Solar Backflow Prevention Ideal Diode Module 20A 50A 70A DC 4–90V
Solar Backflow Prevention Ideal Diode Module 20A 50A 70A DC 4–90V
High-Current Ideal Diode Module for Solar & Battery Systems
The Gaqqee Solar Backflow Prevention Diode Module is an advanced ideal diode rectifier designed for solar panels, battery backup systems, UPS units, drones, and dual-power-supply applications. Available in 20A, 50A, and 70A variants across wide voltage ranges (DC 3.5–60V or DC 4–90V), this module replaces traditional Schottky or PN junction diodes with an ultra-low on-resistance MOSFET-based solution — delivering minimal voltage drop, low heat generation, and built-in reverse polarity protection. Made in Mainland China.
Key Features
- Wide Voltage & Current Support: DC 3.5–60V (20A) or DC 4–90V (20A / 50A / 70A) — select the model that fits your system.
- Ultra-Low On-Resistance: As low as 0.75mΩ (70A model), drastically reducing conduction losses compared to conventional diodes.
- Backflow & Reverse Polarity Protection: Automatically blocks reverse current and will not burn out if connected in reverse — protecting your circuits from damage.
- Low Quiescent Current: Only 300μA standby draw — ideal for always-on solar and battery applications.
- Wide Operating Temperature: Rated from -40°C to +125°C for reliable performance in demanding environments.
- Switching Frequency up to 150Hz: Suitable for DC solar charging and battery management; not intended for AC rectification.
- Simple Drop-In Wiring: Directly replaces reverse-connection protection diodes with straightforward terminal connections.
- Expandable: Multiple modules can be connected in parallel to increase total current capacity or add additional channels.
Full Specifications
| Parameter | Value |
|---|---|
| Operating Voltage | DC 3.5–60V / DC 4–90V (Optional) |
| Operating Current Options | 20A, 50A, 70A |
| Quiescent Current | 300μA |
| On-Resistance (3.5–60V, 20A) | 4.6mΩ |
| On-Resistance (4–90V, 20A) | 3.6mΩ |
| On-Resistance (4–90V, 50A) | 1.5mΩ |
| On-Resistance (4–90V, 70A) | 0.75mΩ |
| Switching Frequency | Up to 150Hz |
| Reverse Polarity Protection | Yes |
| Operating Temperature | -40°C to +125°C |
| Package | TQFP Module |
Typical Applications
- Solar panel backflow and back-feed protection
- Dual or redundant power supply parallel configurations
- UPS (Uninterruptible Power Supply) systems
- Primary and secondary battery parallel connection
- Hot-swap battery replacement in drones and portable electronics
- Reverse polarity protection for DC power modules and electronic device inputs
Important Usage Notes
- For DC applications only; switching frequency must not exceed 150Hz — not suitable for AC rectification.
- Enhanced heat dissipation (larger heatsink or forced-air cooling) is required at higher operating currents (above 15A for 20A models; above 20–30A for 50A/70A models).
- Install TVS diodes and electrolytic capacitors at input/output to absorb surge voltages in high-voltage or inductive-load environments.
- Do not use a multimeter's diode or resistance range to measure internal resistance — calculate from measured voltage drop and current instead.
- The negative terminal of the main current circuit may bypass the module, but the module's negative terminal must remain connected.
What's in the Box
- Diode Module × 1 (model of your choice)
- Heat-shrink tubing × 1
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Frequently Asked Questions
Q: What is the difference between the DC 3.5–60V and DC 4–90V solar backflow prevention diode module versions?
A: The DC 3.5–60V version is optimized for lower-voltage solar and battery systems (e.g., 12V–48V systems), while the DC 4–90V version supports higher-voltage setups up to 90V, making it suitable for larger solar arrays or higher-voltage battery banks. Both versions are available in 20A; the 50A and 70A high-current options are only available in the 4–90V variant.
Q: Does this ideal diode module require a heatsink?
A: For currents below 15A (20A model) or below 20–30A (50A/70A models), the module can typically operate without additional cooling. However, for higher sustained currents, a heatsink or forced-air cooling is strongly recommended to maintain safe operating temperatures and ensure long-term reliability.
Q: Can I connect multiple diode modules in parallel to handle more current?
A: Yes. Multiple Gaqqee ideal diode modules can be connected in parallel to increase total current handling capacity or to add redundant channels — making this solution highly scalable for larger solar, UPS, or battery management systems.
Q: Is this solar backflow prevention module suitable for AC rectification?
A: No. This module is designed for DC applications only. The maximum switching frequency is 150Hz, and it is not suitable for AC rectification tasks. Always ensure it is used within its specified DC voltage and current ratings.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.