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(1) when the continuous rain and the battery power is large, whether or not the battery pack to the discharge termination voltage, should be timely recharge the battery with the mobile power generation device. To prevent the battery capacity is not full, then to the rainy day, resulting in power supply interruption, and due to battery is not charged in time after discharge leading to reduce the battery life.

(2) due to battery operation mode is not completely float operation mode, the battery service life is shorter than that of the conventional power supply system. Should grasp the battery capacity, especially after a few years of use, should test the capacity of the battery group before the rainy season comes, if the capacity can not meet the requirements, should take measures timely.

(3) the cable connect the solar cell array to the solar power supply combined power supply is partly outdoors, should regularly check whether the cable is aging and the connection is intact.

(4) in order to better play the effectiveness of solar cells, adjust the solar cell array plane tilt angle according to the season.

(5) the surface of the solar cell array should be kept clean and tidy, otherwise it will affect the power generation of solar cell array.

(6) the battery compartment suitable temperature is 5 to 30 DEG C, the humidity is less than or equal to 85%RH. While using the solar panels inverter systems, the room should pay attention to keep warm and ventilation. Room ambient temperature is also a factor that can not be ignored, should take appropriate measures, such as the use of solar battery inverter, change the DC inverter to 220V AC to solve the room air conditioning.

The waveform of the output of the solar powered inverter is step wave, and there are many kinds of different lines to output step wave, and the number of the output waveform is very different. The advantage of the step wave solar energy inverter is that the output waveform is significantly improved than the square wave, the higher harmonic content is reduced, and the modified sine wave can be realized when the step is more than 17. When there is no transformer output, the efficiency of the whole machine is very high. The disadvantage is that there are more power switches used in the step wave superposition circuit, and some of them are also required to have multiple sets of DC power input. These bring trouble to the grouping of the solar cell array and the balance charging of the wiring and the accumulator. In addition, the step wave voltage still have some high-frequency interference on the radio and some communications equipment.

One kind is power modular type UPS. Power modular Rackmount UPS is composed of a rackmount and power module, the power module including traditional UPS rectifier, filter, charging, inverter and so on. But the static bypass and the part of the system monitor and display the same rackmount. Each module is independently controlled in parallel operation, and the display control module on the upper part of the cabinet is only used as a platform to switch the UPS host and network monitoring by the user. The rackmount modular uninterruptible power supply is composed of rackmount and single module composition, each module is equipped with the UPS and the control circuit, including rectifier, inverter, static bypass switch and auxiliary control circuit, CPU main control panel. Each UPS module has an independent management system. Relative to electronic technology and components development, two kinds of structure have their own advantages, also have very good representative products, provides the advanced distributed parallel technology, make the UPS system is not limited by the centralized control technology of reliability constraints, to avoid failure bottleneck, provides N + X parallel redundancy function modular parallel system.

The AC voltage waveform of square wave inverter is square wave. The circuits used in such inverters are not exactly the same, but the common characteristic of them is that the circuits is relatively simple, and use a small number of power switches. The power is generally designed between 100w to 1kw. Square wave inverter has the advantage of simple, cheap, easy to maintenance. The disadvantage is that due to the square wave voltage contains a large number of high harmonics, with iron core inductance or transformer load with electrical equipment will produce additional loss, and can interfere some communication equipment. In addition, this type of inverter has some other disadvantages such as the voltage regulation range is not wide enough, the protection function is not perfect, the noise is relatively large and so on.

Solar powered inverter not only has the function of direct AC conversion, but also has the fuctions of maximize solar cell and system maintenance. Here we introduce the functions of active operation and shutdown , and maximum power point tracking briefly.

1.Active operation and shutdown
After sunrise in the morning, the intensity of the solar radiation is gradually strengthened, and the output of the solar cell increases. When the output power of the inverter is reached, the solar powered inverter is active. After entering the operation, the inverter will always look after the output of the solar cell module, as long as the output power of the solar cell component is greater than the output power of the inverter need, the inverter will continue to run;
until sunset, the inverter shut down. The solar powered inverter can run even if the rainy day. When the output of the solar cell module becomes smaller, the output of the inverter is close to 0, the inverter will enter the standby mode.

2.Maximum power point tracking(MPPT)
The output of the solar cell module is changed with the solar radiation intensity and the temperature of the solar cell component itself (chip temperature). Because other solar cell module has the characteristic of the voltage decreases with the increase of current, thus has the best task point can reach the maximum power. The intensity of solar radiation is always changing, and the most obvious point is in the transition. With regard to these changes, make the solar cell components always reach the task point at the maximum power point, the system obtain maximum power output from the solar battery components, this control is the maximum power point tracking. The biggest feature of the solar panel inverter is the maximum power point tracking (MPPT).