20A dual battery solar charge controller / regulator for 12V / 24V batteries
20A dual battery solar charge controller / regulator for 12V / 24V batteries
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20A Dual Battery Solar Charge Controller
Model: DB2024 | 12V/24V Auto-Detect | PWM Technology
The Photonic Universe 20A Dual Battery Solar Charge Controller (Model DB2024) is an advanced PWM regulator designed for efficient and intelligent power management in 12V or 24V solar systems. This controller is ideal for simultaneously charging and protecting two independent battery banks, such as engine and leisure batteries in caravans, camper vans, or boats, ensuring reliable power for your mobile or off-grid applications.
Utilising Pulse Width Modulation (PWM) technology, the DB2024 optimises battery charging, enhances charge acceptance, and helps to prolong battery lifespan, even recovering some lost capacity over time. It automatically detects system voltage and intelligently manages power distribution between two batteries, or directs all current to a single battery if only one is connected.
KEY BENEFIT: Seamlessly charges and protects two independent 12V or 24V battery banks simultaneously, with configurable charging priority.
Key Features
| ▶ Dual Battery Management — Charges two separate 12V/24V battery banks (e.g., engine and leisure) simultaneously. |
| ▶ PWM Charging Technology — Optimises battery charging, improves acceptance, and extends battery lifespan. |
| ▶ Configurable Priority — Set initial charging priority (e.g., 80% to engine, 20% to leisure) for tailored power distribution. |
| ▶ Single Battery Operation — Automatically detects and charges a single connected battery with 100% current if only one is present. |
| ▶ Wide Solar Input — Supports solar panel arrays up to 320W for 12V systems and 640W for 24V systems. |
| ▶ Battery Type Compatibility — Suitable for sealed, gel, and flooded lead-acid battery types. |
| ▶ Integrated Temperature Sensor — Adjusts charging parameters based on ambient temperature for optimal performance. |
| ▶ LED Indicators — Clear visual feedback on the state of charge for easy monitoring. |
Technical Specifications
| Parameter | Value |
|---|---|
| Rated Charging Current: | 20A |
| System Voltage: | 12V / 24V Auto-Detect |
| Max. Solar Panel Input (12V): | 320W |
| Max. Solar Panel Input (24V): | 640W |
| Battery Types: | Sealed, Gel, Flooded |
| Terminals: | 3 pairs (Input, Battery 1, Battery 2) |
| Temperature Compensation: | -30mV/°C/12V |
| Self-Consumption: | 4mA (night), 10mA (charging) |
| Working Temperature: | -35°C to +55°C |
| Wire Compatibility: | Up to 4.0mm² |
| Dimensions: | 15.5 x 7.6 x 4.0 cm |
| Weight: | 230 g |
Charging & Battery Modes
The Photonic Universe DB2024 controller offers flexible charging modes to suit various dual battery setups. It intelligently monitors the voltage levels of both connected batteries and distributes charging current accordingly. Users can set an initial charging priority, for example, allocating 80% of the current to a primary (engine) battery and 20% to a secondary (leisure) battery.
Once one battery reaches full charge, the controller automatically diverts all available solar power to the other battery, ensuring no energy is wasted and both batteries are optimally maintained. This smart management system ensures both battery banks are kept in peak condition, ready for use.
For enhanced monitoring, an optional remote LCD meter (RJ-45 connection) is available separately, providing detailed real-time data on charging parameters and battery status. An external remote temperature sensor is also recommended for installations where the controller and batteries are in different temperature environments.
Typical Applications
| Application | Description |
|---|---|
| Caravans & Camper Vans | Manages engine and leisure batteries, ensuring both are charged and maintained for extended trips. |
| Boats & Yachts | Ideal for marine environments to keep starter and service batteries charged from solar panels. |
| Off-Grid Systems | Provides reliable dual battery charging for remote cabins, sheds, or small independent power setups. |
| Mobile Power Solutions | Suitable for any application requiring two separate battery banks to be charged and protected by solar. |
Built-In Protection Functions
The Photonic Universe DB2024 is equipped with multiple electronic protection features to safeguard your solar system and batteries. These include protection against reverse current flow from the battery back to the solar panel at night, prevention of overcharging which can damage batteries, short circuit protection, and reverse polarity protection for safe connections.
Common Questions
Can this controller work with only one battery?
Yes, absolutely. The DB2024 automatically detects if only one battery is connected and directs 100% of the charging current to it. You can add a second battery later without needing a new controller.
What types of batteries are compatible?
The controller is compatible with common lead-acid battery types, including sealed, gel, and flooded batteries.
Is a remote meter included with the DB2024?
No, the remote LCD meter is an optional accessory and is sold separately. The controller features an RJ-45 socket for connecting such a meter for detailed monitoring.
Do both batteries need to be the same voltage?
Yes, both batteries connected to the controller should have the same nominal voltage (either 12V or 24V, as automatically detected by the controller). They can, however, have different capacities.
Installation Notes
- Always connect batteries to the controller before connecting solar panels.
- Ensure correct polarity for all connections (solar input, Battery 1, Battery 2).
- Mount the controller in a well-ventilated area, away from direct sunlight and moisture.
- Use appropriate wire gauges for your solar array and battery connections to minimise voltage drop.
- For optimal temperature compensation, ensure the controller is installed near the batteries or use an optional external temperature sensor if batteries are located far away.
- Refer to the detailed instruction manual included with the product for comprehensive installation guidance.
Before You Buy
- Verify your total solar panel wattage does not exceed 320W for 12V systems or 640W for 24V systems.
- Confirm your battery system voltage (12V or 24V) matches the controller's auto-detection capability.
- Ensure your battery types (sealed, gel, or flooded) are compatible with this PWM controller.
- Consider if an optional remote LCD meter or external temperature sensor would enhance your system monitoring.
- Always consult a qualified installer if you are unsure about any aspect of solar system design or electrical connections.
Please verify all specifications and compatibility requirements before purchase. This product is covered by a 1-year manufacturer's warranty.
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