To calculate the generator size required per kilowatt-hour (kWh), you need to consider two key factors: the power (in kilowatts) of the electrical load you want to supply and the duration (in hours) for which you want to provide that power.
Here's a step-by-step process to calculate the generator size:
Determine the power requirements: Determine the total power (in kilowatts) of the electrical load you wish to supply. This can be done by summing up the power ratings of all the appliances or devices you plan to connect to the generator. Make sure to convert any units that are not in kilowatts to kilowatts.
Determine the desired duration: Estimate or determine the duration (in hours) for which you want the generator to provide power. This could be the total runtime you expect, or the duration between refueling the generator.
Calculate the energy requirement: Multiply the power requirement (in kilowatts) by the desired duration (in hours) to obtain the total energy requirement (in kilowatt-hours). This represents the amount of electrical energy that needs to be generated by the generator to meet your needs.
Energy (in kWh) = Power (in kW) x Duration (in hours)
Generator sizing: Based on the total energy requirement, you can select a generator with a capacity equal to or slightly larger than the calculated value. It's recommended to choose a generator size that provides some margin above the estimated energy requirement to accommodate any variations or future needs.
Remember that the generator size you calculate should be able to meet the peak power demand of your electrical load. Additionally, factors like the efficiency of the generator, power factor considerations, and any specific requirements of the appliances or devices being powered should also be taken into account.
It's worth noting that consulting with a professional electrician or generator supplier can provide more accurate guidance and help ensure that you select the appropriate generator size for your specific needs.