Pure Power Engineering

If you’re in a conversation about protective relaying, it’s likely that you will hear the term “SEL” about every third sentence. The third article in our relay series discusses what SEL stands for and the most common model numbers. Read more:

Intro to Relays #3 – What does SEL stand for? SEL is an acronym for Schweitzer Engineering Laboratories. They are the top manufacturer of utility grade relays and other protection, monitoring, & control devices. They are ubiquitous across the electrical industry. If you are using a relay in a solar or energy storage project, it’s probably a S...

Article 2 in our relay series talks about the ANSI/IEEE relay numbers used to design a relay's functionality. Read more to learn about the most commonly used functions in PV and energy storage systems.

ANSI/IEEE Relay Numbers This article will explain the basics of the relay numbers used to design a relay’s functionality.

Relays are an advanced area of electrical engineering and contracting so it can be intimidating for non-engineers, but it doesn’t have to be! This first article in a series of 3 articles will de-mystify relays for all the non-engineers in the solar and energy storage industries.

What are Relays, CTs & PTs?

The 3 mistakes covered in this blog have an effect on the long term operation, quality, and safety of the system but often are not the priority of developers. Hopefully by pointing them out, you can get these on your radar.

Top 3 Mistakes Developers Let Their Installers Make The 3 mistakes in this blog have an effect on the long term operation, quality, and safety of the system. Perhaps since they don’t have an immediate effect on project closeout, it's not on the list of priorities for developers. Hopefully by pointing them out, you can get these on your radar.

With 21 engineers between our NJ, CO, and CA offices, we have unmatched bandwidth to design your solar & energy storage projects fast.

Whether your preference is fast turnaround time or value-engineered quality, you will get them both from Pure Power Engineering.

The 2017 NEC's Rapid Shutdown requirements go into effect on January 1, 2019. Learn how to avoid additional costs in this article:

Urgent: Rapid Shutdown Increases Project Costs Starting Jan 1, 2019 Learn about the impacts of the 2017 NEC and how it will impact project costs in 2019.

The 2017 NEC dramatically changes the requirements for rapid shutdown of PV systems on buildings. Learn how this will impact you:

2017 NEC 690.12 Rapid Shutdown – Important Changes Learn more about the important changes to the 2017 NEC 690.12 Rapid Shutdown code.

Learn the real difference between the cost of aluminum and copper conductors in our latest blog post:

Reduce Costs with Aluminum Conductors on Solar Projects Learn how to reduce costs with aluminum conductors on solar projects.

Our first article NEC 690.12 Rapid Shutdown for String Inverters on Flat Roofs we explained the basics of implementing a rapid shutdown system using string inverters on a roof. In that article, we gave a simple example of a single array. What happens when there are two separate subarrays feeding the same inverter, or the subarrays are greater than 10' apart? [ 1,060 more word ]

http://purepower.com/nec-690-12-rapid-shutdown-length/

Rapid Shutdown – More on Conductor Length What happens when there are two separate subarrays feeding the same inverter? The code doesn't clearly state how to approach this scenario so Pure Power looks at the philosophy of the code and what it is trying to achieve, and develops an interpretation consistent with the intent of the code. Contin...

NEC 690.12 Rapid Shutdown for String Inverters on Flat Roofs

http://purepower.com/nec-690-12-rapid-shutdown-of-pv-systems-on-buildings/

NEC 690.12 Rapid Shutdown for String Inverters on Flat Roofs The 2014 National Electric Code added a new section of code 690.12 requiring "Rapid Shutdown of PV Systems on Buildings". Below is the first of 1 of 2 articles we put together to help you understand this code. Continue Reading →