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What is the difference between a 12v 400ah vs 24v 200ah battery?

Well, they each contain the same amount of energy, as  12V∗400Ah=24V∗200Ah=4800Wh=4.8kWh .

The voltage of the batteries is different and therefore they’re not simply interchangable, as device are designed to operate off a certain voltage. Applying  24V  to a device designed to operate on  12V  would likely fry that device.

If you’re designing from scratch, the 24V system will be a bit more efficient — all else being equal, since you will have less power loss in the wiring ( P=I2R ) because of the higher voltage, which means you can reduce the current by half ( P=VI , thus if  V  is doubled then  I  is halved for the same amount of power). Concretely, since  I  is halved, the power loss in the wiring will be  4  times lower — or your wiring could be cheaper. In relatively high-power applications, this can be significant.

lifepower4 battery

There are many other factors in deciding whether to opt for  12V  or  24V .  12V  is more common and thus more devices that work off it can be readily obtained. On the other hand, many household devices like shavers, laptops etc. work in the range of  5 – 20VDC , which means that you can simply step down the voltage from a 24V battery to power these devices with a simpler and more efficient — albeit only slightly — buck converter rather than a buck-boost converter to get to the same range from a  12V  battery.

In practice, unless you have a good reason not to, it’s best to stick with a  12V  system simply because it’s so common. It’s good to stick to conventions unless you have a good reason not to.

lithium battery 48v 200ah   24 volt lithium battery 200ah

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