As a solar inverter factory,Mars Solar explain to you how to select best inverter：
1. Dc to ac inverter efficiency
The dc to ac inverter efficiency value is used to characterize the magnitude of its own loss power, usually expressed in %. The dc to ac inverter efficiency in the dc to ac inverter is directly related to the system efficiency. If the efficiency for dc to ac inverter is too low, the off grid solar power system efficiency will be seriously degraded.
2.Auto power inverter rated output capacity.
The rated output capacity is most used to characterize the ability of the inverter to supply power to the negative stage. The highest rated output capacity, the stronger the auto power inverter with load capacity. There are many auto power inverters on the market, and the prices are high or low. Auto power inverters that are ridiculously low in price often have problems with insufficient capacity.
3.Auto power inverter output voltage stability.
Output voltage stability refers to the stability of the auto power inverter output voltage. In the off grid solar power system, the voltage of the battery terminal voltage fluctuates greatly during charging and discharging, and the voltage fluctuation of the lead-acid battery can reach about 30% of the nominal voltage, so the auto power inverter must have good output voltage stability to ensure the off grid solar power system is better,then can works within the large DC input range.
In the operation of off grid solar power generation system, sine wave inverter reliability is one of the main factors that affect the reliability of the off grid solar power system. Its reliability requires the sine wave inverter to have good protection functions, including overcurrent protection and short circuit protection in the sine wave inverter. In the normal operation of the solar electricity system, due to load failure, human error and external interference, etc. It is highly probable that the current of the power supply system is too large or short-circuited. To improve reliability, the inverter must be required to have related protection features.
Startup performance refers to the ability of the sine wave inverter to start with load and the performance of dynamic operation. The sine wave inverter should be able to guarantee its normal start-up at the rated negative level. In general, when the resistive load is working, the pure sine inverter has better starting performance. However, if it is an inductive load, such as a motor, refrigerator, air conditioner or high-power water pump, the power may be several times higher than the rated power. Usually when the inductive load starts, the pure sine inverter will withstand large surge power. Therefore, the startup performance of the pure sine inverter requires that the internal components of the pure sine inverter can withstand multiple full-load startups without causing damage to the power device when the inductive or other load is started.
When the pure sine inverter output voltage waveform is a sine wave, it contains harmonic components in addition to the fundamental wave. Usually, the ratio of the harmonic components in the total output voltage waveform is called harmonic distortion. Higher harmonic currents can create eddy currents in inductive loads, causing the device to heat up and severely damaging electrical equipment. Generally, the off grid inverter will indicate its harmonic distortion. The harmonic distortion of the off grid square wave inverter is about 40%, generally only suitable for pure resistive load; the harmonic distortion of the off grid modified wave inverter is less than 20%, suitable for most loads; and the off grid sine wave inverter Harmonic distortion is small and can be applied to all AC power loads.
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