To summarize, the charge controller is the manager of the battery power. Here are other important features of solar charge controllers: – Regulating the power sent from the solar array to the battery according to the battery state of charge. This extends battery life.
Thus, in case of a solar array of a higher voltage (by using a 24V panel or by connecting two 12V solar panels in series), the solar charge controller is a must. Here are listed the main functions of the charge controller in a solar panels system: – Taking care that the battery bank is not getting overcharged during the day.
You don't need a charge controller for a 7-watt solar panel. These panels are specifically designed for low-voltage trickle charging, which means you don't have to worry about regulating the electrical flow. Looking for a comprehensive guide on solar charge controllers?
Accordingly, it's recommended to use a charge controller rated at 70 amps to avoid overloading and possible malfunction. Apart from the above-mentioned information, there are a few other important things you need to know about solar charge controllers if you're planning to use one.
An MPPT solar charge regulator forces a solar panel to operate at a voltage close to its maximum power point. Another benefit of an MPPT controller is that it reduces the wire size (gauge) needed for the wires connecting the solar array to the controller.
If you connect a 24V solar panel (where maximum voltage can be as high as up to 36V), the non-MPPT (also known as ‘standard’) charge controller brings the solar generated voltage down to the 12V battery charging voltage, which is 13.5-14.5V.
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