Portable Solar generator photovoltaic energy storage system introduced

Portable solar generator photovoltaic energy storage system introduced

In addition to the space station, all other PV systems are subject to sunshine during the day and did not affect the evening sunshine. And we want to use electrical appliances, day or night, we must choose to solve this problem portable solar energy storage battery through the inverter function convert.

Storage and management of electrical energy in photovoltaic system plays a crucial role in the photovoltaic power generation system has been mindful of the solar energy storage device is commonly used lead-acid batteries, but its short life cycle, low power density, volume and other maintenance disadvantages and costs are high, due to the unstable energy, space and other characteristics of large battery can cause premature failure or loss of capacity, and further increase the cost of solar backup generator.

Lead-acid battery charging There are many ways, including the constant current charging, constant voltage charging, constant current limiting charging, charging two stage, three-stage charging, fast charging, intelligent charging, equalizing charging methods. PV systems taking into account the energy, limited investment costs and charging power of special features, and therefore in charge control PV systems has its particularity.

1. The constant current charging is performed with a constant current charging, during charging as the battery voltage changes the current to be adjusted so as to be constant. This method is particularly suitable for the battery of solar generator has a plurality of batteries in series for charging, the battery capacity to make backward easy to be restored, the best time for small current charging mode.

2.The constant voltage charging means at a constant voltage to charge the battery. Therefore, in the initial charge due to low battery voltage, charge current is large, but gradually increased as the battery voltage, current decreases. In the late charge only a small current through the charging process so that it does not have to adjust the current. Constant current charging relatively speaking, this method of charging current is automatically reduced, so little analysis of gas charging process, the charging time is short, low energy consumption and charging efficiency up to 80%, as the charging voltage selector appropriate, within 8 hours charging is completed. Backup power generator capacity to make backward easy to be restored, the best time for small current charging mode.

3.The three-stage charging:

A) constant current charging phase, the charger current is kept constant, a rapid increase in filling power, the battery voltage rises

B) constant voltage charging phase, the charger voltage is kept constant, charge into the electricity continues to increase, the battery voltage to rise slowly, the charge current drops

C) the battery is full, the charge current drops below the float conversion current, the charger voltage is reduced to the float voltage

Charge controller for photovoltaic array output power is controlled based on the actual state of the system, in a certain way back level power supply, including MPPT mode, current limiting mode and constant voltage mode. System configuration certain capacity supercapacitor, except as an energy reserve means, but also on the output of photovoltaic energy for filtering, optimized battery working environment (including the charge and discharge currents). Battery directly connected load, the main energy reserves as a grid solar system device. Parallel controller is super capacitor energy transfer to the battery control link, control its purpose is to make the battery work in an ideal state and the charge-discharge cycles at least.