Basic form of inverter is the square wave but this type of inverter is not recommended because it has poor quality
compare to multi-level inverter and sine inverter . The Multilevel inverter uses low frequency and the sine wave
inverter is formed from high switching frequency. The first is suitable for high power because it is more efficient and
robust, and the latter, is more for medium and low power applicaton.This high frequency inverters is far cheaper. By
considering this, for small-solar power instrument used in this hydroponic system, a 500 W sine wave is installed to
support AC pump work.