Comparison · Power supplies

12 V 100 W power supply or 24 V 100 W transformer

Two models side by side: measurements taken by the author in their reviews, and their conclusions. The better value in each row is highlighted.

In brief: Based on review measurements: Test current: 12 V 100 W power supply (9 A vs. 2); Temperature rise: 24 V 100 W transformer (55 °C vs. 128).

Model	12 V 100 W power supply2026Read review →	24 V 100 W transformer2016Read review →
Voltage, V	12	24
Current, A	8.33	4
Power, W	100	100
Test current, A	9	2
Temperature rise, °C	128	55
Review conclusion	With reservations	Recommended

Only in one review: In test 100 W (24 V 100 W transformer); Ripple 400 mV (12 V 100 W power supply); Efficiency 89 % (12 V 100 W power supply); Protection 9.3 A (12 V 100 W power supply); Price 13 $ (24 V 100 W transformer).

12 V 100 W power supply: Efficiency is about 89%, but the output rectifier transistor overheats under heavy load.

24 V 100 W transformer: The transformer works normally and reaches at most 52–55°C at full power.

Figures were taken from the review text and checked against the quoted passages. Measurement conditions differ between reviews, so read the reviews yourself before buying. Prices at the time of review.