Home power inverter system is a system that converts solar energy into electric energy by using solar cell module, storage battery, controller, inverter and other auxiliary equipment. During the day, under the illumination condition, the solar cell module generates a certain electromotive force, and the solar cell array is formed by the series of components, so that the voltage of the square matrix can reach the requirement of the system input voltage.Then charge the battery using the charging and discharging controller, and the electric energy converted by the light energy can be stored. In the evening, the battery group is provided with an input power for the solar inverter, the DC is converted into AC through the inverter, for the use of AC equipment. The discharge of the battery pack is controlled by the controller to ensure the normal use of the battery. PV power station system should also have limit load protection and lightning protection devices, to protect the system equipment from over load operation and lightning, to maintain the safe use of system equipment.
In common, that is, the high power electrical products applying the principle of electromagnetic induction, such as electric motors, compressors, relays, fluorescent lamps and so on. This type of product requires a much larger current (about 5-7 times) than the current required to maintain the normal operation. For example, a refrigerator in the normal operation of about 150 watts of power consumption, the power can be up to more than 1000 watts. In addition, due to inductive load will generate the back EMF voltage in the moment of the power supply is switched on or off, the voltage peak is far greater than the voltage value which inverter can stand, it is easy to cause the instantaneous overload of vehicle inverter, affects the using life of inverter. When measuring the AC output of the modified sine wave vehicle inverter by using a common universal meter, the voltage is 20V lower than 220 volts. Problems occur in the operation of precision equipment, can cause high frequency interference to the communication equipment.
Open the inverter switch in the front of the panel, the inverter is about to change the DC power of the battery into pure sine wave alternating current, output by the ACOUTPUT of the rear panel.
Automatic voltage stabilizing function: When the battery voltage is fluctuated between the undervoltage and the overvoltage, and the load is changed in the rated power, the device can automatically output voltage.
Overvoltage protection function:
When the battery voltage is greater than the overvoltage, the device will automatically cut off the inverter output, the front LCD panel display “overpressure”, the alarm sound and the buzzer sends out ten seconds. When the voltage is down to “overvoltage recovery point”, the inversion recovery work.
Undervoltage protection function:
When the battery voltage is lower than the “undervoltage point”, in order to avoid excessive discharge to damage the battery, the device will automatically cut off the output. At this time, the front panel LCD display “undervoltage”, and the buzzer alarm sound ten seconds. When the voltage is up to the “undervoltage recovery point”, the inverter recover to work; if there is a switching device, automatically switch to the city output when undervoltage.
Overload protection function:
If the AC output power exceeds the rated power, the device will automatically cut off the inverter output, the front panel LCD display “overload”, at the same time, the buzzer sends out ten seconds alarm sound. Off the front panel of the “inverter switch”, “overload” display disappeared. If you need to reboot, you must check to confirm the load in the allowable range, and then open the “inverter switch”, to restore the output of the inverter.
Short circuit protection function:
If the short circuit of the AC output circuit, the device will automatically cut off the inverter output, the front panel LCD display “overload”, at the same time, the buzzer alarm ten seconds. Off the “inverter switch” of the front panel, “overload” display disappeared. If you need to reboot, you must check to confirm the output circuit is normal, and then open the “inverter”, to restore the output of the inverter.
Overheating protection function:
If the temperature of the control part of the internal chassis is too high, the device will automatically cut off the inverter output, the front panel LCD display “overheating”, at the same time, the buzzer sends out ten seconds alarm sound. After the temperature is restored to the normal value, the output of the inverter is recovered.
Battery reverse protection function:
If the positive and negative polarity of the battery reversed, the chassis of the fuse will automatically fuse to avoid damage to the battery and equipment. But it is still prohibited to reverse the battery!
The optional city power switching function:
If choose the city power switching function, when the battery undervoltage or inverter failure, the equipment will automatically switch the load to the city power supply, so as to guarantee the stability of the power supply to the system. After the inverter can work normally, it will automatically switch to the inverter power supply.
Pure sine wave output: Relative to square wave or modified sine wave (step form) has a stronger load effect and capacity. Equipment can be loaded with inductive load and any other types of general AC load, with refrigerators, TV sets and radios and other equipment without interference and noise, and will not affect the performance and life of load equipment.
High stability: Due to the system with the improved protection function of over-voltage, under voltage, overload, overheating, short circuit, reverse connect and so on, so as to ensure the stability of the system.
LED display: LED display battery voltage and output voltage as well as state parameters. High efficiency transformer isolation: high efficiency, low no-load loss.
Digital intelligent control: The core device by powerful microcontroller to control, making the structure of the external circuit simple, and control method and control strategy is powerful and flexible, so as to ensure the excellent performance and stability.
Optional city electric switch: If choose the power switching function, in the situation of battery under voltage or pure sine wave inverter failure, the device can automatically switch to the city power supply, thus ensuring the stability of the system power supply.
1.Using environmental conditions Solar off grid inverters normal use conditions: altitude is not more than 1000m, air temperature of 0～+40℃.
2.DC input power supply condition Input DC voltage fluctuation range: ±15% of battery rated voltage.
3.Rated output voltage Under the specified input power supply conditions, when output the rated current, the rated voltage of the inverter should be output.
4.Rated output current Under specified output frequency and load power factor, the rated current of the inverter should be output.
5.Rated output frequency Under the specified conditions, the rated output frequency of the fixed frequency inverter is 50Hz:
6.Maximum harmonic content When the pure sine wave inverter under resistive load, the maximum harmonic content of output voltage should be less than or equal to 10%.
7.Overload capacity Under specified conditions, in a relatively short period of time, the capacity of the output of the inverter over the rated current value. The overload capacity of the inverter should meet certain requirements under the specified load power factor.
8.Efficiency Under the rated output voltage, the output, the current and the prescribed load power factor, the output power of the inverter is compared with that of the input active power (or DC power).
9.Load power factor
The allowable variation range of the load power factor of the inverter, the recommended value of 0.7 – 1.0.
10.The non symmetry of load
In the 10% asymmetric load, the non-symmetry of fixed frequency three-phase inverter output voltage should be less than or equal to 10%.
11.The non-symmetry of output voltage
Under normal operating conditions, the load is symmetric, the non-symmetry of output voltage should be less than or equal to 5%.
12.Starting characteristics Under normal operating conditions, the inverter can normally start 5 times in full load and no load operation.
13.Protection function Solar inverter should be set: short circuit protection, over current protection, over voltage protection, under voltage protection and lack of phase protection.
14.Interference and anti interference Solar inverter should be able to stand the general environment of electromagnetic interference under the normal working conditions. The anti interference performance and electromagnetic compatibility of the solar inverter should meet the requirements of the relevant standards.
15.Noise
The inverter which not often operation, monitor and maintain should be less than 95db; The inverter which operate, monitoring and maintenance regularly should be less than 80db.
16.Display The solar energy inverters should be provided with the data of AC output voltage, output current and output frequency, and there are input live, power and fault status of the signal display.
Determine the technical conditions of the solar inverter: When the photovoltaic / wind power system is selected, firstly need to determine the main technical parameters of the inverter: Input DC voltage range, such as DC24V, 48V, 110V, 220V, etc.; Rated output voltage, such as three phase 380V, or single phase 220V; Output voltage waveform, such as sine wave, trapezoidal wave or square wave.
