Solar
NABCEP
Design and Installation
Certification Prep
Utility-Scale
String Sizing Class
1h 42m of video
lectures
Last updated 01/2025
About this course
This free course is a series of videos showing you how to do the math to figure out how many PV modules you can connect in series. In order to do string sizing, you have to know the high and low temperatures of the location where you are going to put the solar system. In a colder place, the voltage will get higher than a warmer place. This class will show you how it is done. This is a free class that has older videos, but string sizing never changes.
Disclaimer: There is math here, which is many simple steps, however some people have a math phobia, and if you have a math phobia, do not blame this course. Better yet, take it one simple step at a time and you will discover that math is fun!
Disclaimer: There is math here, which is many simple steps, however some people have a math phobia, and if you have a math phobia, do not blame this course. Better yet, take it one simple step at a time and you will discover that math is fun!
Learning Objectives
- Determine the most PV modules that can be connected in series
- Calculate the least number of PV modules that can go in series
Course outline
4 modules
1:42 hours
of video lectures
Welcome • 2 assignments
Orientation Materials
Welcome • 2 assignments
Orientation Materials
This is a free course. We take pride in our free courses, but keep in mind that this is only a taste of what we do in a full HeatSpring course. You can get started immediately after you enroll.
- Connect with your instructor Sean on LinkedIn
- Welcome to the course!
Module 1 • 6 assignments
String Sizing
Module 1 • 6 assignments
String Sizing
- String Sizing - Voltage Temperature Calculations Part 1 (17:46 minutes)
- String Sizing - Voltage Temperature Calculations Part 2 (18:12 minutes)
- String Sizing - Voltage Temperature Calculations Part 3 (26:29 minutes)
- String Sizing - Voltage Temperature Calculations Part 4 (16:28 minutes)
- String Sizing - Voltage Temperature Calculations Part 5 (23:24 minutes)
- String Sizing Formula
Module 2 • 2 assignments
Practice
Module 2 • 2 assignments
Practice
- String Sizing Quiz
- String Sizing Quiz - 10 Questions with Answer and Detailed Explanations (.pdf)
Conclusion • 2 assignments
Feedback and Additional Resources
Conclusion • 2 assignments
Feedback and Additional Resources
This is our last module but you still have access to the all of course materials so keep working and you'll be able to complete the course at your own pace. Enjoy the course and keep in touch!
- Feedback: 2-minute Exit Survey
- Certificate of Completion: Request a Certificate (members only)
Author
Sean White
2014 IREC Trainer of the Year, HeatSpring / White House Energy Inc. / Sean White Solar / Norcal Solar
Sean White was the 2014 Interstate Renewable Energy Council Trainer of the Year. He is an IREC Certified Solar PV Master Trainer and has authored several books on solar. He contributed to the development of the NABCEP PV Installation Professional Job Task Analysis and has been a member of the NABCEP PV Installation Professional Technical Committee. Sean is a...
Frequently asked questions
Full FAQHow does this course work?
This is a free course. Enroll today and get access to all of the materials instantly. Pre-order courses are available on launch date. This course is self-paced and you can set your own schedule to complete the materials. You can begin the lecture videos and other course materials as soon as you enroll.
How long do I have access to the materials?
For free courses there is no guarantee for how long the course materials will be available.
Is there a certificate of completion?
Certificates of completion are only provided to HeatSpring Membership subscribers. This course has not been approved by any credentialing organizations (NABCEP, AIA, USGBC etc) for Continuing Education Credits (CEUs). This course is for self education purposes only and completion does not indicate a level of professional expertise or credential.
Can I register multiple people?
Yes, this is a free course so you can share this page with other people from your team.