Inverter Basics

By Dave Rongey Summary: The electrical power Inverter is used to convert one source of electrical power to another and is the vital link between solar panels or wind generators and the utility power distribution system known as the grid.

The Function of an Inverter for Electrical Power Generation

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Optimal Efficiency
Inverters are now available with a real efficiency of up to 97.1%. The system efficiency is crucial for maximum power output and accomplished when selecting high quality system components.

Surge Voltage Protection
Inverters should be equipped with thermally monitored varistors on the DC side and is indicated with a LED and have the ability to be supervised with a remote monitoring system.

Reliability
Highest reliability and a lifetime of over 20 years are major aspects taken into account during the design of a quality inverter. The newer inverters should come with a 10 year warranty.

Things to consider when selecting an Inverter

Simplest Installation
DC distribution cases and connection boxes are no longer necessary resulting in reduced installation costs.

Connect It Anywhere
The inverter can be connected to any available part of the AC distribution system of the house, and in some cases in an attic or a similar room, depending upon your application and system requirement.

Mount It Anywhere
The cases should be NEMA 3R rated, weather resistant and a wide temperature range tolerance enabling the inverter to be mounted nearly anywhere. The inverter should be capable of installation directly on PV modules, on the roof or on the wall of your house. A world-wide usage of the inverter is therefore possible.

Diagnosis And Communication
Communicate with your inverter is important. Measurement values and messages should be capable of being transmitted to a PC via wireless or RS485 cable where you can be continuously informed about the situation of your alternative power plant with the option to view statistics of your solar system on the Internet.