You need a 210 watt solar panel to fully charge a 12v 60ah lithium (LiFePO4) battery from 100% depth of discharge in 5 peak sun hours using a PWM charge controller. Read the below post to find out how fast you can charge your battery. Battery capacity in watt-hours (Wh), 2. Charging efficiency and losses, 3. Sunlight hours available, 4. Desired charging time. Related Post: Guide: Maximum Charging Current & Voltage For 12v. . To find the right battery size, convert watt-hours to amp-hours (Ah) using the formula: Battery Ah = (Total Wh ÷ Battery Voltage) Now consider depth of discharge (DoD) —most lithium batteries can safely discharge up to 80-90%, while AGM is about 50%. ✅ So, a 150Ah lithium battery or 250Ah AGM. . 60W solar panels provide enough power to run a computer, a drone and other electronic devices. They can be used to charge batteries too, but how many and what size? Before you start charging, better be sure the panel can handle it. It. . To figure out how long it takes to charge a solar battery, you start by knowing its capacity in watt-hours (Wh) and the total output of your solar panels in watts (W). Basically, you just divide the battery capacity by the product of your panel's wattage and the number of effective sunlight hours. . How many watts of solar energy can a 60A battery produce? How many watts of solar energy can a 60A battery produce? 1. A 60A battery can produce a maximum of 720 watts of solar energy if charging at a full 12V voltage, 2.