Should I connect solar panels in series if space is limited?

When to Use Series Connection

When space is limited, connecting solar panels in series is a viable option. This configuration increases the system’s voltage, which can be beneficial if your inverter or charge controller is limited to a specific voltage range. For example, let’s say you have six 12V solar panels, and you want to connect them in series to reach a total voltage of 72V, which is a common input voltage for many inverters.

Benefits and Drawbacks of Series Connection

While series connection can increase voltage, it also decreases system efficiency. As you add more panels in series, the total current output decreases. This is because the current is divided among the panels in the string, resulting in a lower overall current. For instance, if you have six panels in series, each panel will only produce 1/6th of the current it would if it were connected alone. This reduced current output can lead to increased power loss and reduced system performance.

Calculating Series Connection Efficiency

To calculate the efficiency of a series connection, you’ll need to consider the number of panels, their voltage, and current output. A general formula to estimate efficiency is: efficiency = (number of panels in series) / (number of panels in series + 1). Using our previous example with six panels in series, the estimated efficiency would be 6 / (6 + 1) = 85.7%. This means that your system would only be able to produce 85.7% of the maximum possible power output. By understanding the benefits and drawbacks of series connection, you can make informed decisions about your solar panel configuration.