Solar Panel StringThe “solar panel string” is the most basic and important concept in solar panel wiring. This is simply several PV modules wired in series or parallel.Series ConnectionSolar panels feature positive and negative terminals. Wiring solar panels in series means wiring the positive terminal of a module to the negative. Solar Panel StringThe “solar panel string” is the most basic and important concept in solar panel wiring. This is simply several PV modules wired in series or parallel.Series ConnectionSolar panels feature positive and negative terminals. Wiring solar panels in series means wiring the positive terminal of a module to the negative of the following, and so on for the whole string. This wiring type increases the output voltage, which can be measured at the available terminals.Parallel ConnectionWiring solar panels in parallel increases the output current, while keeping the voltage constant. The output current is the sum of all currents generated by the modules in the string. Solar panels wired in parallel also have to meet NEC regulations. This includes conductor size and overcurrent devices. This is calculated by oversizing the Short Circuit Current (Isc) by 125%, considering the number of modules in the system, as specified in the NEC 690.8(A)(1) and NE. There are two types of inverters used in PV systems: microinverters and string inverters. Both feature MC4 connectors to improve compatibility. In this section, we will explain each of them and their details.Planning the solar array configuration will help you ensure the right voltage/current output for your PV system. In this section, we explain what these items are and their importance.Up to this point, you learned about the key concepts and planning aspects to consider before wiring solar panels. Now, in this section, we provide you with a step-by-step guide on how to wire solar panels.Now, it is important to learn some tips to wire solar panels like a professional, below we provide a list of important considerations.