The TommaTech 45A 12/24 2USB PWM Charge Controller is a practical battery-charging and DC-load-management solution for 12 V and 24 V standalone solar systems. The exact current model listed by CW Enerji corresponds to TT4524AU in the official AU Series technical sheet and user manual.
The controller automatically identifies a 12 V or 24 V battery system and provides 45 A rated charging and discharging current at 55°C. Its 50 V maximum PV open-circuit-voltage limit is suited to correctly matched lower-voltage PV arrays. Three-stage intelligent PWM charging uses Bulk, Boost/Equalize and Float stages, with selectable profiles for sealed, gel and flooded lead-acid batteries.
A dynamic LCD displays operating data and system status. Multiple load-control modes support timer, light-controlled and manual operation for applications such as solar lighting and traffic signalling. Energy statistics and battery-temperature compensation improve day-to-day system management, while two USB outlets provide a combined 5 V DC / 2.4 A supply for compatible electronic devices.
The common-positive architecture, IP30 enclosure and published connection limits must be considered during design. Large starting-current loads and external inverters should be connected directly to the battery through the correct protective arrangement rather than to the controller's load terminals.
Key Features
- 45 A rated charge and discharge current at 55°C
- Automatic 12 V or 24 V system recognition
- Three-stage intelligent PWM charging
- Sealed, gel and flooded battery profiles
- Dynamic LCD with operating and status information
- Multiple programmable load-control modes
- Energy statistics function
- Battery-temperature compensation
- Dual USB output rated 5 V DC / 2.4 A total
- PV and battery reverse-polarity protection under the manual's stated conditions
- Battery overvoltage, overdischarge and overtemperature protection
- Load overload and short-circuit protection
- Continuous full-load operation stated from -25 to 55°C
- Terminals stated as UL and VDE certified in the official user manual
Recommended Applications
- Solar home systems
- Solar street lights and garden lights
- Traffic signals and roadside signs
- Battery-backed DC lighting
- Remote monitoring and security equipment
- Small agricultural and livestock installations
- Compact 12 V or 24 V independent PV systems
- Timed or dusk-to-dawn DC-load applications
Selection Guidance
- Use TT4524AU only with a 12 V or 24 V nominal battery system.
- Keep the PV array's maximum cold-condition open-circuit voltage below 50 V.
- Confirm that both charge current and controlled load current remain within the 45 A rating.
- The official source does not publish a maximum PV-array power for TT4524AU; determine the array using current, voltage, battery charging requirements and professional system design rather than publishing an assumed wattage.
- Select the correct sealed, gel or flooded charging profile before operation.
- Confirm common-positive grounding compatibility throughout the system.
- Use the controller's load terminals only for suitable controlled DC loads. Connect an external inverter or another large starting-current load to the battery through its own correctly rated protection.
Charging-voltage note: The official AU Series manual states that the charging and load-voltage parameters shown above are for a 12 V system at 25°C and are doubled for a 24 V system.
Protection and Operating Functions
- PV reverse polarity: the manual states that the PV input can be reversed without controller damage when the battery is correctly connected.
- Battery reverse polarity: the manual states that the battery can be reversed without controller damage when the PV input is not connected.
- Battery overvoltage: charging stops at the overvoltage-disconnect threshold.
- Battery overdischarge: load discharging stops at the low-voltage-disconnect threshold and recovers at the reconnect threshold.
- Battery and controller overheating: output is disabled at the manual's published high-temperature thresholds and restored after cooling.
- Load overload and short circuit: the controller disables the load output according to the fault level and recovery logic described in the user manual.
- Remote temperature sensing: an optional remote sensor can measure battery temperature for compensation; if it is unplugged, the controller uses a fixed battery-temperature value of 25°C.
Load-Control Capability
The AU Series controller provides light-controlled operation, timed operation after sunset or before sunrise, test mode and manual mode. This makes TT4524AU particularly useful where the controller must manage a compatible DC load as well as charge the battery. The required mode and timing must be configured during commissioning.
Important Installation Notes
- Connect the battery first so the controller recognises the nominal system voltage.
- Keep the battery fuse close to the battery; the official manual suggests within 150 mm.
- Follow the official connection sequence and leave the fuse or breaker open during wiring.
- The dual USB ports are rated 5 V DC / 2.4 A total and include short-circuit protection.
- Confirm that PV voltage is higher than battery voltage during operation but never exceeds the controller's maximum PV open-circuit-voltage limit.
- Install the IP30 controller in a clean, dry, ventilated and protected location.
