- Rule of Thumb: The inverter's rated power (kW) should align with the battery's capacity (kWh). - Oversizing the battery can lead to underutilization, while undersizing may limit performance. It manages the power flow from these sources, ensuring that energy is used efficiently, whether it's being consumed immediately, stored for. An inverter is the heart of any solar and storage system, converting the direct current (DC) power from your batteries into alternating current (AC) to power your property. - A. However, one key factor that determines the overall performance of a power backup system is the compatibility between the inverter and the lithium battery. This compatibility is often overlooked, but it is crucial for achieving optimal performance, safety, and the longevity of both components.