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LED indicators:
"AES/RE" (surplus power display, only MT
350-PP and MT 550-PP, yellow):
• If it is lighting: Sufficient surplus solar pow-
er, the output "AES/RE" for automatic ener-
gy selection of the refrigerator or of a con-
sumer is activated.
• Off: Output "AES/RE" is switched-off.
"Batt. Full" (Battery fully charged, green):
• If it is lighting: Battery (batteries) has (have)
been charged to 100 %, trickle charge U2,
finished.
• If it is lighting dimly: Main charging process
is still effected in the charging phase U1.
• Off: Main charging process is still effected
in the charging phase I.
">80%" (green):
• If it is lighting: Battery has been charged
almost fully. Solar controller is still in the
charging phase U1.
"Charge" (green):
• If it is lighting: Brightness from slight dimly
lighting up to full brightness indicates the
charging current intensity.
• Off: Solar power is insufficient.
• If it is flashing: Safety mode battery protec-
tion: Battery temperature < -20/-30 °C or
overtemperature +50 °C, Automatic return
and continued charging in case of tem-
perature drop of the battery by 2 °C.
• If it is flashing 1 x: Disconnection of solar
overvoltage: LED "Charge" is flashing 1 x.
After that, the controller changes to stand-
by. Imperatively check the voltage (Voc) of
the solar module!
"Standby"
• If it is flashing: The controller is in stand-by
mode, if solar current is not available (at night).
"Batt. Low" (yellow): only MT 150-PP and MT
230-PP
• If it is lighting: Low voltage at main battery
I. The battery should be recharged as soon
as possible!
Operating Instructions:
• Lifetime of the battery:
– Recharge totally discharged batteries
immediately!
Sulphation of the lead battery plates
due to total discharge is to be prevented
by soon charging, particularly in case of
high ambient temperatures. If the grade
of sulphation is not too intensive, the
battery can recover part of the battery
capacity after several charging/dis-
charging cycles.
– Partially Discharged Batteries:
In contrast to other battery types, batter-
ies on lead basis do not have any harm-
ful memory effect. Consequently: In case
of doubt, partially discharged batteries
have to be charged fully as soon as pos-
sible.
Always store only fully charged batter-
ies. Recharge them periodically, particu-
larly in case of used (older) batteries and
higher temperatures.
– Keep batteries cool and dry; choose an
appropriate location for installation.
– In case of insufficient solar power and/
or high current consumption, the bat-
tery should be subject to occasional full
charging by means of a mains supply
charger.
• Overvoltage Protection:
The 12 V solar controllers protect them-
selves against connection of excessive bat-
tery voltage rates or will be switchedoff in
case of defective additional charging sys-
tems (chargers, generators or similar sys-
tems), switching threshold 15.0 –16.0 V.
• Overvoltage Limitation:
Sensitive consumers are protected by
means of a limitation of the charging volt-
age to max. 15.0 V during all modes of
charging.
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