Akin to miles per gallon (mpg) for fuel-burning vehicles, this metric represents electric vehicles'' energy consumption in kilowatt-hours per hundred miles (kWh/100 miles). A battery stores...
Electric Car Battery Life: Everything You Need to Know, Including How Long They Last. The battery packs of electric vehicles are quite resilient, with the lithium-ion type used in most...
Opel Combo-e Life 50 kWh: 213: Peugeot e-Rifter M 50 kWh: 213: Toyota Proace City Verso Electric L1 50 kWh: 213: Mercedes-Benz EQE SUV AMG 43 4MATIC Nissan Ariya e-4ORCE 87kWh - 290 kW: 215: Mercedes-Benz EQE SUV AMG 53 4MATIC+ 216: VinFast VF 8 Eco Extended Range: 217: BMW iX M60: 217: Citroen e-Berlingo XL 50 kWh: 217: Opel Combo-e Life
An EV''s battery capacity is like the size of its fuel tank. While we measure a fuel tank in gallons, we measure battery capacity in kilowatt hours (kWh). We already explained that a watt-hour is a measurement of energy, so a kilowatt-hour is simply 1,000 of those watt-hours.
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In our article discussing Ah (ampere-hours) and Wh (watt-hours), we got a ton of questions about the longevity of batteries. The question “How long does a battery last?” was a predominant one. To help everybody trying to calculate how long will a battery last, we have created a Battery Life Calculator.
It’s quite useful knowing when a battery will die on us. Example: If we go camping and depend on batteries for all our power needs, and we have no other means of generating electricity.
Before we check out the Battery Life Calculator, let’s note that figuring out how long will a battery last is pretty simple in theory (in practice, it’s actually quite difficult). We use this equation for battery drain time:
Example: How long will a 100 Ah (amp-hour) battery last if we hook it up to a 1 Ah electric device? Well, battery capacity = 100 Ah, load current = 1 A, thus such a battery will last for 100 Ah / 1 A = 100 hours.
Basically, a 100 Ah battery means that such a battery can provide 100 A of current for 1 hour. It can also provide 1 A current for 100 hours. Or 0.1 A or 100 mA for 1000 hours.
“I have a 100 Ah battery and want to run a camping light with a load current of 1 Ah with it. How long before the battery runs out?”
Most of us deal with watts (W). We don’t know what the load current of a 100 W light is. We just know that it’s a 100 W light, right. That’s why most questions about how long batteries last go along these lines:
“I have a 100 Ah battery and want to run a 100 W camping light with it. How long before the battery runs out?”
We want everybody to be able to determine how long will their battery life last. That’s why we feature 3 key sections that will help you out to do just that:
Let’s start with the basics: How to get from watts to amps?
Imagine a simple enough scenario. You have a big 200 Ah lithium battery and want to run a small 800 W portable air conditioner with it. How long can you run such an AC before the battery dies out?
Well, we already know that we need 2 numbers:
To calculate amp draw (A) from watts (W), we also need to know the voltage (V). To calculate amps, we use the basic electric power equation:
Basically, electric power P (wattage) is calculated by multiplying electric current I (amps) with voltage V (volts). To calculate amps, you have to express the electric current I (amps) like this:
Example: We have an 800 W AC unit that runs on a 120 V electric circuit. What’s the amp draw here? Easy, we just divide 800 W by 120 V and get 800W/120V = 6.67 A.
If you find this confusing a bit, you can use our watts to amps calculator here to help you out with the calculation.
In our example above, we have calculated the amp draw of the 800 W AC. It’s 6.67 A. Now we have both numbers; we have a 200 Ah battery and we know the AC has a 6.67 A draw. How long will a 200 Ah battery last if it has to power this AC? Let’s calculate:
In short, a 200 Ah battery will be able to power an 800 W 120 V air conditioner for about 30 hours.
Now, it’s important that we feel the effect of different voltages. Let’s say that we have the same 200 Ah battery, the same power input 800 W unit, but it runs on a 240 V electrical circuit instead of a 120 V circuit.
Because the voltage is different, the amp draw – the amps required to run such an AC – will also change. Let’s calculate the new amp draw using the basic power equation:
As we can see, the amp draw is no longer 6.67 A; it’s 3.33 A. When we increase voltage, we need fewer amps to get the same electrical power (wattage). Based on this, we can now calculate how long will a 200 Ah battery be able to power an 800 W 240 V air conditioner:
As we can see, because the amp draw is halved, the battery life is increased. That’s because an 800 W air conditioner on 240V requires fewer amps than an air conditioner on 120V.
Now we know how to calculate the amps from watts. We can use this knowledge to calculate the second vital input into the Battery Life Calculator:
When you figured out how big a battery you have (battery capacity in Ah), and how many amps does a device you want to hook on the battery runs on, you can input both numbers in this calculator. As a result, you will get how long will a battery last (in hours):
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