batteries are one of the main parts of
solar off grid systems they reserve the
energy for later consumption
different types of batteries are used in
solar electric and backup power systems
among which lead acid and lithium ion
batteries are the most commonly used
types based on the application and depth
of discharge batteries are selected for
solar systems for example for full-time
off grid residents or remote
telecommunication projects lead acid
batteries and lithium batteries are
recommended
this is while for off-grid cabin or
vacation home sealed acid batteries
are prefered. application is not the only
principle for selecting the batteries
other principles are backup time depth
of discharge efficiency energy density
costs charge and discharge rate and
etc 
it's important to make sure that the
charge controller is completely
configured with the suitable parameters
for the batteries otherwise batteries
would not be charged well or they might
get damaged batteries come with
different cell voltages they might be 2
volts 3.7 volts 6 volts 12 volts and etc in order to fulfill the design
requirements batteries can be connected
in series or parallel together the
series connection increases the voltage
while parallel connection increases the
battery bank capacity as you can see
here we have used two 12-volt batteries
in series so the input voltage of our
system is 24 volts the battery
bank is connected to the charge
controller and inverter at the same time
when there is a sunshine batteries are
charged via charge controller and they
provide electrical energy when a
consumer is plugged in next videos we
will cover more details about solar
off-grid systems
