kWh to Ah | kiloWatt hour to Amps-hour calculator

kWh to Ah Calculator

below is the calculator for converting kWh to Ah, for this third parameter you need is battery voltage.

How to use kilowatt hour calculator

  1. Enter the value in the kWh block which corresponds to kilowatt hour value of the battery
  2. Enter the battery voltage in the next block
  3. Result is the Ah or Amps-hour of the battery.
  4. Note kilo in watt hour in the calculator 1000 is multiplied to remove the effect of kilo.





Formula for finding Ah used in the calculator

Ah = kWh*1000 / Voltage

12V x 20 A = 240W

12V battery, 80AH capacity = 960Wh

What it Ampere Hours (Ah) ?

Most of you must have seen or used a battery once in your life. Ever wondered what does the ‘mA-h’ symbol indicates? Well, it is always a smart recommendation that before entering into the complex electronics, understand the basics you encounter in your daily life.


Ampere is a measure for the amount of current flow in an electrical conducting device. In other words, the unit assigned to measure o the amount of electric current flow is called Ampere. Ampere is defined as the amount of electron flow when electric charges flow through the conductors.

The formula for Ampere is,

1 Ampere= 1 Coulomb/ 1 second

Ampere Hours (Ah)

The Ah or A-h is an acronym for ‘Ampere Hours’ used in electrochemical systems. It is the unit used to measure the number of energy charges that can be stored in a battery or conductor. The unit of the system used is the Non-SI metric system.

Mathematically represented as,

1 hour = 60 minutes

1 minute= 60 seconds

1 hour= 3600 seconds

1 Ah= 1 C/s x 3600 s

1 Ah= 3600 c

How to convert Kilowatt-Hours to Amp-Hours ?

The kilowatt hour, the allocated kWh or kWh hour, is a measure of electrical energy. One kWh of energy is equal to one kilowatt, or one thousand watts, which is used for one hour. Amp-hours, abbreviated Ah or Ah, is a measure of electrical charge, and is often used to measure the charge of batteries. An ah will provide an amp current for one hour.

Kilowatt -hours (kWh) are used to measure electrical energy measured in kilowatt or watts for one hour. These ratings are normally used on Lithium based batteries because their Amps per hour (Ah) rating is typically provided at 1C charge/discharge rate. I.e a 200Ah lithium-ion battery will provide 200A for 1hour.

Ah and kWh ratings

When deciding on batteries you need to clearly understand the difference between these two measurements to ensure that you are comparing apples with apples before you make your selection.

The best is to convert Amp Hours to kilowatt-hours (kWh) and then compare the results. This is done by using the following formula: Kilowatt-hours (kWh) = Amp-hours (Ah) × Voltage of battery (V) ÷ 1,000.

For example, let us convert 200 Ah at 12 V to kWh.

(200 Ah x 12V) ÷ 1000 = 2.4 kWh or 2400 watts of energy can be consumed in one hour.

Lithium batteries ratings are stated in kWh so if you use as example one of our 6.13 kWh Lithium battery packs, it means that you have 6130 watts of energy that can be consumed in one hour.

Remember this relation

Volts(V) X Current(I) = Power(Watts), i.e 12V x 200A = 2400W [An instantaneous power rating]

Volts(V) x Ampere-hour(Ah) = Energy (Wh) i.e 12V x 200Ah = 2400Wh [A energy capacity/utilization rating]

So a 12 volt system with a single Hup 17 would be 845 AH x 12 V / 1000 = 10.1 Kwh A 48 v system with the same amp hours would have four Hup 17s. the batteries would add in series 12v + 12v+12v+12v= 48v So even though the amp hours are the same as the first example, the voltage is higher. 845 AH x 48V / 1000 = 40.6 Kwh. Which is 4 times as much energy as the 12 v system.

to calculate kwh from Ah use this calculator Ah to kWh Calculator