Ten factors disturb Photovoltaic power generating
As?is?well-known，Photovoltaic power generating capacity calculation method: Theoretical annual?energy?output= The average annual solar radiation amount+ Total area of the battery +?photoelectric conversion efficiency . But due to various reasons
The actual power is not so much, the following are the ten factors
1．The amount?of?solar?radiation
Under certain situation , the conversion efficiency of solar cell component of the Pv system is dependent on the sun’s radiation intensity . The radial energy utilization efficiency of Pv systems is only 10%. Photovoltaic power station power is directly related to solar radiation.
2．The tilt Angle of solar cell components
For total solar radiation on the surface of the tilt and Solar radiation straight separation principle. The amount of solar radiation on the surface of the tilt= The sky scattering quantity + The ground reflection radiation
3．The efficiency of solar battery components
In this century. ?Solar photovoltaic in China has entered a rapid development period. The efficiency of the solar cell is improving. With the help of nanotechnology, the future silicon conversion rate could reach 35%.
4 .Assembling loss.
All string will be due to differences in current component current losses;
Always and even will voltage loss because of components of the voltage difference
In order to reduce portfolio losses, there should be installed in the plant before the selected current components in series。Sometimes Isolation diodes is necessary.
?When temperature rise 1?, crystalline silicon solar cell :The maximum output power decrease 0.04%, Open circuit voltage drop 0.04%(-2mv/℃), Short circuit current rise 0.04%. In order to avoid the influence of temperature on electricity, you should keep components good ventilated conditions.
6．Dust loss
Plant dust losses could reach 6%. So it is necessary to wipe components often.
7．Tracking
From the point of solar battery application point of view, MPPT is the?maximum?power?output tracking.Ot can finished in the inverter of ?Grid-connected?system
8．?wire loss
Design to USES the wires with good electrical conductivity . It is necessary to have enough ?diameter of the wire and construction is not allowed to cut corners.
9．Controller, inverter efficiency
Most on grid tie inverter efficiency can arrive 95%,But it is conditional.
10．The efficiency of the battery (independent system)
Independent photovoltaic system need battery,?battery charging and discharging efficiency will affect the efficiency of the system directly.