How do I calculate approximate runtime?

For a practical AC runtime estimate, use: Estimated Runtime (hours) = Battery Capacity (Wh) × 0.90 ÷ Appliance Power (W). UDPOWER uses approximately 90% conversion efficiency as a useful planning value.

Example: a 1,000Wh battery running a steady 100W AC load is approximately 1,000 × 0.90 ÷ 100 = 9 hours. Actual runtime varies with load behavior, temperature, inverter consumption, battery condition, and operating mode.