2 divided by (load resistance) ].The total energy delivered by the battery is [ (power) multiplied by (time the load is connected) ].
How many watts in a 12v deep cycle battery?
Watts are the product of amps times volts. The amperage in a circuit is governed by the resistance of the load. A battery just supplies the potential as voltage, the load determines how much current is going to be drawn out of the battery. Batteries are rated in amp/hours. This means how long can a battery maintain a specific amperage over a period of time.
How much backup of 150ah battery?
Ampere Hour (Ah)The capacity of the battery is represented in Ah. It is the amount of current a battery can give during one hour of charge / discharge cycle. High capacity batteries (100 Ah, 150 Ah) are used to power inverters to get sufficient backup time. The formula to select the battery power (Ah) is Load in watts / Voltage of battery x Backup hour.For example if you wants to run 400 watts load on 12 volt battery for 3 hours, then the capacity of the battery should be minimum 100 Ah.Ah = 400 / 12 x 3 = 100 Ah. If the load increases (within the capacity of the inverter), backup time reduces.
Why does the battery on your 1992 Jeep Laredo die after a SHORT time of having the doors open and dome lights on?
If battery is original have it load tested (6 yrs old) time to replace?
How do you know how much amp you have in your battery?
this problem can be fixed by refferring to mannual of that battery and also can calculated by another way use a load 10 watt on your battery and measure the current flowing through it and note the current time after that when your battery discharge multiply the measured current from hour(during discharge period). this result is your amp-h rating of battery.
How do you calculate ah of battery?
You could put a know resistive load on the battery and then monitor the voltage across the load until the battery was at zero volts. Using Ohm's Law you can calculate the current at any time. Current = Voltage / Resistance. You can multiply the average current times the number of hours for the battery to go to zero.
How do you calculate battery amp hours?
C/20 is the formula most commonly used to describe a battery according to its amp hour rating; for instance a 400Ahr rated battery means that a 20 amp load placed upon the battery delivers at that rate of energy for 20 hours upon reaching the manufacturer's per cell rating, usually about 1.7 volts or 10 volts for a dead, discharged battery. There are different discharge or load ratings such as a 10 hour or 100 hour rating resulting in a different Amp Hour rating for the very same battery. A battery is an electrical potential energy source whose capacity (amount of energy density delivered over time) is determined by the rate/time over which the battery will deliver a set rate of load/discharge. The lesser the load, the longer the rate, the higher the load the shorter the rate.
Why does it load so slow it takes to much time for a movie to load up?
Get better internetszz!
Why does a battery have a certain shelf life?
Because the chemicals that are in it only stay good for a limited time. A reaction is ocurring in a battery from the time it is filled with the electrolyte. That can only happen for so long with or without a load.
What does Wh and mAH mean on a battery?
The battery can supply an amount of electric charge measured in milliampere-hours, which expresses its capacity to supply a load of a number of milliamps for a number of hours. The idea is that if the load current is high, the battery lasts for less time, so the current times the time makes good measure of the capacity. It is also common practice to measure larger batteries in amp-hours, and there are 1000 mAH in one AH. This measure is a nominal one because in practice a high current load will give a lower AH capacity than when the load is small. Multiplying the voltage by the AH capacity gives the watt-hour capacity, which measures how much energy the battery can supply. This measures is also only a nominal only because as the battery runs down its voltage reduces.
How long to charge 18 volt charger?
The battery itself should last almost indefinitely, although the charge on it won't. That depends what you use it for. If you load it lightly or not at all, such as leaving it on the shelf, it will last quite a long time. Whereas if you load it heavily, such as to energize a parallel bank of high-intensity incandescent lights, the life of the charge on the battery will be comparatively much shorter.
