Find the ideal DC input voltage (12V, 24V, or 48V) for your inverter setup based on load power, current limits, and efficiency to ensure optimal wiring and system safety. Formula used: DC Current = Power / (Voltage × Efficiency). Solar panels generate direct current (DC) electricity, but your home runs on alternating current (AC). The inverter handles this crucial conversion, and its size directly impacts your system's efficiency and safety. A properly sized solar inverter typically lasts 10‑15 years, though premium or. Determining what size inverter do I need depends on several critical factors related to your power consumption, device requirements, and system design. In this article, we guide you through the different inverter sizes. Additionally, you'll learn what appliances you can power and how you can select the right inverter size according to your. AC Voltage - Many applications will have a range of Input AC Voltage. In Europe, it's usually 200-240 VAC. AC Amperage - Input. You can use the following formula to determine the size: Volts * Amps = watts or Watts / Volts = amps 1250-watt example: 1250 / 120 Vac = 10. 41 amps AC (typical number found on equipment) or 1250 / 12 Vdc = 104.