How to fix PowerTech Controller charging LED when it is OFF during the daytime?
If the charging LED is off on your PowerTech Controller during the day, even when sunlight is properly hitting the PV array, it could be due to an open-circuit in the PV array. Check the PV array connections to ensure they are correct and tight.
What to do if PowerTech MP3749 Controller battery frame and fault icon blink?
If the PowerTech Controller's battery frame and fault icon are blinking, it could be due to several reasons. First, the battery voltage might be too high. Verify if the battery voltage exceeds the OVD (over voltage disconnect voltage), and if it does, disconnect the PV array connection. Second, the battery might be over-discharged; in this case, the load will recover when the battery voltage reaches or exceeds the LVR (low voltage reconnect voltage). Third, the battery might be overheating; the controller will resume functioning once the battery temperature drops to 55°C or below.
Why my PowerTech Controller is not working when the wire connection is correct?
If your PowerTech Controller isn't working despite correct wire connections, it might be because the battery voltage is too low. Ensure the battery voltage is at least 8V to activate the controller.
General| Brand | PowerTech |
|---|---|
| Model | MP3749 |
| Category | Controller |
| Language | English |
Explains symbols used in the manual for safety and operation.
Provides a general overview of the MPPT solar charge controller's technology and features.
Details the physical characteristics and components of the MPPT solar charge controller.
Explains the naming convention used for the MPPT solar charge controller models.
Provides crucial safety precautions and advice for battery handling and installation.
Specifies requirements for connecting PV modules in series to the controller.
Explains the controller's current/power limiting function and PV array power handling.
Details the recommended wire sizes for PV and battery connections.
Explains how to control utility/generator and load disconnection using dry contacts.
Provides instructions and safety warnings for mounting the controller.
Illustrates the installation setup for a single MPPT solar charge controller.
Illustrates the installation setup for multiple controllers connected in parallel.
Details the grounding requirements for the common-negative controller system.
Instructions for connecting remote sensors and RS485 communication accessories.
Steps to safely power on the controller after installation.
Explains the meaning of the indicator lights on the controller.
Describes the functions of the controller's buttons in different modes.
Details the status descriptions and browsing interface of the LCD display.
Provides a detailed explanation of fault and charging indicators on the LCD.
Instructions for clearing generated energy and switching temperature units.
Lists supported battery types and how to set them via LCD.
Explains how to configure battery types using PC software or mobile APP.
Details voltage control parameters for different lead-acid battery types.
Lists voltage control parameters for various lithium battery types.
Defines rules for modifying user-defined parameters for lithium batteries.
Describes various protection mechanisms built into the controller.
Provides recommended inspection and maintenance tasks for optimal performance.
Lists common issues, their faults, and recommended solutions.
Details ongoing maintenance checks, including safety precautions and inspections.
Lists electrical specifications like voltage, current, power, and efficiency.
Details mechanical specifications such as dimension, mounting, and weight.
Lists environmental operating and storage conditions for the controller.
Outlines the safety and EMC certifications the controller complies with.
Provides detailed physical dimensions and mounting hole specifications.
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