Votronic MPP 170 CI User Manual

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Effect: The temperature-dependent charging voltage of the battery will be adapted automatically to the battery
temperature (automatic temperature equalization). The temperature sensor measures the battery temperature. In case of
low temperatures (winter operation), the charging voltage will be increased, in order to improve and accelerate full
charging of the weak battery. Sensitive consumers are protected by a limitation of the voltage in case of very low outside
temperatures.
In case of summery temperatures, the charging voltage is reduced to minimize the load (gassing) of the battery and to
extend the lifetime of gas-tight batteries.
Battery Protection: In case of excessive battery temperatures (from +50 °C), the charging voltage will be reduced strongly
to safety charging voltage, approx. 12.80 V, for battery protection and the maximum charging current rate will be halved
and safety mode, LED "MPP" is flashing ("Charge" at MPP 170 CI). Any charging data being recorded hitherto will be kept
in memory.
Battery charging is then interrupted, but the supply of consumers being possibly connected will be continued by the solar
controller, and the battery is allowed to cool down. After that, automatic charging will be resumed. Also refer to "Charging
Voltage Rates and Temperature Equalization, as well as Protection of Main Battery" on page 10.
LiFePO4 Batteries:
Installation: The thermal contact of sensor and inside temperature of the battery should be well. Thus, it should be
screwed down to the negative pole of the battery, because in case of LiFePO4 batteries, in most of the cases, this is the
cooler side (the positive pole is often falsified with the exhaust heat of internal fuses, electronic systems for cell
equalization etc.)
Effect: In case of abnormal battery temperatures, such as <-20 °C, >50 °C, the charging voltage will be reduced strongly to
safety charging voltage,
approx. 12.80 V, for battery protection, and the maximum charging current rate will be halved.
Safety mode, LED "MPP" is flashing ("Charge" at MPP 170 CI). Any charging data being recorded hitherto will be kept in
memory.
Battery charging is then interrupted, but the supply of consumers being possibly connected will be continued by the solar
controller until the battery temperature is in the admissible range. After that, automatic charging will be resumed.
Below 0 °C, the charging current will be reduced very strongly for battery protection, and longer charging times can be
expected.
The solar controller recognizes automatically a missing sensor, cable break or short-circuit of the sensor lines, as
well as unreasonable measuring values. In that case, it will switch automatically to the usual charging voltage
rates of 20 °C / 25 °C being recommended by the battery manufacturers.
Pilot Lamps:
"Float":
• Is lighting: Trickle charging U2. Voltage control, charging voltage is gradually reduced to the U2
voltage.
• Is flashing:
Temperature sensor is not connected for LiFePO4 characteristic. No charging possible!
"Absorb":
• Is lighting:
U1 phase (full charge). Voltage control, current consumption of the battery decreases
continuously.
• Is flashing: Battery over- or undertemperature. Check battery and temperature sensor if necessary!
"Bulk":
• Is lighting:
I-phase (main charge). Current control, battery is charged with the maximum available
solar power. The MPP algorithm always searches for the optimal power point of the
solar module.
• Is flashing: Battery and/or solar module overvoltage. Check battery and solar module!
"Batt. Low":
• Is lighting:
Battery undervoltage (PB < 10 V, LiFePO4 < 11 V). If possible, do not load the battery and
recharge it as soon as possible.
• Is flashing: Lithium battery below 0°C or solar regulator is internally too warm (reduced charge
current).
• Short flashing every 2 sec.:
Solar controller (MPP260 CI-MPP440 CI) is in standby mode (night or solar power too
low).
"AES" (except MPP 170 CI):
• Is lighting:
Sufficient excess solar power is available, the output "AES" for automatic energy
selection of the refrigerator or of a relay control is activated.
• Off: Output "AES" is switched-off.

Votronic MPP 170 CI Specifications

General

Brand	Votronic
Model	MPP 170 CI
Category	Controller
Language	English