Recently, We recieved many inquiry from different clients. Most of them are professional. However, some customers will made some mistake about kwh, kw, and ah. Sometimes, people get confused or type it in a lazy way. But this could lead to a wrong way on communication. Here We would like to share about them as following:
How to Convert Amp-Hours to Kilowatt-Hours
Amp-hours, often expressed as Ah or A·h, are a measure of electrical charge. Amp-hours are often used to measure the charge of a battery, for example. A charge of one Ah will supply one amp of current for one hour.
Kilowatt-hours, expressed kWh or kW·h, are used to measure electrical energy. One kWh is equal to one kilowatt, or one thousand watts, of energy consumed for one hour of time.
To convert from electrical charge to energy, use the formula below along with the voltage.
Ah to kWh Conversion Formula
kWh = Ah × V1,000
The electrical energy in kilowatt-hours is equal to the charge in amp-hours times the voltage, then divided by 1,000.
formula to convert amp-hours to kilowatt-hours
For example, let’s convert 100 Ah at 48V to kWh.
kWh = (100Ah × 48 V) ÷ 1,000
kWh = 4,800 ÷ 1,000
kWh = 4.8 kWh
How do kW and kWh relate to batteries?
When buying batteries, you need to think about both the power of the battery and the energy storage capacity of the battery you are looking at.
The battery’s energy storage capacity is measured in kWh—for example, the ‘Powerwall 2’ stores 13.5 kWh of energy.
Its power is 5 kW, so it can charge or discharge at that rate. At full power, then, it can fully discharge in under 3 hours.
The more energy (kWh) a battery has, the more you can store and the longer it will last, the more power it has the faster you can get that energy in or out of the battery,
In other words, the more power it has, the more appliances you can power with it and the more energy it has, the longer you can power those appliances.
For normal household use, you want enough energy to get you through the night and at least 5 kW of power for speedy charging.