🔧 The Problem : Why Reverse Current Can Be Dangerous

Reverse current happens when electricity flows the wrong way—back into your power source. In 24V systems, this can damage batteries, SMPS units, or cause dangerous heating. It’s common in circuits with multiple power sources like solar panels, battery backups, or motor drivers.

✅ The Solution : Use Schottky Diodes or P-Channel MOSFETs

To stop reverse current, insert a Schottky diode or P-Channel MOSFET in the supply line. Schottky diodes are easy to use and block reverse current, but they cause voltage drop. For better efficiency, a MOSFET with low RDS(on) is a smarter option, especially in 24V systems where even small losses matter.

🔌 Practical Example: 24V Battery Charging Setup

A hobbyist in Pune connected a 24V solar panel and grid power to charge his lithium battery. Without protection, current flowed from the grid to the solar panel at night—wasting energy. A P-Channel MOSFET, controlled with a simple gate resistor and pulldown, blocked the reverse flow effectively.

📐 Sample Calculation: Comparing Power Loss

Schottky Diode:

Voltage Drop = 0.5V at 2A →

Power Loss = 0.5 × 2 = 1W

MOSFET (RDS(on) = 0.05Ω):

P = I² × R = 2² × 0.05 = 0.2W — much cooler!

🛒 Product Suggestion :

Use P-Channel MOSFETs or Schottky Diodes, proudly Made in India, for your next protection circuit.

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