Comparison · Converters

Universal USB-powered voltage converter or QBW018A0B

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: Price: Universal USB-powered voltage converter (4.23 $ vs. 5.47).

Model	Universal USB-powered voltage converter2019Read review →	QBW018A0B2018Read review →
Voltage, V	30	12
Current, A	2	18
Price, $	4.23	5.47
Review conclusion	With reservations	With reservations

Only in one review: Power 15 W (Universal USB-powered voltage converter); In test 14 W (Universal USB-powered voltage converter); Test current 2.3 A (Universal USB-powered voltage converter); Ripple 100 mV (QBW018A0B); Temperature rise 111 °C (QBW018A0B); Weight 52 g (Universal USB-powered voltage converter).

Universal USB-powered voltage converter: An interesting, versatile converter, but its readings are inaccurate and current adjustment can malfunction.

QBW018A0B: It runs hot at full load and needs cooling; the author advises against drawing more than 8 A for long without forced cooling.

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.