Exam (elaborations)
Chapter 4 System Components Questions and Answers
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Chapter 4 System Components
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Chapter 4 System ComponentsWhy is energy storage needed in most stand-alone PV systems? - answerBecause the
output of most power generation technologies are either steady or limited, and there is
always a higher demand for energy at certain times of the day, an energy storage in
most stand-alone PV systems stores all the excess energy to be used in peak demand
time. This means that production and demand of energy are balanced through energy
storage systems.
Besides energy storage, what advantages do battery systems provide? - answerThe
benefits of a battery system depends on its size, cost, and performance. By converting
electrical energy into chemical energy while charging and discharging simultaneously,
you now have a battery system. Because PV modules has current-limited power
sources to start up, batteries provide that short surge of current needed for loads with
special starting requirements. By establishing a stable system operating voltage at
which the array and loads both operate, batteries allows the array to operate at
maximum power, electrical loads or inverters to work at its rated voltages, avoid
damages from high voltages and under perform with low voltages.
What is the difference between an inverter and a power conditioning unit? - answerA
power conditioning equipment includes more than one power conditioning function,
whereas an inverter only has one function. An inverter converts DC power to AC power.
A power conditioning unit converts, controls, or processes DC power produced by a PV
array to make the power compatible with other equipment or loads.
A power conditioning equipment includes more than one power conditioning function,
whereas an inverter only has one function. An inverter converts DC power to AC power.
A power conditioning unit converts, controls, or processes DC power produced by a PV
array to make the power compatible with other equipment or loads. - answerA charge
controller is a device that regulates battery charge by controlling the charging voltage
and current from a DC power source, such as a PV array. Charge controllers protect the
battery bank from overcharge and over discharge, improving system performance and
prolonging battery life. A charger is a device that combines a rectifier with filters,
transformers, and other components to condition DC power for the purpose of battery
charging. In PV systems, inverters convert DC power from battery banks or PV arrays to
AC power for AC loads or export to the utility grid.
This question is important for both Grid Tied and Stand Alone systems and this feature
is found in grid tied inverters and charge controllers How does a maximum power point
tracker maximize array output? - answerA maximum power point tracker is a a device or
circuit that uses electronics to constantly adjust the load on a PV device under changing
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