PowerTech MP3741 User Manual

Page 20
NOTE:
1) When the battery type is sealed, gel, flooded, the adjusting range of
equalize duration is 0 to180min and boost duration is 10 to180min.
2) The following rules must be observed when modifying the parameters value
in user battery type (factory default value is the same as sealed type):
a. Over Voltage Disconnect Voltage > Charging Limit Voltage ≥ Equalize
Charging Voltage ≥ Boost Charging Voltage ≥ Float Charging Voltage >
Boost Reconnect Charging Voltage.
b. Over Voltage Disconnect Voltage > Over Voltage Reconnect Voltage
c. Low Voltage Reconnect Voltage > Low Voltage Disconnect Voltage ≥
Discharging Limit Voltage.
d. Under Voltage Warning Reconnect Voltage > Under Voltage Warning
Voltage ≥ Discharging Limit Voltage.
e. Boost Reconnect Charging voltage > Low Voltage Disconnect Voltage.
4 Protection, Troubleshooting and Maintenance
4.1 Protection
Solar Array Over Current
The controller will limit charge power to rated charge power. An over-sized PV
array will not operate at maximum power point, unless more controllers are
added.
Solar Array Short Circuit
When PV short circuit occurs, the controller will stop charging. Clear it to resume
normal operation.
Solar Array Reverse Polarity
The controller is fully protected against reverse polarity, no damage to the
controller will result. Correct the wiring to resume normal operation.
WARNING: This only applies if the Panel voltage is within the
acceptable open-circuit voltage range!
Battery Reverse Polarity
Fully protected against battery reverse polarity, no damage to the controller will
result. Correct the wiring to resume normal operation.
Battery Over voltage
When battery voltage reaches the pre-set over voltage trip point voltage the
controller will stop charging the battery to protect it
Battery Over discharge
When battery voltage drops below the pre-set low voltage trip point, the
controller will disconnect the battery from the “Load” output to prevent over-
discharge. NOTE: This only protects the battery from over-discharge via the
Load terminals. There is no protection from devices that connect direct to the
battery.
Battery Overheating
(NOTE: Only applicable if Remote Temperature Sensor is fitted) The controller
detects the battery temperature through the external temperature sensor. If the
battery temperature exceeds 65ºC, the controller will automatically start the

PowerTech MP3741 Specifications

General

Brand	PowerTech
Model	MP3741
Category	Controller
Language	English