User Manual for iTechworld 12/24V 40Amp MPPT Solar Charge Controller

Quick guide from the manual

This solar charge controller is designed to optimize solar and battery systems. For safe and efficient operation, always follow the correct installation sequence: connect the battery first to allow the controller to recognize the system voltage, then connect the load, and finally the solar array. When disconnecting, reverse this order (Solar, Load, Battery). Ensure all wiring is done by a certified technician and that external fuses are installed as close to the battery as possible.

Installation and Wiring

The controller should be mounted vertically in a dry location with adequate ventilation. Allow at least 15cm of space above and below the unit and 5cm on the sides.

• Wiring: Use flexible, multi-stranded copper wire with a current rating of at least 50A.
• Fuses: External fuses are required. A battery fuse must be installed within 15cm of the battery.
• Polarity: Ensure correct polarity for all connections. The controller is a common positive device.
• Load Output: Do not exceed 40A on the load output. Large loads like inverters should be connected directly to the battery.

Unit Operation and Settings

The controller features an LCD screen for monitoring and programming. Use buttons A and B to navigate menus and change parameters.

• Menu Navigation: Short press buttons A or B to cycle through parameters like ambient temperature, charge current, and accumulated AH.
• Settings Menu: Press and hold button A for >3 seconds on the home screen to enter settings.
• Changing Parameters: Hold button A until the value flashes, adjust with A/B, then hold A for >3 seconds to save.
• Battery Selection: Navigate to the Battery Type menu. Select the profile matching your battery chemistry (Gel, Sealed, Flooded, or Lithium).
• Lithium Batteries: If using iTechworld lithium batteries (e.g., iTECH120X), you must select the 4-3.2 profile.
• Load Control: Various modes are available, including manual control, light control (dusk-to-dawn), and dual-time modes.

Troubleshooting

If the controller displays a fault code or is not functioning correctly, refer to the following:

• Not charging: Check if solar input is disconnected or if solar voltage is lower than battery voltage.
• No display: Battery voltage may be below 8V, or connections are incorrect.
• Over temperature (Ex5): Ensure ventilation is not blocked. The unit will restart automatically once cooled.
• Overload (Ex3): Reduce the load connected to the load output.

Specifications

Key operating parameters for the controller:

• System Voltage: 12/24VDC Auto sensing.
• Max Solar Input Power: 520W (12V system) / 1040W (24V system).
• Max Open Voltage: 100VDC.
• Rated Charge Current: 40A.
• Operating Temperature: -20°C to +55°C.