When the solar panels absorb the lights and transfer the energy to the PV cell, there is a DC current, then the energy created and stored in a battery bank, then you need a solar inverter to run your appliances.

For regular consumer use, and alternating current (AC) is needed – 220volt or 110 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.

Pure sine wave inverters:

The DC electricity produced in the PV cells does not have a wave form, but is rather a direct line. 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 Hz – 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 pure 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 pure sine waves.

Another kind is 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 pure sine wave.

Note that the effectiveness of modified sine wave inverters (also known as quasi-sine wave inverters and modified square wave inverters) can vary between different inverters and can vary depending on the load. The least effective modified sine wave inverters are only useful for very basic appliances like toasters and appliances that use only a heating element.

Then how to choose a suitable solar inverter?

If the specification is 12-volt battery 50 Ah, we multiplied by 50 Ah 12 volt, battery power output reached 600 watts. If the solar inverter efficiency is 90%, we then multiplied by 90% of 600 watts, 540 watts draw. This means that you can move a piece of the battery output power up to 540 watts of solar inverter. Of course, you can take “one step”type of procurement approach

No matter that the first use his car battery current specifications, and buy a power output of 800 watts of solar inverter. Then, the first battery in this moment the extent permitted use, so in the future for a greater use of the car and then full power.

100 watts is enough, then you can buy a low-power solar inverters. In addition, in determining when the solar power inverter, there is an important principle, namely, the use of solar power inverter, do not run full term, otherwise it will shorten the life of solar inverter, solar inverter failure while Rate will significantly rise. We strongly recommend that users, preferably not more than 85% of rated power using solar energy inverter state.

Finally, how to test solar inverter?

Overload Protection: 150W power inverter solar, open the switch, connected to a load greater than the 160W-180W, solar inverter output will be interrupted refuse 220V power supply, the red light flashes. The scope of protection 300W 300W-350W 500W 500W-550W scope of protection

Low-voltage protection: in the solar system can work for some time, the battery’s power gradually reduced to 10.5V when the solar inverter alarm, sensitive electrical appliances (such as computers), please stop using it. Ignore the alarm voltage down to 9.7V-10.3V solar inverters automatically shut down,Overvoltage Protection: Charging system failure, battery voltage rises to 15.5V or more solar inverter stop working.Short circuit protection: solar inverter work, 220V output short circuit, the red light flashing, and remove.Over temperature protection: in the solar inverter full load after a period of continuous work, the shell body temperature reaches 55-65 degrees and cut off the power when the alarm.

Thus, If using solar inverter rated power than a refrigerator, air conditioning to start the solar inverter, can be automatically protected if protection is a real good product.