NewsHome > News > Industry News >

How Solar Inverters Work,do you know?

Time:2013-10-10 11:18Click:
A solar inverter is a piece of the solar energy puzzle. Its purpose is to change the direct current (DC) electricity that is generated from a photovoltaic panel into an alternating current (AC) that can be used by in-home appliances and the
A solar inverter is a piece of the solar energy puzzle. Its purpose is to change the direct current (DC) electricity that is generated from a photovoltaic panel into an alternating current (AC) that can be used by in-home appliances and the community electricity grid. Because all photovoltaic panels produce electricity in DC, an inverter is required for all solar power systems to make the electricity usable in home settings. Inverters are not necessary for solar applications such as RVs and boats since vehicles are wired for the same DC power panels produce.
 
The solar inverter may seem insignificant, but it is most often the choke point of a photovoltaic installation. Many people fall into the trap of underestimating the system's needs for a solar inverter and purchase one that handles a smaller capacity than necessary in an attempt to save money. This is a mistake that can be costly in the long run. A better way to cut costs is to purchase an inverter with much more capacity than you plan to initially install and add more panels to boost production later on down the line. This leaves your system with room to grow.
 
Do you know how Solar Inverters Work?
 
To explain how solar inverters work, we must start from the basics. The sun shines down onto photovoltaic (PV) cells. These cells are made of semiconductor layers of crystalline silicon or gallium arsenide, and they are arranged into panels.
 
The semiconductor layers are a combination of both positive and negative layers, and they are connected through a junction.
 
Basically, as the sun shines down, the semiconductor material absorbs the light, transferring the light’s energy to the PV cell. This energy knocks electrons loose, and they move from one layer to the other, thereby producing an electric current. This is a direct current (DC). The energy created is then generally either stored in a battery bank for later use or sent directly to an inverter, depending on the set up and type of system.
 
For regular consumer use, and alternating current (AC) is needed – 120 volt AC powered home appliances require AC electricity. This is where an inverter comes in. The inverter takes the direct current and, in simplified terms, runs it through a transformer. It is almost as though the inverter is tricking the transformer into thinking it is getting AC by forcing the DC to act in a way similar to AC – the inverter runs the DC through two or more transistors that are rapidly turned on and off and feeding two different sides of the transformer.
 
Sine Waves
 
The DC electricity produced in the PV cells does not have a wave form, but is rather a direct line (hence its name, direct current.) Basically, to become AC, it must become a sine wave (on an x-y graph, the sine wave rises from 0 to a positive point, then back down through zero to a negative point and back up to 0. This known as one cycle or a hertz – a regular sine wave has 60 hertz per second [the sine wave continues to repeat itself 60 cycles per second.])
 
The alternating current used by a city electric grid is a true sine wave. It runs smoothly up and down in an arced, wave-like motion. Of course, an inverter that produces a pure sine wave often costs more than other inverters – only higher quality solar inverters produce true sine waves.
 
A modified sine wave, on the other hand, rises up to the positive point and down to the negative point in steps – it looks like a stepped square wave. While many appliances will run on this type of sine wave, they may not run as well (e.g. while computers and TV’s will run, certain bread makers, microwaves, washer and dryers, etc. may have problems with the modified sine wave.) Also, items with motors will end up using more power when using a modified sine wave versus a true sine wave.
------Separator----------------------------
News

FREE SITE SURVEY

need a power Protection systerm? Request our free survey now

Learn more >

FREE HEALTH CHECK

Not sure you have the correct UPS setup request a check now

Learn more >

CASE STUDIES

Read about our recent projects and satisfied clients.

Learn more >

APPLICATION

UPS Apply to Data-Center, Telecom,IT,Industry, Network,Office,Home.

Learn more >

DOWNLOADS

Products Specifications & more

Learn more >

CONTACT US

For more information about our products & services

Learn more >