Schottky Diodes 30SQ050 – Pack of 5 for Efficient Reverse Current Protection
At night, your solar panel stops generating power — but it can start consuming it. Without a blocking diode, your battery may discharge back through the photovoltaic cells. 30SQ050 Schottky diodes prevent this energy loss, offering a voltage drop nearly three times lower than standard silicon diodes.
Note: This set includes 5 x 30SQ050 Schottky diodes. The price shown is for the complete pack.
Why choose this model? (Key benefits):
- Low voltage drop (~0.45V) — compared to 0.6–0.7V in standard silicon diodes, this means less heat generation and more power reaching your battery.
- 100% reverse discharge protection — prevents current from flowing back through panels during the night or in partial shading conditions.
- 30A rated current — easily handles installations with multiple panels connected in parallel, not just single-panel setups.
- Compatible with 12V, 24V, and 48V systems — a versatile solution for all common off-grid installations.
- Pack of 5 — ideal for complete installations or keeping spares on hand, offering excellent value per unit.
Details and Performance
Schottky technology replaces the traditional p-n junction with a metal-semiconductor barrier, which dramatically reduces forward voltage drop and virtually eliminates reverse recovery time. The result: less thermal dissipation at high currents and stable performance even under rapid load variations.
The TO-277A (SQ-package) features a flat contact surface for direct mounting onto a heatsink or metal chassis — essential when operating near the 30A limit. With a junction temperature rating of up to +150°C, these diodes provide a robust safety margin for installations exposed to direct sunlight.
| Parameter | Value / Detail |
|---|---|
| Model | 30SQ050 |
| Type | Schottky Diode – Blocking / Bypass |
| Average Rectified Current (Iav) | 30A |
| Maximum Repetitive Reverse Voltage (VRRM) | 50V |
| Forward Voltage Drop (Typical VF) | ~0.45 – 0.55V at 30A |
| Junction Temperature (Tj) | -55°C … +150°C |
| Package | TO-277A (SQ) |
| Solar System Compatibility | 12V / 24V / 48V |
| Battery Compatibility | AGM, GEL, Lead-acid |
| Quantity in pack | 5 pieces |
Package Contents
- 5 x Schottky Diode 30SQ050 (30A / 50V, TO-277A package)
Frequently Asked Questions
How many diodes are in the set and how is the price calculated?
The set includes 5 Schottky 30SQ050 diodes. The price displayed on the page covers all 5 pieces — it is not a per-unit price.
Can I use these diodes on a 48V solar system?
Yes, the 50V maximum reverse voltage allows for use in 12V, 24V, and 48V systems. As a general rule for maximum longevity, the operating voltage should not exceed 80% of the rated value.
Why choose Schottky over a standard silicon diode?
A standard silicon diode loses 0.6–0.7V when current passes through. The 30SQ050 Schottky diode loses only ~0.45V. At 30A, this difference saves several watts of energy every hour — a small saving per diode that becomes significant over the course of a year.
Is a heatsink mandatory?
At currents below 10–15A, the TO-277A package dissipates heat sufficiently without a heatsink. If your installation operates near 30A continuously, mounting on a heatsink or metal surface is recommended to keep the junction temperature within safe limits.
Can they be used in applications other than solar systems?
Yes. Anywhere you need rectification, reverse current blocking, or reverse polarity protection in DC circuits up to 50V and 30A — from chargers to industrial power supplies — the 30SQ050 diodes will perform reliably.
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