Comparison · Power supplies

5 V 20 A power supply (100 W) or 48 V 2.1 A, 100 W power supply

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: 5 V 20 A power supply (100 W) (24 A vs. 1.7); Ripple: 48 V 2.1 A, 100 W power supply (50 mV vs. 100); Temperature rise: 48 V 2.1 A, 100 W power supply (64 °C vs. 135).

Model	5 V 20 A power supply (100 W)2026Read review →	48 V 2.1 A, 100 W power supply2026Read review →
Voltage, V	5	48
Current, A	20	2.1
Power, W	100	100
Test current, A	24	1.7
Ripple, mV	100	50
Protection, A	24	1.7
Temperature rise, °C	135	64
Review conclusion	With reservations	With reservations

Only in one review: In test 77 W (48 V 2.1 A, 100 W power supply); Under load 4.93 V (5 V 20 A power supply (100 W)); Efficiency 72 % (5 V 20 A power supply (100 W)).

5 V 20 A power supply (100 W): Well assembled, but effectively a 75 W unit; the output inductor overheats at full power.

48 V 2.1 A, 100 W power supply: Well built, cool-running, and low-ripple, but protection limits output to about 77 W.

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.