The charger in question is a 30 watt USB-C charger produced by Voltme. It cost [Brian] just $10, as prices of GaN hardware have come down significantly as economies of scale have kicked in.

Charging speed is determined by charger wattage, cable quality, battery health, temperature, source, and phone usage. Different charging standards range from 5W to 240W, varying for USB PD ...

Learn about the typical solar panel wattages used in rooftop installations and how to estimate the ideal system capacity for your home. Leonardo David is a writer and energy consultant who has ...

By learning your home’s wattage needs, you can calculate how much energy you expect to use in a month. From there, you can focus on reducing the amount of energy you use to cut down your energy ...

William Watts is MarketWatch markets editor. In addition to managing markets coverage, he writes about stocks, bonds, currencies and commodities, including oil. He also writes about global macro ...