There are some types of batteries, such as solar generators, that by convention tend to describe their capacity in watt hours. For instance, let's say you own the Jackery Explorer , a solar generator with a Wh capacity.
To calculate your generator's amp hours, you first need to find its battery voltage. You look online and see that the Explorer has a So, to convert amp hours to kilowatt hours, you first convert the amp hours to watt hours and then divide by Let's say you own a 12V Ah lithium battery. To convert its amp hours to kilowatt hours, you'd do the following:. So, to convert milliamp hours to watt hours, you multiply millamp hours by volts and then divide by Hi, I'm Alex.
Virtually all equipment and appliances have power consumption ratings in terms of watts. A watt fluorescent lamp, for example, consumes electric power at a slower rate than a toaster with a 1,watt rating.
Watts multiplied by hours gives watt-hours, a measure of total energy consumed over time. If you run the 1,watt toaster for five minutes, that is one-twelfth of an hour times 1, watts or If you leave the watt fluorescent lamp on for six hours, it is a total of 90 watt-hours -- more total power consumed.
Your electric meter measures kilowatt-hours, or units of 1, watts an hour. To make the meter advance by one unit, the appliances, lights and electronics in your house consumed 1, watt-hours of energy. The batteries differ not only by size, but also by capacity: the larger the battery, the greater its current capacity. For large batteries, this is measures in amp-hours; for small batteries, it is milliamp-hours.
The voltage has remained the same but the number of amps has gone up. This is the amount of energy consumed by a device and therefore an indication of how powerful it is. This goes up when the number of amps also goes up. The engine runs on 12V and draws 15A and thus has a power consumption of W 12 x The power consumption of the trolling motor is now W.
Battery capacity is measured in Ah, or Amp-hours. As the name suggests this means how many amps the battery can deliver in an hour. For example, a 12V lithium battery with a capacity of Ah can deliver Ah to a volt device for one hour. If a battery has 12V50, this means that the battery works on 12 Volt and has a capacity of 50Ah. A 24V battery works on 24 Volt with a capacity of Ah etc. In practice for lead-acid batteries the nominal capacity how many Amps hours the battery can deliver according to specifications differs greatly from the effective capacity how many Amps the battery can actually deliver during use.
We explain how this works in our article discharge and battery capacity. I have a 12 volt battery of 70 ah. Another way to measure the capacity of the battery is in Watt-hours Wh. Wh is calculated by multiplying the number of Amps with the battery voltage. So these batteries have the same capacity, only one works on 12 volts and the other on 24 volts. In practice you will notice that these batteries will be around the same dimensions and weight. Example 5: I have a W trolling motor and a battery with a capacity of Wh.
I do not even need to know how the trolling engine or battery voltage to calculate this as long as they work at the same voltage obviously. The attentive reader notes that the runtime of a battery with a device can be calculated in two ways. Either by dividing the number of Amps of the battery by the power draw in A of the trolling motor or by dividing the number of Wh of the battery Wh by the number of W of the trolling engine.
Batteries can be connected together to achieve a higher voltage or higher capacity. This is done by connecting the battery terminals of the batteries with cables. When we say that we connect batteries in series, we connect the plus terminal of one battery to the minus terminal of another battery. This is a very small power station; you would need a bigger one. Hello Ian, cool gig.
These are the kind of calculations you can make but, in practice, the output is nearly impossible to figure out. Hope it helps a bit.
Save my name, email, and website in this browser for the next time I comment. Insert Watt Hours Wh :. Insert Volts V :. With 8. Thanks Reply. Thanks Andy Reply. All in all, the system can handle the new freezer. Trish Reply. Convert w to Ah Reply. How many batterys do I need to run w for 5 hours What size battery How many amp And for w Reply.
So interesting Am very grateful for your explanation Reply.
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