When you want to connect two solar panels to one battery, you must first connect your battery to the charge controller. It is crucial that you do this step first. If you connect the solar panels to the charge controller, you might risk destroying the charge controller in the process.
When you connect your solar panels directly to your battery, you will damage the battery (lead-acid or lithium). You need a device that measures the state of charge of your battery and charges it accordingly, just like a car battery charger. The device we are going to use is called a charge controller.
It is not recommended to connect two different solar panels together. For more information, read my article about series and parallel solar panels or my guide about wiring mismatched solar panels. Can you connect 3 solar panels in series? Yes, if your charge controller has a high enough input voltage. Use the Voc of the panel.
First of all, you should know this: You cannot connect your solar panels directly to a battery. When you connect your solar panels directly to your battery, you will damage the battery (lead-acid or lithium). You need a device that measures the state of charge of your battery and charges it accordingly, just like a car battery charger.
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