If you’re not sure your battery’s amp hours, but you know the watt-hours are 120, and the voltage is 12, you can calculate the amp hours: 100Wh / 12V = 10Ah. On the flip side, if you need to discover how many amp-hours (Ah) of current your electrical system can handle, use the following equation: amp-hours = watt-hours / voltage. How Do You Convert Amp Hours from Watt Hours? To showcase how amp-hours does not equal energy, you could get the same 1200 watt-hours from a 24V battery. → Need a quick refresher? Check out Amps, Volts, and Watts: Differences ExplainedĪs an example, if you have a 12V battery for your RV, and your device is rated for 100Ah, you’ll need to multiply the amp hours by the volts: 100Ah x 12V = 1200Wh. In this instance, if you don’t know the number of watts, you’ll multiply the total number of amp-hours times the voltage. The equation is watt-hours = amp-hours x volts. This will assist you in deciding on the voltage you will use, battery sizes, and even the thickness of wires for your solar system design, etc. ![]() When measuring your RV electrical system requirements, you’ll need to convert watt-hours to amp hours. How Do You Convert Amp Hours to Watt Hours? However, if you only use that 100Ah battery for half an hour, it can give 200A during that 30-minute draw (if the battery operates at 100% efficiency). If you have an 100Ah battery, this means it can expend 100 amps of energy in one hour. Because voltage is not included in an amp-hour, you cannot calculate energy from amp-hours alone. It’s expressed with the abbreviation “Ah.” Amp-hours is not a measurement of energy, but rather a measurement of charge. This measurement tells you the number of amps a device draws when you use it for an hour. What is an Amp-Hour?Īn amp-hour is a measurement of current (in amps) flowing over a period (an hour). Or, to use the abbreviated measurement, the answer would be 1440Wh. So, if you have a 60W bulb and you’re trying to calculate how many watts your bulb uses in 24 hours, your equation would read 60 watts x 24 hours = 1440 watt-hours. Here’s the equation: (total number of watts) x (total number of hours) = watt-hours. Conversely, if you have five 100W devices running for one hour, they would use 500Wh in total. So, if an appliance is rated at 100W, it will use 100W of power in one hour and 200Wh in two hours. ![]() When talking about battery life, this would mean the number of watts that an application uses per hour.
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