In this example, your car battery has a capacity of 1200 watt hours. To calculate your battery's watt hours, you'd multiply 100Ah × 12V. Let's say you have a 100Ah 12V car battery. To convert amp hours to watt hours, you just multiply amp hours by volts.
#12 volt car battery watt hours how to#
How to Convert Amp Hours to Watt Hours (Ah to Wh) This means our battery's max charge rate is around 83.33 amps, and we can design our solar power system so we don't exceed that limit. This is important to know because many LiFePO4 batteries have a maximum recommended charge rate of 50% of battery capacity in amp hours. The LiFePO4 battery in the example above had a 166.67Ah capacity. Why convert watt hours to amp hours? One reason is because it can help you figure out the max charge rate of your battery, so you can design a solar power system that doesn't go over that limit. After all, things like wire gauge, fuse size, and max charge and discharge rates depend on amperage, not wattage. This is helpful for making an apples to apples comparison of the energy these batteries can deliver.īut, it can be helpful to convert watt hours to amp hours when designing a solar electrical system.
#12 volt car battery watt hours portable#
Some brands have started reporting their batteries' capacities in watt hours - particularly for solar generators (aka portable power stations). For instance, a 12V LiFePO4 battery actually has a voltage of 13.6V when fully charged. Note: Most people use a battery's nominal voltage when calculating amp hours or watt hours, but it's worth reminding you that a battery's actual voltage is slightly different and varies based on its remaining capacity. In this example, your battery has a 166.67Ah capacity. To do so, you'd divide watt hours by volts: 2000Wh ÷ 12V = 166.67Ah You know it's a 12 volt battery, and you want to calculate its amp hours. Let's say you have a 2000Wh LiFePO4 battery.
To convert watt hours to amp hours, simply divide watt hours by volts. How to Convert Watt Hours to Amp Hours (Wh to Ah) Watt Hours to Amp Hours at 48V Watt hours (Wh) Watt Hours to Amp Hours at 36V Watt hours (Wh) Watt Hours to Amp Hours at 24V Watt hours (Wh) Watt Hours to Amp Hours at 12V Watt hours (Wh) Here are conversion charts converting watt hours to amp hours at common DC voltages. Or would you rather convert amp hours to watt hours? Watt Hours to Amp Hours Conversion Charts
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