Components for your PV (Solar Electric) System

Here is a brief description of the major components of a Solar Electric System. The components vary depending on whether batteries will be used in your system. And there are additional small components required for a complete installation that are not listed here.

written by Kristen Hagerty & James Cormican

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DC and AC Disconnects

Disconnects

No (NEC) code-compliant system can live without disconnects! The DC and AC disconnects of a PV system are manual switches that are capable of cutting off power to and from the inverter. Some inverters have disconnects with switches integrated into their structure. Other systems use an integrated power panel to support the inverter(s) and their associated disconnects in an organized arrangement. In still other cases, you will need to purchase the appropriate disconnects separately to work with an inverter. The disconnects are used by service personnel or authorized persons (fire/police/electric workers) to stop power from a renewable energy system reaching the inverter. (Don't forget that there are capacitors in most inverters that can hold a lethal charge for up to several minutes after incoming current is cut off! Consult the inverter manual for safe access times.) Disconnection prevents the current being produced from going beyond the disconnect point to a downed utility grid or damaged component. Homeowners or authorized personnel can use disconnects to de-energize a system for maintenance or service. Disconnects can range in cost from $100 to $300.

Miscellaneous Components

Cables, connectors, conduit and brackets -- oh my! This category includes everything you need to connect all the parts together safely and securely. As with most specialized technologies, there are many parts and tools involved in the proper installation of a safe and effective PV system. It is the responsibility of the installer to have a thorough understanding of them and of all the rules and regulations pertaining to solar electric installations (NEC Section 690 is key here). Gaining the knowledge needed to design and install a safe, efficient system not only ensures that your system will meet your needs effectively but also keeps you and your home safe and helps to promote the acceptance of renewable energy as a mainstream energy source.

Conclusion

We are thrilled that you are pursuing a PV system. Whether you choose to install the system on your own or whether you hire a professional installer, please be sure to adhere to National Electric Code for safety. Our PV installation Books, Classes & Webinars make great references as well.