Sometimes. However, we maintain strict editorial independence. If a unit fails our surge or runtime tests, we report it regardless of how we acquired it. Many of the units we test are purchased with our own funds to ensure zero bias.

Manufacturers often calculate runtime based on “ideal” lab conditions. We factor in inverter efficiency loss (usually 15-20%) and real-world temperature variables. Our numbers are designed to be “worst-case scenario” so you aren’t left in the dark.

We use an oscilloscope to verify if a unit produces a Pure Sine Wave. We also monitor for voltage sags when heavy loads (like a refrigerator compressor) kick in to ensure the backup system provides stable, safe power for your electronics.

Absolutely. If you have a unique load—like a specific medical device or an older well pump—reach out via our Contact Page. We prioritize testing for high-demand devices that our readers rely on for safety.