What is the off grid inverter?

The off grid inverter is an indispensable part of the AC photovoltaic power generation system. Due to various technical or policy reasons, it will take a long time to connect all independent photovoltaic AC power generation systems to the national unified power grid. Therefore, the market distinguishes photovoltaic inverters into two types: photovoltaic off grid inverterand photovoltaic grid connected inverter.

• What are the characteristics of an off grid inverter?

• What is the working principle of off grid inverter?

• What is the difference between an off grid inverter and a grid-connected inverter?

What are the characteristics of an off grid inverter?

1. The output power factor of the off grid inverters.

2. The off grid inverter has an automatic voltage regulator (AVR), which provides a wide and stable AC range. At the same time, it can choose a high-power charging current to meet the optional input voltage range of household appliances and personal computers.

3. The off grid inverter can be set through the LCD to set the configurable AC/battery input priority. The power-saving mode can be configured through the LCD setting. Compatible with generator power generator dry contact, realizing the function of mutual control between generator and mains.

4. The off grid inverter can automatically restart when the AC power is restored. This is overload and short-circuit protection, which improves the safety of use.

5. The off grid inverter provides intelligent battery charger design, optimizes battery performance, intelligent fan operation control, prolongs service life, and reduces noise. Color LCD.

6. The off grid inverter supports the use of lithium batteries an RS232 communication port and an optional remote control panel during use.

What is the working principle of off grid inverter?

SPWM (sinusoidal PWM) method is a mature and widely used PWM method. An important conclusion of the sampling control theory mentioned earlier: when narrow pulses with equal impulse and different shape are added to the links with inertia, the effect is the same. Based on this conclusion, the SPWM method uses the PWM waveform whose pulse width changes according to the sinusoidal law and is equivalent to the sine wave, that is, the SPWM waveform to control the on-off of the switching devices in the off grid inverter circuit, so that the area of the output pulse voltage is equal to the area of the desired output sine wave in the corresponding interval, By changing the frequency and amplitude of the modulation wave, the frequency and amplitude of the output voltage of the off grid inverter circuit can be adjusted.

What is the difference between an off grid inverter and a grid-connected inverter?

An off grid inverter refers to an inverter capable of V/f control. Its outermost loop is a voltage loop, which can stabilize the AC bus voltage and frequency. The grid-connected inverter can only inject rated power into the grid for PQ control, and the voltage and frequency of the grid-connected point are not stable. In terms of hardware structure, the DC side of the off grid inverter is mainly a battery, which can provide continuous energy input for the system, while the DC input of the grid-connected inverter is usually volatile renewable energy such as photovoltaic or wind power.

With the development of science and technology, the use range and market of off grid inverters are constantly expanding. Shenzhen Sumry Electronics Co., Ltd. has been committed to providing customers with reliable off grid inverters and perfect after-sales service so that customers can invest easily, use them with confidence, and have no worries.