To determine the appropriate wattage of solar panels needed for a 60V battery system, several factors must be taken into account, 1. Each of these parameters plays a crucial role in calculating the. . A Solar Panel and Battery Sizing Calculator is an invaluable tool designed to help you determine the optimal size of solar panels and batteries required to meet your energy needs. By inputting specific details about your energy consumption, this calculator provides tailored insights into the solar. . At its core, the number of panels you need comes down to this simple calculation: Step 1: Calculate minimum solar array size Battery Capacity (kWh) ÷ Effective Sun Hours per Day = Minimum Solar Array Size (kW) Let's say you want to charge a 10 kWh solar battery. This free DIY solar calculator makes it simple to estimate the size of your solar array, the number of panels, battery storage, and the inverter. . 60W solar panels provide enough power to run a computer, a drone and other electronic devices.