The voltage of the independent solar power generator
system matrix is often designed to correspond to the battery nominal
voltage or their integer multiple, and with the electrical voltage
level. Such as 12V, 24V, 36V, 48V and so on. AC solar power supply
system and on grid solar power generation system, the design is 110V or
220V and so on. The matrix is a collection of many components, but also
need cables, blocking diodes and bypass diodes to make electrical
connections to the components, and need to be equipped with a dedicated.
Substation and total junction box with arrester. In bird areas to
prevent bird droppings caused by hot spots, need to install
bird-fighting devices.
The principle of the composition of the square.In series, the components
with the same operating current are required, and the bypass diodes are
connected to each component.Parallel operation requires the same
voltage components, and in each parallel series blocking diode.Consider
the principle of the shortest possible interconnection of components and
use thicker wires.To strictly prevent individual performance
deterioration of the solar cell components mixed into the square.
Measurement methods
The measurement of the square matrix is very difficult to carry on under
the standard condition, usually uses in the natural sunlight to use the
portable photovoltaic square meter examination then transforms to the
information IEC standard condition. Special attention should be placed
on the standard photovoltaic cells in the same square of the measured
square array, measured before the opaque material will be closely
covered by the phalanx measured, such as the temperature and the ambient
temperature when the cover suddenly opened, as short as possible Of the
time, the square after the square of the light-emitting characteristics
of the volt-ampere curve and the basic parameters, compared with the
standard reference battery, calculate the square in the standard case of
the output power.
Uneven irradiation and "hot spot"
When an array of solar power batteries is partially obscured or damaged
for external reasons, the rest of the array is exposed to sunlight, so
that partially shaded cells are bound to provide the necessary part of
the load from the remaining batteries. Total power. This makes some of
the battery as a diode in the reverse current operation, the resistance
and voltage drop will be great, so as to absorb power and lead to heat,
which may damage or even damage the battery, because the solar battery
appears high temperature, so called "Hot spot". In order to avoid the
"hot spot" solar power generation, usually "bypass diodes" and "blocking
diode" approach to solve. With a block of the solar cell series circuit
to U that is generated by the "hot spot".
Bypass diodes prevent individual solar power batteries
in a series circuit from being damaged due to being shielded, while
also avoiding power losses due to the array being discharged through
this shielded battery. Blocking diodes prevent the array from being
discharged through this branch when a parallel branch in the array is
unable to solar generate power due to being blocked. In general, these
diodes have two functions. One is to prevent damage to those solar cells
or modules that are occluded, and the other to prevent serious
degradation of the overall efficiency of the array when some solar cell
elements are blocked.
The article from : http://www.storagebattery-factory.com/news/solar-power-battery-square-structure.html
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