Comparison · Converters

5 V UPS or Martek power, 48 V → ±12 V, 630 mA

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: Temperature rise: 5 V UPS (78 °C vs. 85); Price: Martek power, 48 V → ±12 V, 630 mA (0.9 $ vs. 1.17).

Model	5 V UPS2019Read review →	Martek power, 48 V → ±12 V, 630 mA2019Read review →
Voltage, V	5	12
Temperature rise, °C	78	85
Price, $	1.17	0.9
Review conclusion	Not recommended	Recommended

Only in one review: Current 2 A (5 V UPS); Test current 2.8 A (5 V UPS); Ripple 100 mV (5 V UPS); Weight 16 g (Martek power, 48 V → ±12 V, 630 mA).

5 V UPS: It is cheap and handles the rated current, but the author was disappointed by the large voltage drop when switching to battery.

Martek power, 48 V → ±12 V, 630 mA: It delivers up to 800 mA, but voltages shift substantially under unbalanced load; overall, the author is satisfied.

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.