T-MAX DUAL BATTERY SYSTEM - User Manual

The T-MAX Dual Battery System is an intelligent battery monitor designed for off-road recovery vehicles, commercial trucks, 4WDs, expedition vehicles, yachts, and mobile homes. It provides comprehensive monitoring and management of a dual battery setup, ensuring optimal performance and longevity of both main and auxiliary batteries.

Function Description:

The primary function of the T-MAX Dual Battery System is to display the stored energy of both the main and auxiliary batteries, as well as the charge voltage when they are being charged by an alternator, solar panel, or other power sources. It automatically links the batteries for charging and isolates them during discharge to prevent the main battery from being drained by auxiliary loads. In emergency situations, a manual override function allows users to link the batteries together.

Important Technical Specifications:

• Supply Voltage: 8-16V
• System Voltage: 12V
• Measuring Range: 8-16V
• Display Range (Battery Voltage): 11-14.5V
• Display Range (Battery Charging Voltage): 13-14.5V
• Accuracy: +/-2%
• Consumption (Standby): 5mA
• Consumption Max. (Display Active 45s): 150mA
• Isolator Switch-on Threshold: 13.3V
• Consumption On-state: 0.8A
• Relay Continuous Load Current: 250A
• Operating Temperature: -20 to +60°C
• Dimensions: 103 x 21 x 66mm
• Sealing Standard Version: IP40

Dual Battery System Wires:

• Red: +battery (main)
• Black: -battery (gnd)
• Blue: +battery (aux)
• Green: control solenoid

Usage Features:

Display of Battery Voltage:

After pressing the display button, the battery voltage of each battery is visible for 45 seconds. LED indicators provide quick status updates:

• Green: Batteries are in the safe working range.
• Yellow: Check batteries.
• Red: Battery should be charged. Voltage levels correspond to charge percentages:
• 12.6V = 100%
• 12.4V = 75%
• 12.2V = 50%
• 12.0V = 25%

Display of Charge Voltage While Charging:

The LED display also indicates the charging voltage:

• Red light (>14.5V): Batteries may be overcharged, potentially causing damage.
• Yellow light (>14V): Standard battery charging mode.
• Green light (<14V): Save charge mode, no damage to batteries. A glimmering LED indicates that the main battery voltage is insufficient or the Dual Battery System is malfunctioning. Users should check the main battery or connections to prevent damage.

Automatic/Manual Battery Link:

Automatic Battery Link:

When the engine is running, the main and auxiliary batteries are automatically linked for parallel charging from the alternator (indicated by a green LED). When the engine is stopped, the batteries automatically disconnect after a delay. This ensures that auxiliary appliances (fridges, lights, compressors, inverters) are safely powered by the auxiliary battery without draining the main starter battery. The system intelligently recognizes charging from either the alternator (main battery) or a solar power/charger (auxiliary battery) and links the batteries accordingly.

Manual Battery Link (Override Function):

In emergency situations, such as a defective or empty main battery, or when higher power consumption is needed, the user can manually link the main and auxiliary batteries by activating the AUTO/LINK button. A red LED indicates that the batteries are manually linked. After 30 minutes (or immediately after activation), the system automatically returns to automatic mode. This load-sharing function reduces stress on the alternator, wiring, and batteries, especially when using electric winches. If prolonged high power consumption is required, pressing the AUTO/LINK button again will return the system to automatic mode (red LED off), then pressing it within 6 minutes will prevent battery separation. The system will auto-reset after approximately 30 minutes.

Maintenance Features:

Emergency Instructions:

In cases where the dual battery system is damaged by fire, welding spikes, salt water, or vehicle crashes, specific steps can be taken to manually link the batteries:

1. Cut the green wire: Cut the green wire leading to the solenoid (terminal 2), ensuring enough length remains to make contact with the negative terminal of one of the batteries (a vehicle panel earth can also be used).
2. Connect the green wire: Connect this green wire from the solenoid to the negative terminal of one of the batteries or to earth. A "clack" sound from the solenoid will confirm the batteries are linked.
3. No automatic disconnection: Once the green wire is connected, there will be no automatic disconnection. The solenoid will remain linked and draw energy.

The T-MAX Dual Battery System is designed for robust performance in demanding environments, providing reliable battery management and peace of mind for users of specialized vehicles.