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3–28V 15A Ideal Diode Module | Anti-Reverse Battery Charging Protection | Solar Energy Systems
3–28V 15A Ideal Diode Module | Anti-Reverse Battery Charging Protection | Solar Energy Systems
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3–28V 15A Ideal Diode Module — Anti-Reverse & Anti-Backflow Battery Charging Protection
An ideal diode module is a MOSFET-based circuit that replicates the one-way current flow of a diode — but with a dramatically lower voltage drop. A standard Schottky diode drops 0.3–0.5V at high current, wasting power as heat. This 3–28V 15A ideal diode module uses a low-RDS(on) MOSFET controlled by a dedicated ideal diode controller IC to achieve a forward voltage drop of just millivolts at full current — improving system efficiency, reducing heat generation, and eliminating the power loss that makes conventional diodes impractical in high-current solar and battery charging applications.
Specifications
| Input Voltage Range | 3V – 28V DC |
| Maximum Current | 15A continuous |
| Forward Voltage Drop | Millivolts (MOSFET-based, vs. 0.3–0.5V for Schottky) |
| Reverse Blocking | Yes — prevents reverse current flow |
| Anti-Backflow | Yes — prevents battery discharging back through solar panel at night |
| Response Time | Fast (MOSFET switching, microsecond response) |
| Application | Solar charging, battery protection, DC power OR-ing |
| Origin | Mainland China |
Ideal Diode vs. Schottky Diode — Why It Matters at 15A
| Property | Ideal Diode Module (this product) | Schottky Diode (e.g., MBR1545) |
|---|---|---|
| Forward voltage drop at 15A | ~10–50mV | ~450–600mV |
| Power loss at 15A | 0.15–0.75W | 6.75–9W |
| Heat generation | Minimal | Significant (heatsink required) |
| Efficiency impact | Negligible | Measurable (especially in 12V systems) |
| Reverse blocking | Yes (MOSFET gate control) | Yes (diode junction) |
| Complexity | Module (plug-and-play) | Single component |
In a 12V / 15A solar charging system, a Schottky diode wastes up to 9W as heat — equivalent to 75% of a 12W solar panel’s output. The ideal diode module reduces this loss to under 1W.
Key Features
- ✅ Ultra-low forward voltage drop — millivolt-level drop vs. 0.3–0.5V for Schottky diodes at the same current
- ✅ 15A continuous current — handles high-current solar panel and battery charging applications
- ✅ 3–28V input range — covers 6V, 12V, and 24V battery and solar systems
- ✅ Anti-reverse protection — prevents reverse current from damaging solar panels or power sources
- ✅ Anti-backflow protection — prevents battery discharging back through solar panel at night or during cloud cover
- ✅ Fast MOSFET switching — microsecond response to reverse current conditions
- ✅ No heatsink required — minimal power dissipation eliminates the heatsink needed for equivalent Schottky diodes
Common Applications
- Solar panel anti-backflow — prevents battery discharging through the solar panel at night
- Battery charging protection — prevents reverse current from damaging the charging source
- Power supply OR-ing — connect multiple power supplies in parallel without cross-conduction
- Battery backup switching — seamless switchover from mains to battery without voltage drop
- Reverse polarity protection — protects downstream circuits from accidental reverse connection
- Wind turbine charge controller — prevents reverse current during low-wind conditions
- Multi-source energy harvesting — combine solar, wind, and battery sources without cross-discharge
Wiring Guide
- Connect the positive terminal of your power source (solar panel, charger) to the module INPUT+.
- Connect INPUT− to the negative terminal of your power source.
- Connect OUTPUT+ to the positive terminal of your battery or load.
- Connect OUTPUT− to the negative terminal of your battery or load.
- Current flows freely from input to output; reverse current is blocked automatically.
Frequently Asked Questions
Q: Can I use this instead of a Schottky diode in my solar charge controller?
A: Yes. The ideal diode module is a direct functional replacement for the anti-backflow Schottky diode in solar charge controllers, with significantly lower power loss.
Q: Does this module work with lithium battery systems?
A: Yes. The 3–28V input range covers 1S–6S lithium battery systems (3.7V–22.2V nominal). Ensure the maximum voltage does not exceed 28V.
Q: Can I connect two modules in parallel for 30A?
A: Yes. Connect two modules in parallel (input to input, output to output) to double the current capacity to 30A.
Package Contents
- 1× 3–28V 15A Ideal Diode Module
