A
photovoltaic system mainly consists of solar modules, controllers,
batteries, inverters and loads. The solar modules and batteries are
power-supply system; the controllers and inverters are control and
protection system; the loads are terminal system.
1. Solar panel: The solar panel is the core and the most
valuable partial of the solar energy generating system. Its function
is transforming the radiant energy of the sunlight into the
electrical energy, either transmitting the energy to the accumulator
to save, either driving load work. The quality and the cost of the
solar panel will decide the quality and the cost of the overall
system.
2. Solar energy controller: The
solar energy controller can control the working status of the
system. In the same time, protect the accumulator from over charging
and over discharging. In the area of big difference in temperature,
a qualified controller should compensate the difference in
temperature automatically. Other attachment function, like the light
control switch, the time controls switch are options.
3. Battery: Generally, the
battery is the lead-acid battery. I small system, it also can use
nickel hydrogen battery, the nickel cadmium battery or the lithium
battery. Function: store the electrical energy sending out by the
solar panel, release it when needed.
4. Inverter: Usually, we have to offer 220AC and 110AC.
Because the solar energy direct output is 12VDC, 24VDC or 48VDC.We
have to use the DC-AC inverter and transform them to alternating
current. Sometime we should use the DC-DC inverter.
The design of
solar energy generating system should consider the following
factors:
1. In which area the system will be used? How about the
sunlight radiation in this district ?
2. What about the load power ?
3. What about the output voltage? Direct current or
alternating current ?
4. How many hours does the system need to work every day ?
5. how many days the system have to supply the power
continuously when meet the overcast weather ?
6. The situation of load, the pure resistance, the capacitive
character, inductive character, the starting current ?