Quick Answer
To size a solar system for high-peak power tools, calculate the maximum power requirement, considering inrush currents and compressor duty cycles, and add a 25% to 50% margin for safety and reliability.
Understanding Inrush Currents and Compressor Duty Cycles
When sizing a solar system for high-peak power tools, it’s essential to consider the inrush current of the motor, which can be 5 to 10 times the rated current. For example, a 2 kW motor may have an inrush current of 20 kW. Additionally, compressors have duty cycles, which range from 20% to 80%, depending on the application. A 10 kW compressor, for instance, may have a duty cycle of 50%, meaning it will only operate at 5 kW for half of the time.
Calculating System Size
To calculate the required system size, start by adding up the maximum power requirements of all the tools, taking into account inrush currents and compressor duty cycles. For example, if you have a 2 kW motor, a 10 kW compressor with a 50% duty cycle, and a 1 kW drill, the total power requirement would be: 2 kW (motor) + 5 kW (compressor) + 1 kW (drill) = 8 kW. Then, add a 25% to 50% margin for safety and reliability, bringing the total to 10 kW to 12 kW.
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