Which component of a line interactive UPS increases its battery life?

Question

Options

• ADual mains input
• BVoltage regulating transformer
• CLow impedance DC disconnect
• DHigh impedance battery charge circuit

• A
  9% (5)
• B
  84% (46)
• C
  4% (2)
• D
  4% (2)

Explanation

In a line interactive UPS, the voltage regulating transformer (an autotransformer) corrects minor voltage sags and surges by adjusting output voltage without switching to battery power. Because the battery is only engaged during actual outages or severe disturbances rather than every fluctuation, it cycles far less often, directly extending its usable life.

Option A (dual mains input) refers to redundant power feeds found in high-availability infrastructure, not a standard UPS component tied to battery longevity. Option C (low impedance DC disconnect) describes a switching characteristic of the battery circuit that affects efficiency and safety, not how often the battery is drawn upon. Option D (high impedance battery charge circuit) inverts the logic: a high-impedance charger would slow charging, and neither charger impedance nor charging speed is the primary driver of battery lifespan in a line interactive design.

Memory tip: Line interactive = the transformer stays in-line and handles the small stuff, so the battery sits on the sideline and lasts longer.

No community discussion yet for this question.