The truth is, as long as you are using 12V solar panels, you can use any style of solar panels to charge a 12V battery; however, it is not quite as simple as connecting your solar panels directly to your battery.
Based on the earlier calculation, a 100 watt panel will produce an average of about 30 amp-hours per day (based on an average sunny day). This means you would need three 100 watt solar panels or one 300 watt panel to fully recharge your battery on the average day. How long will it take to charge a battery?
In addition to solar panels, you can also charge your 12V battery through grid power and alternators. But the other two ways will not be as economical as solar panels which offer access to clean and free solar power. What are amp hours? Deep cycle batteries have a specific amp hour rating.
For a 12V lithium-ion battery, a 150-watt solar panel can charge the device (100 Ah capacity) in 10 hours. But if you use lead acid battery, it will take a 100-watt panel. To find the right panel wattage to charge a 12V battery, you must answer these two questions: What is your battery capacity in amperage? How quickly do you want to charge it?
Attach the positive cable to the positive panel adapter cable and vice-versa. Then plug the positive solar input cable into the positive solar PV terminal, tighten it and connect the negative in the same manner. Step 2: Now, connect the charge controller to the battery with appropriate wires.
After all, clouds like to crash the party uninvited, reducing the panel’s power output. So, for a 50Ah 12V battery, a solar panel around 144 watts (120W + 20%) would be your solar sweet spot. Keep that formula in your back pocket, and you’ll be ready to soak up the sun like a pro!
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