Eletechsup Products Can Be Used in Solar Charging
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Solar charging systems convert energy from photovoltaic (PV) panels into electrical energy that can be stored in rechargeable batteries and used to power electronic devices, lighting, sensors, and off-grid equipment.
Eletechsup offers a range of solar charging controllers, MPPT charging modules, battery charger boards, and DC-DC power modules. These products can support compact solar-powered devices, battery charging projects, solar street lights, and backup power applications.
The appropriate product depends on the solar panel voltage, battery chemistry, battery voltage, required charging current, and the power consumption of the connected equipment.
2. Solar Battery Charging
One of the main applications for Eletechsup charging modules is charging rechargeable batteries from solar panels.
A typical system consists of:
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A photovoltaic solar panel.
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An Eletechsup solar charging module.
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A compatible rechargeable battery.
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A battery protection circuit where required.
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A load powered by the battery.
During daylight, the solar panel provides energy to the charging module, which manages the charging process according to its design and settings. The battery can then supply power when sunlight is insufficient or unavailable.
Potential applications include portable solar equipment, small off-grid devices, battery-powered sensors, and standalone electronic products.
Recommended product: SD30CRMA
The Eletechsup SD30CRMA is an MPPT charging module designed for compatible lithium-ion, LiFePO4, and lithium-titanate battery configurations.
The product listing specifies a maximum charging current of 1 A, adjustable output voltage, and different input configurations for solar panels with nominal 9 V, 12 V, or 18 V ratings.
Potential applications include:
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Small solar battery chargers.
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Portable electronic equipment.
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Battery backup projects.
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Low-power off-grid devices.
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Solar-powered monitoring equipment.
3. MPPT Solar Charging
Maximum Power Point Tracking (MPPT) is a technique that adjusts the operating point of a photovoltaic panel to extract available power more effectively under changing sunlight and load conditions.
An MPPT charging module can be useful when the solar panel voltage differs from the battery charging voltage and the module's input and output specifications are compatible with the application.
Recommended product: SD29AJTC
The Eletechsup SD29AJTC is a step-down MPPT charging module for supported rechargeable battery configurations.
Potential applications include:
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DIY MPPT solar charging projects.
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Charging compatible lithium-ion batteries.
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Charging compatible LiFePO4 battery packs.
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Battery backup systems.
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Portable industrial and electronic equipment.
The module requires the input voltage to exceed the output voltage by the margin specified in its documentation. Engineers must also configure the MPPT operating point and charging voltage for the selected panel and battery.
4. Solar Street Lighting
Solar street lights commonly combine a solar panel, rechargeable battery, LED light source, and automatic day/night switching.
Eletechsup solar charging controllers can help combine battery charging with automatic lighting control in suitable low-voltage lighting designs.
Recommended product: SD1512TA
The SD1512TA is a compact solar charging controller listed with 3–18 V input compatibility and selectable 0.5 A, 1 A, and 2 A versions.
The product description includes automatic day/night switching for compatible LED lighting systems. It detects changes in the voltage generated by the solar panel to determine whether it is daytime or nighttime.
Potential applications include:
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Small solar LED street lights.
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Garden and pathway lighting.
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Outdoor decorative lighting.
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Compact solar-powered lamps.
The product listing states that the lithium battery requires appropriate protection. Its output-current and battery-protection limitations must be considered when designing the final circuit.
5. Solar Charging for 12 V Lead-Acid Batteries
Some small solar systems use 12 V lead-acid batteries to supply backup power, lighting, or auxiliary equipment.
Recommended product: SDLA12TA
The Eletechsup SDLA12TA is listed as an MPPT solar charging controller for compatible 12 V lead-acid batteries.
Published specifications include:
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Maximum charging current: 3 A.
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Overcharge voltage: 14.8 V.
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Float charging voltage: 13.55 V.
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Solar panel input intended for the specified 12 V panel configuration.
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Overcurrent and battery-overvoltage protection features.
Potential applications include:
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Small solar battery charging systems.
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Solar-powered auxiliary lighting.
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Low-power backup power projects.
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Suitable standalone battery chargers.
The specified charging voltages are product-specific and may not suit every lead-acid battery. Verify the battery manufacturer's charging requirements and the controller's input limits before use.
6. Solar Charging for Small Electronic Devices
Small solar panels can power low-energy devices when combined with an appropriate battery charger and DC-DC converter.
Potential applications include:
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Environmental monitoring sensors.
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Portable electronic instruments.
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Small wireless communication devices.
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Battery-powered embedded controllers.
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Solar-powered data collection equipment.
The Eletechsup DD05CRTA, for example, combines a low-voltage lithium battery charging circuit with a 5 V boost output. Its product listing specifies an input range of 0.9–5 V and a maximum battery charging current of 1 A.
For solar use, the panel must provide a suitable voltage and sufficient current under actual sunlight conditions. The available 5 V output power depends on input power, conversion efficiency, and operating conditions.
7. Product Selection Guide
| Solar charging requirement | Product to evaluate | Main application |
|---|---|---|
| Small lithium battery charging with MPPT | SD30CRMA | Portable and low-power solar devices |
| Adjustable step-down MPPT charging | SD29AJTC | Compatible lithium-based battery systems |
| Automatic day/night lighting control | SD1512TA | Small solar LED lighting |
| 12 V lead-acid battery charging | SDLA12TA | Suitable backup and auxiliary power systems |
| Low-voltage charging with 5 V boost output | DD05CRTA | Compact solar-powered electronics |
These modules serve different purposes and are not interchangeable. Battery chemistry, cell count, charging voltage, input range, current limits, and protection requirements must all be checked before selecting a product.
8. Design Considerations for Solar Charging
When designing a solar charging circuit, engineers should consider the following:
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Solar panel specifications: Check the panel's open-circuit voltage, operating voltage, current, and available power.
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Battery chemistry: Select a charger designed for the specific battery chemistry and series-cell configuration.
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Charging voltage: Set or verify the correct charging voltage for the battery.
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Charging current: Ensure the current is within both the module's rating and the battery manufacturer's recommended limits.
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MPPT configuration: Follow the module's instructions for selecting or adjusting the operating point.
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Battery protection: Use an appropriate protection circuit where required, especially for lithium-based battery packs.
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Reverse current and fault protection: Confirm the module's capabilities rather than assuming all protection functions are present.
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Thermal and outdoor conditions: Provide appropriate ventilation, enclosure protection, and wiring for the intended environment.
A compact charging board should not be assumed to support high-power solar arrays or large battery banks simply because the battery has a high capacity rating. The panel voltage, charging current, power dissipation, and thermal limits remain critical.
9. Benefits for OEM Manufacturers and System Integrators
Eletechsup solar charging modules may help developers build compact charging and power-management functions into their products.
Potential advantages include:
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Small form factors for embedded applications.
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Options for different battery chemistries and voltage ranges.
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MPPT charging options on selected models.
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Automatic day/night switching on selected lighting controllers.
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Integration possibilities for portable electronics and backup power equipment.
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Multiple module choices for different charging requirements.
The actual performance and suitability depend on the selected model and the overall system design.
10. Conclusion
Solar charging is an important application for compact power-management electronics. Different projects require different solutions, ranging from low-current lithium battery charging to 12 V lead-acid charging and automatic solar lighting.
Eletechsup products such as the SD30CRMA, SD29AJTC, SD1512TA, SDLA12TA, and DD05CRTA provide options for selected solar charging and battery-powered applications.
By matching the charging module to the solar panel, battery chemistry, voltage, current, and load requirements, engineers ca