Reverse Protection for 48V Batteries – Simple Fixes That Save Circuits
⚠️ The Problem :
Accidentally connecting a 48V battery in reverse can instantly damage your electronics. This is especially risky in solar inverters, e-bikes, and DIY power systems. Without reverse polarity protection, your expensive components could go up in smoke.
🔧 The Solution :
The best way to protect your 48V system is to use a P-channel MOSFET or Schottky diode in the input path. These components act as electronic gates, blocking current if the polarity is wrong—saving your circuit from disaster.
💡 Practical Example :
Say you’re designing a 48V Li-ion battery-powered inverter. During installation, someone connects the terminals backward. If there’s no protection, the MOSFETs, control ICs, and capacitors may get damaged. Add a P-channel MOSFET in reverse-polarity protection mode, and the circuit simply blocks the wrong voltage without blowing anything up.
🧮 Sample Calculation :
Assume your system draws 5A. Choose a P-MOSFET with R<sub>DS(on)</sub> = 20 mΩ.
Power loss = I² × R = 5² × 0.02 = 0.5W — very manageable and efficient.
🛠️ Product Suggestion :
Get MOSFETs or diodes built for reverse protection here:
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