How do I convert kilowatt-hours to amp-hours?
In many cases, we need to convert kWh to Ah. With smaller 12V batteries, we also need to convert kWh to mAh.
We will look into how does kWh to amp-hours (Ah) conversion. You will also find a kWh to Ah calculator that dynamically calculated kWh from Ah and a calculated table of kWh to Ah and kWh to mAh. Let’s start with an example to illustrate.
Example: How to convert 13.5 kWh to Ah? First, we need to specify the voltage. Let’s say we have a 12V battery. We can calculate Ah from kWh using the basic kilowatt-hour equation:
kWh = Ah × V × 1,000
We express amp-hours (Ah) and insert our numbers:
Ah = kWh ÷ V × 1,000
Ah = 13.5kWh ÷ 12V × 1,000 = 1,125 Ah
That means that 13.5 kWh is equal to 1,125 Ah or 1,125,000 mAh on a 12V circuit.
Here is the kWh to Ah calculator that makes this calculation automatically:
kWh To Ah Calculator
Just insert kWh and voltage (V), and you will get the calculated Ah. You can also play around with numbers a bit and the calculator will dynamically calculate the ampere-hours:
For example, it is useful to know this basic conversion:
1 kWh to Ah in a 12V battery is equal to 83.33 Ah.
On the other hand, if you need an Ah to kWh conversion, you can find a similar Ah to kWh conversion calculator here.
Here is the full calculated table of kWh to Ah conversions for the 12V circuit:
kWh To Ah And kWh to mAh Chart (At 12V; For Batteries)
| kWh (kilowatt-hours) | Ah (amp-hours) | mAh (milliamp-hours) |
| 0.01 kWh | 0.83 Ah | 830 mAh |
| 0.02 kWh | 1.67 Ah | 1,670 mAh |
| 0.025 kWh | 2.5 Ah | 2,500 mAh |
| 0.05 kWh | 4.17 Ah | 4,170 mAh |
| 0.1 kWh | 8.33 Ah | 8,330 mAh |
| 0.5 kWh | 41.67 Ah | 41,670 mAh |
| 1 kWh | 83.33 Ah | 83,330 mAh |
| 2 kWh | 166.67 Ah | 166,670 mAh |
| 10 kWh | 833.33 Ah | 833,330 mAh |
| 20 kWh | 1,666.67 Ah | N/A |
| 50 kWh | 4,166.67 Ah | N/A |
| 100 kWh | 8,333.33 Ah | N/A |
If you have any questions about how to convert these two electrical units, you can pose a question in the comments and we’ll help you out.
I am trying to determine how many Ah 12V battery I will need to power my 115VAC refrigerator for 48 hours.
I used a watt meter and found that my frig uses 1.04 kWh in 48 hours.
If I use an inverter that is 90% efficient I am coming up with approximately 91Ah of 12V battery. Does that seem correct?
Hello Brent, if your fridge uses 1.04 Wh in 48 hours, you basically need a battery that can produce 1.04 kWh of output. That would be 1040 Wh/12V = 86.7Ah battery (at 100% battery efficiency). Of course, you also have to account for 90% efficiency.
That 1.04 kWh should represent 90% of the battery capacity. Here is how you account for that: 86.7 Ah / 0.9 = 96.3Ah. So, you would need at least a 96.3Ah 12V battery. That’s practically your standard 100Ah battery. Hope this helps.
Hi,
I power 2 led lights of 72watts @ 220v. If a run these on battery setup of 24V with inverter how much will a 100Ah battery last…?
Hello there, so 2 LED lights with 72W each required a total of 144W power. A 12V 100Ah has a capacity of 1,200Wh and will run both of them for 1,200Wh/72W = 16.7 hours. If you have a 24V 100Ah battery, it will have double the capacity (2,400Wh) and will run the lights for double the time (33.3 hours). Hope this helps.
Hello I have a solar system 8 panels; inverter and 4 battery (200A each) for night
Can I keep the fridge (730kwh/year) all night in power without damaging the battery
Thanks for your help
Hello Lila, of course you can, that’s the whole point of having solar panels and batteries set up.