And when we do, we see how wrong we were: However, when we calculate each battery's capacity in watt hours, we find that Battery A actually has a greater capacity than Battery B. Once we do, we can make an apples to apples comparison of the amount of energy they can provide. We need to take voltage into account for both batteries, and we do that by calculating their watt hours. If you only looked at amp hours, you'd assume Battery B can provide a lot more energy.Īfter all, 33Ah is much greater than 12.8Ah.īut these batteries have different voltages, so only comparing their amp hours is like comparing apples to oranges. If you were to only compare their amp hours, you'd assume Battery B has a greater capacity.īattery A is a 36V 12.8Ah ebike battery, while Battery B is a 12V 33Ah lead acid battery. The total energy a battery can provide depends on both its amp hours and voltage, so only comparing amp hours can lead you to some erroneous conclusions.įor example, consider these two batteries of mine, which I'll call Battery A and Battery B: Battery A (left) is a 36V 12.8Ah ebike battery, while Battery B is a 12V 33Ah lead acid battery. In this example, your battery has a capacity of 600 watt hours.Įasy! Why Convert Amp Hours to Watt Hours?Ĭonverting amp hours to watt hours makes it easier to compare how much energy different batteries can deliver. To calculate your battery's watt hours, you'd multiply its amp hours by its voltage: 50 Ah × 12 V = 600 Wh Let's say you have a 12V battery with a 50Ah capacity. To convert amp hours to watt hours, simply multiply amp hours by volts. How to Convert Amp Hours to Watt Hours (Ah to Wh) Amp Hours to Watt Hours at 12V Amp Hours (Ah)Īmp Hours to Watt Hours at 24V Amp Hours (Ah)Īmp Hours to Watt Hours at 36V Amp Hours (Ah)Īmp Hours to Watt Hours at 48V Amp Hours (Ah) Here's are some tables converting amp hours to watt hours at common DC voltages. Question: 600W are being sent at 120V.Or would you rather convert watt hours to amp hours? Amp Hours to Watt Hours Conversion Charts ![]() Let's go through some examples to help nail the conversion process. Advertisements Watts to amps conversion examples Power supplied to homes and businesses uses AC supply. In Europe, the UK, East Japan and most of Australia, South America, Africa andĪsia, the current changes direction 50 times per second, which is 50Hz. In Northern America and Western Japan, this usually happens 60 times per second, or 60Hz / hertz. A flashlight with a battery uses a direct current.ĪC stands for alternating current, when the current periodically changes direction. North American homes typically use 120V for their electrical supply, whilst 230V is common acrossĭC stands for direct current, when the current flows in one single direction. ![]() In the hose analogy, the volts would be the water pressure. They measure the force required to make the electrical current (amps) flow. It uses increased water volume and higher water pressure the same applies to the wattage if amps and volts are increased. A water wheel would turn faster and longer, generating more energy if Multiplying amps (water volume) by volts (water pressure) gives you the wattage (the resulting power or energy). Watts represent the amount of energy produced by the amps and volts working together. ![]() In this analogy, the quantity (volume) of water would be the amps. It can be helpful to imagine electrical current as water in a hose. What are amps?Īmps are amperes, a unit which measures electrical current. To help understand the conversion of watts to amps, let's go through what each of these units represent. Advertisements Understanding watts, amps and volts
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