A 48V inverter converts DC battery power to AC electricity. To determine runtime at 1kW (1000W): For a 200Ah battery bank: Total DC power = 48V × 200Ah = 9,600Wh Usable AC power (90% efficiency) = 9,600 × 0. 9 = 8,640Wh Runtime at 1kW = 8,640 ÷ 1,000 = 8. Battery Chemistry & Discharge. In this guide, we'll take a deep dive into what a 48V inverter is, how it compares to systems like a 24 volt dc inverter, and how to choose the best option based on your unique energy needs. Use this mode when battery capacity is given in voltage and amp-hours, such as 12V 100Ah. Disclaimer: While we strive to ensure the accuracy of our calculator tools, we cannot be held. Easily calculate battery backup time for UPS, inverter, or solar systems with our free online Battery Backup Calculator. Fast, accurate, and user-friendly. Describe what you want changed, added, or compared. What should be different? Your original calculator remains unchanged.