IGBT vs MOSFET Inverters: What the Difference Means for You
When researching inverters, you will often see specifications mentioning IGBT or MOSFET technology. These are the semiconductor switches at the heart of every inverter — and the type used significantly affects how the inverter performs, how reliable it is, and how long it lasts.
What Are IGBT and MOSFET?
Both IGBT (Insulated Gate Bipolar Transistor) and MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) are power semiconductor devices that act as electronic switches in the inverter’s power circuit. They rapidly switch DC power from the battery to create the AC output that your appliances use.
MOSFET — ideal for lower power
MOSFETs switch very fast with low on-resistance, making them highly efficient at lower voltages and currents. They are the preferred choice for smaller inverters, where fast switching means low losses. At higher voltages and currents, though, they become less efficient and their cost advantage disappears.
IGBT — the choice for larger inverters
IGBTs handle high voltages and large currents more efficiently. They are the standard in industrial drives, UPS systems and inverters above 1 kVA, and they absorb overloads and motor surge currents better — critical for refrigerators, pumps and air conditioners. They are also more robust and longer-lasting.
What to Look for When Buying
For home inverters of 1 kVA and above, look specifically for IGBT-based designs — they will handle your real-world loads, including motor surges, more reliably. For small UPS units below 1 kVA for computers or routers, MOSFET-based designs are fine. Most quality Indian brands now specify which technology they use — if a manufacturer does not mention it, ask. The technology used is a strong indicator of the inverter’s quality tier.
Heavy-Duty and Industrial UPS
For heavy-duty or industrial UPS applications — running machinery, elevators, medical equipment, or data centres — IGBT technology is mandatory. The ability to handle large, variable loads without stressing the power electronics is what separates professional-grade inverters from consumer-grade ones.
Rule of thumb: below 1 kVA, MOSFET is fine. At 1 kVA and above — and anywhere reliability is critical — choose IGBT.
Kunwer Sachdev
Founder of Su-Kam and Kunwwer.ai, and mentor at Su-vastika and several other companies — the “Inverter Man of India.” Read his story →
Disclaimer: This article is written by Kunwer Sachdev, mentor of Su-vastika. Kunwer Sachdev is no longer associated with Su-Kam Power Systems Ltd. in any capacity — neither as a director, shareholder, employee, nor advisor. He has no involvement in Su-Kam’s current operations, products, services, or warranties, and anyone dealing with the Su-Kam brand or purchasing its products does so entirely at their own discretion.
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