Solar Voltaic System Power Rating

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SUMMARY

When sizing a solar photovoltaic (PV) system, it is essential to consider the power factor (PF) of the load, as many suppliers provide power ratings in kilowatts (kW). The solar panels' kW rating should be matched with the load's kilovolt-amperes (kVA) rating to ensure compatibility, particularly because PV generators produce Direct Current (DC) that is converted to Alternating Current (AC) by inverters. The inverter must be capable of handling the reactive load, and the system must include an accumulator that matches the inverter's rating to effectively manage the output, which is dependent on insolation levels.

PREREQUISITES
  • Understanding of solar photovoltaic (PV) systems
  • Knowledge of power factor (PF) and its implications
  • Familiarity with inverter specifications and functionality
  • Basic principles of Direct Current (DC) and Alternating Current (AC) conversion
NEXT STEPS
  • Research how to calculate the power factor for various loads
  • Learn about sizing inverters for solar PV systems
  • Explore the role of accumulators in solar energy systems
  • Investigate the impact of insolation on solar panel output
USEFUL FOR

Solar energy engineers, electrical engineers, and anyone involved in the design and implementation of solar photovoltaic systems will benefit from this discussion.

QwertyXP
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Many suppliers of solar systems give power ratings in terms of kW. However, how should I size the system for loads whose PF is not unity?

I am specifically concerned about the solar panels. Should the panels' kW rating be matched with the load's kVA rating?

Thank you
 
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Photo-voltaic generators produce Direct Current. The attached inverters convert the DC to Alternating Current, one component of which is reactive current.

PV generators output cannot be regulated, being dependent on insolation, so they must supply an accumulator which rating must be matched to the inverters which must be capable of carrying your reactive load.
 
Thanks, Doug Huffman. But how would we size the solar panels?
 

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