# Chapter 9 â€” System Sizing PowerPoint ® Presentation Chapter 9 System Sizing Sizing Methodologies Sizing Utility- Interactive Systems Sizing Stand-Alone

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• Chapter 9 System Sizing
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• PowerPoint Presentation Chapter 9 System Sizing Sizing Methodologies Sizing Utility- Interactive Systems Sizing Stand-Alone Systems Sizing Multimode Systems Sizing Hybrid Systems Sizing Calculations Load Analysis Critical Design Analysis DC-System Voltage System Availability Battery-Bank Sizing Array Sizing
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• Chapter 9 System Sizing Sizing strategy for stand-alone systems starts at the load side and proceeds backward to the array.
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• Chapter 9 System Sizing Sizing interactive systems begins with calculating the peak array DC power output, which is then derated for various losses and inefficiencies in the system to arrive at a final AC power output.
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• Chapter 9 System Sizing Interactive-system sizing is very flexible because the utility can supply extra energy to the system loads and receive excess energy from the PV system.
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• Chapter 9 System Sizing Stand-alone systems must be carefully matched to load requirements to avoid reducing load availability or producing more energy than is needed.
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• Chapter 9 System Sizing A load analysis tabulates the various kinds of loads and their power and electrical-energy requirements.
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• Chapter 9 System Sizing Load power and energy requirements can be easily measured with inexpensive meters.
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• Chapter 9 System Sizing Load requirements include the power demand and electrical-energy consumption for all the expected loads in the system.
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• Chapter 9 System Sizing The total DC-energy requirement is determined from the requirements for the DC loads (if any) plus the requirements for the AC loads, taking inverter efficiency into account.
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• Chapter 9 System Sizing A critical design analysis compares the load requirements and insolation for each month to determine the critical design month.
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• Chapter 9 System Sizing DC-system voltage is chosen in proportion with the array size and to keep the operating current below 100 A.
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• Chapter 9 System Sizing System autonomy is approximated from the local peak sun hours and desired system availability.
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• Chapter 9 System Sizing Increasing system availability significantly increases the size and cost of the system.
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• Chapter 9 System Sizing The battery-bank sizing worksheet uses information from the load analysis to determine the required size of the battery bank.
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• Chapter 9 System Sizing Due to the allowable depth-of-discharge, low temperatures, and high discharge rates, the amount of useful output in a battery bank is less than the rated capacity.
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• Chapter 9 System Sizing The amount of available capacity from a battery bank depends partly on the operating temperature and discharge rate. These factors may have different effects for different batteries.
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• Chapter 9 System Sizing Battery labels list the rated capacity of the battery and important safety information.
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• Chapter 9 System Sizing Batteries are configured in series and parallel to match the battery-bank rated capacity needed to produce the required output.
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• Chapter 9 System Sizing The array sizing worksheet uses insolation data and load requirements to size the array.
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• Chapter 9 System Sizing Actual array output is often less than rated output due to soiling, shading, and higher operating temperatures.
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• Chapter 9 System Sizing Modules are configured in series and parallel to match the array rated capacity needed to produce the required output.

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