NABCEP Technical Sales Practice Exam

In a series connection of photovoltaic (PV) panels, connecting the positive terminal of one panel to the negative terminal of the next is the standard practice. This configuration is essential because it allows the voltages of the individual panels to add together, while the current remains the same across all panels in the series chain.

When panels are connected positive to negative, the total output voltage of the string is the sum of the voltages of the individual panels, which is crucial for achieving the desired voltage for the inverter or load that will use the energy generated. For example, if two panels each output 30 volts, connecting them in this way would yield a total output of 60 volts.

This setup optimally harnesses the power generated by each panel, ensuring that the system operates efficiently and that the overall voltage meets the needs of the system. In contrast, connections made positive to positive or negative to negative would not appropriately harness the electrical output and would instead short-circuit the panels, failing to produce any usable power.

The option discussing negative to positive increasing current is incorrect as series connections do not increase current; they increase voltage while maintaining the same level of current throughout the system. Understanding these fundamental principles of series connections is crucial for designing effective and