What is Inverter part 3@ String & Micro Inverters (Review)

In previous Lesson we have learned about On -grid and Off- grid Inverters, http://edyeazul.blogspot.com/2017/01/what-is-inverter-part-2-on-grid-inverter.html...

String or Central Inverter as well as Micro Inverters both can be used in off grid or on grid solar system...So where is the difference.This category is based on how it is working with the solar panel...This time the differences are in the working principle of Inverters...Lets get started..

Micro Inverters : The main differences which micro inverters show is that it always work with the solar panel individually , it directly convert the DC power of the solar panel AC power on individual solar panels.

The connection is like the Picture is given,  

Micro Inverter connection

 

Roof top Micro Inverters

Benefits : 

• Micro Inverters shows superior performance in shading problem , if one or two solar panels get shaded only that particular solar panels will stop working but it will not affect the others. 
• This kind of Solar Inverters are design to get maiximum power out from the individual solar panels..
•  No DC combiner needed for huge installation as though it is converting the power from DC to AC at the beginning.
•  In big solar power plant the DC voltage is high which is very dangerous and Micro Inverters reduces that problem..
• It is easy to install Micro Inverters because they are light in weight.
• Micro Inverters are more efficient then other Inverters because they drive out maximum  power from individual solar panels....
• It shows longer warranty and service time..

Shortcomings : 

• This is the most costly system available than any other Inverters system..
• Installation takes more time than others.. 

Manufacturer : Enphase, Solaredge etc..

String Inverters :  The name of this inverter defining that it works with multiple array of solar panels, it works with combined DC power sources and convert it to AC grid power system..The picture given below demonstrating the string Inverters connection :

String Inverter Array Connection

String Inverters outside

 Benefits : 

• String Inverters are the least cost inverters for on grid system
• This Installation takes less time and effort...
• Efficiency is  good but less than micro inverters ..
• This system can handle huge solar array alone and can handle huge DC voltage..

Shortcomings: 

• Need more money to install DC combiners 
• High Risk system for High DC voltage ...
• Installation is harder because its weight.
• It shows lower warranty and service time.
• It cannot handle shading problem like micro inverters.

Manufacturer : SMA, Aurora etc...

hope you like the post   (Jajakallahu khairan)