MT MPP170, MT MPP260, MT MPP 440
Troubleshooting
EN
25
10
Troubleshooting
Fault
Possible cause
Solution
The MPP solar charger
does not work.
Insulation faults, breaks or
loose connections at the live
cables.
➤
Check live cables for insulation
faults, breaks or loose connec-
tions.
➤
If you cannot find an error, con-
tact an authorized service agent.
Short circuit has been gener-
ated.
The device fuse must be replaced
by an authorized service agent after
it has been triggered by excess cur-
rent.
The MPP solar charger
does not work. The
“MPP” LED is flashing.
No solar panel power is gener-
ated.
The MPP solar charger automatically
switches to standby mode at night.
The generated solar power is
too low. Objects or dirt are
blocking out light at the solar
panels.
➤
Check for obstructions and
ensure that the solar panels are
not blocked by shadows.
➤
Remove any dirt.
The MPP solar charger
does not work. The
"Laden" LED is flashing
quickly.
Over voltage protection of the
house battery. Battery volt-
ages too high
(> 15.0 V).
➤
Reduce the connected voltages.
The MPP solar charger restarts auto-
matically when the voltage drops to
the restart value (< 15.0 V).
Unusually long
charging time. The
"Laden" LED is flashing
quickly.
High temperature protection:
The MPP solar charger
switches to reduced charging
voltage (12.8 V) when the tem-
perature of the battery
exceeds the cutoff value (>
50 °C).
The MPP solar charger returns auto-
matically to full charging voltage
when the temperature drops to the
restart value (< 48 °C).
Low temperature protection
(only for LiFePO4 batteries):
Reduced charging current to
protect the battery.
➤
Move the battery to another loca-
tion (> 0 °C).
The MPP solar charger operates
with the full charging current when
the temperature is > 0 °C.
Unusually long
charging time. The
"Laden" LED is flashing
slowly.
Low temperature protection
(only for LiFePO4 batteries):
The MPP solar charger
switches to reduced charging
voltage (12.8 V) when the tem-
perature of the battery drops
below the cutoff value (< –
20 °C).
The MPP solar charger returns auto-
matically to full charging voltage
when the temperature exceeds to
the restart value (> –18 °C).