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DC Switch in the previous videos we
have discussed the overall view of a
solar system briefly in this video we
will introduce DC switches employed in
solar systems in details what are DC
Switchs
DC switches are safety devices which
disconnect two different parts of the
solar system in a specific conditions
they also help to increase the safety of
the system DC Switch are used in variety of
applications such as preventing
short-circuit in the solar system
preventing the overcurrent in inverters
and other sections of the system and
enhancing the lifespan and efficiency of
the battery
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DC Switchs have different types such as
DC breakers or rotary switches you may
find a variety of these switches in the
market
here we use a circuit breaker to protect
direct current and voltage up to 500
volts DC as you can see it has two
positive and negative poles these
breakers are rail mounted DC switches
which are fixed on a rail in the solar
systems installation as you can see
there are 2 DC switches employed in our
solar system's installation the left one
connects the solar panels to the charge
controller while the other one connects
the batteries to the solar charge
controller output terminals of the
battery and the solar panel are plugged
to the DC switch by proper connectors
the polarity of the DC switch should be
noted in connections since wrong and
improper wiring will lead to short
circuit which might damage the system
the polarity of DC Switch connectors
are obvious on the switches datasheet
and also can be seen in the switches
label it is clear that the polarity of
DC swhich is different from connections
from upside or downside the datasheet of
the DC Switch provides useful
information about the operations and
technical data rated current of DC
switch in a solar system should be
determined according to the
configuration of charge controller
battery and a solar panel for example
maximum input power of the charge
controller determines the rated current
of DC switch in other words according to
the configuration of your batteries and
solar panels you can choose the right
capacity DC switch for your application
what happens when a DC switch is turned
on or off as mentioned before to DC
searches are employed in the solar
systems installation which one connects
the battery to the charge controller
while the other one connects the solar
panel to the charge controller by
pushing the black button on the DC
switch battery is connected to the
charge controller which turns the charge
controller on while the other switch
will connect the solar panel to the
charge controller and permits the energy
flow from solar panel to the charge
controller to start the charging process
of the battery again it should be noted
that the polarity is an important factor
in the DC switch installation so make
sure to connect the right terminals to
your DC switch bus bars are also used
in our system bus bars are employed to
connect various elements to each other
to prevent the confusion in wiring bus
bars are suitable to reduce the amount
of cables in the solar system's
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installation they are composed of
several terminals which are electrically
connected to each other so instead of
direct wiring bus bars utilize the
quality of wiring and power distribution
system bus bars are employed in the
installation of solar panels to
transform the connectors of both
positive and negative terminals of the
battery to the two distinct connectors
which are connected to the charge
controller and the inverter
there are various types of busbars
employed in the industry which you can
choose them according to your specific
requirement and your equipment in our
installation any of the busbars
terminals can be considered as the input
and hence others are supposed to be the
outputs of the bus bar surge
protection devices a power surge also
called a transient voltage is generally
short increase in voltage that's about a
normal level it can be caused for
example due to the natural sources such
as lighting strikes as well as internal
or external equipment devices known as
surge protectors or transient voltage
surge suppressors can route these
transient current to the ground
protecting the equipment from damage
so SPDs are also crucial elements
involved in the production of pv systems
details about implementing SPDs will be
covered in an other video in next video
we will talk about charge controllers
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