Photovoltaic power generation system with battery working conditions

Photovoltaic power generation system with battery working conditions




In the photovoltaic power plant using the environment, lighting conditions are good (for day), solar battery components to receive sunlight, the output power, part of DC and AC load of work, another part of the supply battery charger, when bad light conditions (night or rainy days), Solar battery components can not work, battery power supply, the supply of DC or AC load, the battery is in a cycle of state, therefore, in this use of the environment, the battery life cycle life.

The batteries used in PV systems in the working conditions and batteries used in different working conditions on other occasions. The main differences can be summarized as the following:

(1) charge rate is very small, due to cost, location, space and so on, the number of solar cells will be ruthless put huge constraints, in order to ensure the normal use of the power system is often provided to the battery charging power has become very limited, the average charge current generally 0.0510 ~ 0.110, ruthless little to 0.110.

(2) The discharge rate is very small, too much energy system designed to take into account the maximum load capacity, the longest standby time, larger capacity battery configuration, but the actual process of using the design load the load is relatively much smaller, battery discharge rate is usually 20 ~ 240, or smaller.

(3) due to natural resource constraints, battery only when there is sunlight in order to charge: the charge time is limited.

(4) can not be given the charge according to the laws of the battery to recharge.

Photovoltaic power generation system for battery performance requirements:

Photovoltaic power generation system in charge of the battery frequently - the repeated renewal of discharge cycle, due to the instability of sunshine, over charge and deep discharge adverse situations have occurred, coupled with photovoltaic power generation system used mostly in the western region, altitude are more than 2,500. Therefore, the photovoltaic power generation system in the battery has the following requirements:

(1) has a deep-cycle discharge performance, long charge-discharge cycle life

(2) resistance to overcharge ability

(3) Cross-discharge capacity recovery after the strong ability

(4) Good charge acceptance

(5) The battery in a static environment, when used in the electrolyte layer is not easy

(6) has a maintenance-free performance of maintenance or less

(7) should have a good high and low temperature charge-discharge characteristics of

(8) can adapt to high altitude (elevation above in 2500) area of the use of the environment

(9) battery in the battery good consistency.



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