In this formula, P is power, measured in watts , I is the current , measured in amperes , and V is the potential difference or voltage drop across the component, measured in volts. Knowing how much current is flowing to your load is very important in selecting the correct wire.
We take the distance into consideration to calculate the voltage loss. The other half of this calculation is the current.
You need a larger wire to move more current. If you have a choice the higher voltage is best. These formulas are also useful in calculating AC alternating current wattage to determine the size of an inverter, which converts the DC electricity from a solar array to AC that can then be used to power lights and appliances in homes and businesses. Appliances include a face plate which contains all of its electrical data.
Lets suppose you have a microwave oven. The manufacturer will list an amp requirement on the electrical data of the face plate, which is usually attached to the back of the oven.
The engine still runs on 12V but now pulls 25A. 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. Can I add another Watts? Hello Serge, the voltage is V? Additional W would add the total to W and My understanding is that I would need to run amp circuits to carry this load is that correct?
Also, can you calculate the cost of electricity used in a 24hr time period. Hello Max, nice rig. You have Your understanding is correct; you will need 3 20 amp circuits. You can use our power consumption calculator here for all these calculations. Each hour, you consume Hope you can help me understand it. And now I have a device which needs W DC power. An AC-DC power adapter has been provided and it has the following.
The true measure of capacity is Wh or Watt-hours. You can use this Ah to Wh calculator to figure out how many Wh you have.
Alright, so you have a 16,Wh battery. Want to hook it up to V to run an AC? Want to know how long will this battery run an air conditioner? The AC you have has a 5. Hope this makes sense. Save my name, email, and website in this browser for the next time I comment.
Table of Contents. Input Watts W. Input Volts V. Thanks Reply. Wanting to install a wind turbine watts at 12volts output how many amps at vo. Hello Charlie, W at 12V you have Thanks ruben Reply. Hello, I have a question. However, has the potential to cause overloads if daisy chained How do you convert watts and amps?
Share this article:. Typically, W the faster the charger the higher the power. Typically, W. Double controller types are generally higher powered.
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