Technical data

PV
OFF GRID
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Steca Elektronik GmbH | 87700 Memmingen | Germany | Fon [phone] | Fax [phone] | www.stecasolar.com
P V - O F F G R I D
A
D
C
B
E
F
Legend:
A Generator
B Solar Charge Controller
C Battery
D Generator connection box
E Current Consumer (12 V-)
A
C
B
E
D
Battery
Solar charge
controller
12 V-
load
Generator
Solar charge
controller
Solar home systems
with Steca solar charge controllers
A solar home system consists of a Steca solar
charge controller, one or more solar modules, a
battery and the connected loads.
The solar charge controller is connected directly
to the battery using as short a cable as possible,
and fixed to the wall near to the battery, so that it
can be effectively cooled by the passing air flow.
In principle, the battery is always connected to
the charge controller first. Then the solar module
field is connected to the solar module input of
the charge controller. Only direct current loads
are used in solar home systems. They are con-
nected directly to the load output of the char-
ge controller. This means the Steca solar charge
controllers always show the exact charge status
of the battery, and thus ensure optimal battery
maintenance in all situations. Various Steca ener-
gy-saving lights, Steca solar cooling units, DC-to-
DC converters and other appliances can be used.
The Steca solar charge controllers control the en-
ergy flow of the entire system. They make sure
that the solar module charges the battery quickly
and effectively, but they also protect the battery
against overcharging. If the loads discharge the
battery, the charge controller, thanks to its pre-
cision in calculating the charge status, switches
off the load at exactly the right moment, thus
protecting the battery from the dangers of deep
discharge.
Furthermore, Steca charge controllers are equip-
ped with an intelligent battery monitoring sy-
stem. The most effective charging method is
selected according to the requirements of the
batteries. The charge controller is the central con-
trolling component in solar home systems, since
it affects all the functions of the system. For this
reason, it is important to choose a reliable and
efficient charge controller.