OPERATING INSTRUCTIONS
SOLAR CONTROLLER
CE
SC 10A, 20A, 30A
SCD 10A, 20A, 30A
- automatic recognition of the system voltage 12/24 V
- temperature-controlled
charge
regulation with gassing control
- exhaustive discharge protection with early warning
- module and power load shutdown in the plus circuit
Dear Customer,
Thank you for placing your trust in us. You have purchased one of the most powerful, compact and reliable solar
controllers in its class.
Please read the instructions carefully before starting up your solar system.
ATTENTION!!! Important safety instructions!!!
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Never operate the unit under unfavorable environmental conditions. Unfavorable conditions include:
ambient temperatures over 50° C, flammable gases, solvents, vapors, dust, relative humidity over 80 % and
wetness.
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The unit may only be used in dry, closed rooms.
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If it is to be assumed that safe operation is no longer possible, the unit must be shut down immediately and
secured against unintentional switching on. Safe operation cannot be assumed if the unit has visible
damage, transport damage or after storage under unfavorable conditions.
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If the overcharging protection breaks down, hazardous electrolytic gas may develop around the battery.
Make sure, therefore, that the battery is installed in a well-ventilated place.
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With the help of the serial control, batteries can also be recharged by means of other power sources, for
example standard power supply units.
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Observe the correct sequence for connection. Disconnection takes place in the reverse sequence (see
Installation).
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In order to avoid short circuits on the line between the collar controller and the battery, an additional fuse
must be installed at the plus pole.
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Consumers which, due to their function, are not disconnected from the battery by switching off the load,
must be connected directly to the battery via a fuse.
Function description
Lead batteries are generally used for the storage of energy in photovoltaic solar systems. Lead batteries have to
be protected against exhaustive discharge and overcharging. This solar controller fulfils both requirements.
Exhaustive discharge protection
Lead batteries have to be protected against exhaustive discharge to prevent damage to the cells. The solar
controller protects the batteries reliably against exhaustive discharge by shutting down the DC power load when
the end-point voltage is reached. As soon as the batteries have been sufficiently recharged by the solar cells the
load is switched on again automatically.
Overcharge protection
When the full charge has been exceeded, the battery begins gassing. Heavy gassing leads to a loss of fluid and
can cause the formation of electrolytic gas through the leaking of hydrogen. If, due to the loss of fluid, parts of
the battery plates are not covered with electrolyte, the battery can be damaged. If heavy gassing should
nonetheless occur, eliminate the cause (see table) and check the water level. The gassing behavior of batteries
is temperature-dependent. The end-point voltage is adapted automatically to the ambient temperature by the
built-in temperature sensor. When the full charge voltage is reached the battery is still not fully charged. The
charging current is then reduced, so that the full charge voltage is not exceeded. This is called trickle charging
and charges the battery gently and quickly. The solar controller works on the principle of pulse-width modulated
serial control, i.e. the regulation at the charge limits is achieved by modulation of the charging current from the
solar module. Alternatively, chargers or stabilizers can be used for charging via the module input.
Gassing control
If a lead battery is operated for a prolonged period without the controlled formation of gas, damaging acid layers
can be formed. The solar controller eliminates or reduces the formation of acid layers by ensuring gentle,
controlled gassing. This behavior is also temperature-dependent and is compensated by the integrated
temperature sensor. The solar controller is suitable for the charging of lead-acid, lead-fleece and lead-gel
batteries as the thresholds are selected in such a way that the recombination of hydrogen within the closed cells
takes place without triggering of the pressure release valve.
Temperature compensation