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. Or would you rather convert watt hours to amp hours? Amp Hours to Watt Hours Conversion Charts
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