Pure Sine Wave vs Modified Sine Wave Inverter: Which Is Safe for Fans, Fridges and TVs?
Nov 5, 2026 . Alobari Team
Quick answer: A pure sine wave inverter produces a smooth AC waveform like grid power, so ceiling fans run quietly, fridge compressors start reliably and laptops, TVs and LED drivers stay safe. A modified sine wave inverter produces a stepped waveform that is cheaper to make but can make fans hum and heat up, reduce motor life and upset sensitive electronics. For a home in Bangladesh, choose pure sine wave.
What is the difference?
Grid electricity in Bangladesh is a 220–240V, 50Hz sine wave. A pure sine wave inverter recreates that shape. A modified sine wave inverter approximates it with square steps, adding harmonics that devices turn into heat and noise.
Device compatibility
| Device | Pure sine | Modified sine |
|---|---|---|
| Ceiling fan | Quiet, cool | Hum, extra heat |
| Refrigerator | Reliable start | May struggle, shorter life |
| Laptop / phone charger | Safe | Usually works, adapters may run hot |
| LED TV, router, CCTV | Safe | Possible interference or faults |
| Water pump / motor | Good (within peak rating) | Hotter, less efficient |
Continuous vs peak power
Every inverter has two ratings. Continuous is what it can run all the time; peak covers start-up surges for a moment. Size by continuous power with 20–30% headroom:
- Corechain CJ-1000: 500W continuous / 1000W peak — lights, fans, TV, router, CCTV
- Corechain CJ-1600: 800W / 1600W — above plus a small fridge
- Corechain CJ-3000: 1500W / 3000W — medium fridge, small pump, several appliances
Note: model names like “CJ-1600” refer to peak power — always check the continuous rating.
Battery and cable tips
- At 12V, a 1,500W load draws over 125A — use short, thick cables and a fuse.
- Match battery size to backup time: usable Wh × 0.9 ÷ load watts ≈ hours.
- Keep the inverter in a ventilated place; summer heat lowers output.
Frequently asked questions
Can a 500W inverter run a fridge?
Usually not reliably — compressor start-up surges are high. Use an 800W–1500W continuous pure sine wave inverter.
Why does my fan hum on my old IPS?
Most likely it has modified sine wave output. A pure sine wave inverter fixes the hum.
বাংলায় সংক্ষেপে
পিওর সাইন ওয়েভ ইনভার্টার গ্রিডের মতো পরিষ্কার বিদ্যুৎ দেয় — ফ্যান শব্দহীন, ফ্রিজ নিরাপদ, ইলেকট্রনিক্স সুরক্ষিত। মডিফায়েড সাইন সস্তা হলেও ফ্যান গরম ও শব্দ করে। ইনভার্টার কেনার সময় Continuous পাওয়ার দেখে লোডের চেয়ে ২০–৩০% বড় নিন।
Need help choosing?
Call or WhatsApp Alobari at +880 1611-846093 with your panel size, battery and the appliances you want to run — we will recommend the right setup. Cash on delivery and delivery to all 64 districts of Bangladesh.