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Exam 8: Inverters

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Question 1

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Inverters designed for installation in North America will have a(n) ____________________ Hz output frequency.

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Question 2

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The inverter type that is connected to, and works in parallel with, the electric utility grid is the ____________________.

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Question 3

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List the three common waveforms that inverters produce.

A bimodal inverter is an inverter type that can operate as either a grid-tie or stand-alone inverter.

Why should inverters be required to have low harmonic distortion?

Inverter efficiency has improved over the years and now many grid-tie inverters are rated up to 95% efficient.

The ____________________ inverter type is connected to the PV system batteries and operates independently of the PV array and the utility grid.

When are batteries needed to store electricity produced by PV modules?

Micro-inverters are only used in ____________________ PV systems.

What is the function of a micro-inverter?

Inverters that have both capabilities built in (stand-alone and grid-tie) for future utility connection are referred to as ____________________ inverters.

A converter is a device that converts direct current (DC) electricity into alternating current (AC) electricity.

Stand-alone inverters are connected to the batteries in a stand-alone PV system.

If a PV system is utility interconnected but also has battery back-up to power loads when the grid is down a(n) ____________________ inverter needs to be specified.

A true sine wave inverter is suitable for sensitive electronic equipment because it produces an output with very little distortion.

____________________ operation of inverters allows more loads to be served because the current ratings of the inverters add up.

What are typical functions offered by a Power Conditioning Unit (PCU)?

A(n) ____________________ inverter is suitable for operating a wide variety of loads, including motors, lights, TVs, and other electronic equipment.

Equipment that can perform electrical power processing and control functions as well as performing as an inverter is called a power ____________________ unit.

What needs to be considered when specifying a stand-alone inverter?