Power Converters: what Claude and GPT would buy

Two AI models chose on their own, with no web access. Nobody tested these products: this is what each one says, and how to check it.

They disagree: Claude chooses LiteFuze and GPT chooses BESTEK

In Electronics, Claude and GPT choose the same brand in 21 of 42 categories.

Claude Opus 5.5 · October 27, 2026

LiteFuze (brand)

It sells transformer-based step-up and step-down voltage converters in a wide range of wattages for running appliances on foreign mains voltage.

Not for: Travelers whose devices are already rated 100-240V, who only need a plug adapter.

GPT 6.1 Sol · November 10, 2026

BESTEK Travel Voltage Converter (line)

Steps down overseas voltage for compatible US electronics, with multiple outlets and USB ports for convenient travel charging.

Not for: Hair dryers, heating appliances, or devices exceeding its wattage limit.

Simran (brand)

It is a long-established maker of step-up and step-down voltage transformers.

Not for: Travelers wanting a pocket-sized converter, since these transformers are heavy.

Check the device label first. If the device reads 100-240V, no converter is needed, only a plug adapter. Most phone, laptop and camera chargers are dual voltage.
Wattage headroom. Rate the converter at 2-3x the device's wattage for motors, compressors and pumps. About 1.5x is enough for resistive loads. Startup surge on motor loads exceeds their running watts.
Transformer vs solid-state. Use solid-state 'travel' converters only for simple heating appliances. Electronics and motors need a true transformer. Solid-state converters output a chopped waveform that can damage electronics.
Frequency. Voltage converters do not change between 50 Hz and 60 Hz. Clocks, turntables and some motors run at the wrong speed or overheat on the other frequency.
Grounding. Choose a converter with a grounded three-prong output if the appliance has a ground pin. It preserves the appliance's shock protection.

Shops seen in search results on November 5, 2026. A shop missing here may sell it too. Nothing was checked by a person.

Running hair dryers or other high-wattage heating appliances through small travel converters for long periods
Converters rated exactly at the appliance's wattage
Using a converter on a device that is already dual voltage

Is a plug adapter a voltage converter?

No. A plug adapter only changes the plug shape and does not change the voltage.