Current #SolarMOOC Lesson
Below you will find the most current #SolarMOOC Lesson. To view older Newsletters, visit the Newsletter Archive page. To read more about our #SolarMOOC Subject Matter Experts, visit the Guest Lecturer Directory. Go to the #SolarMOOC Lecture Schedule for a complete linked list of all past and future lectures. If you are not a current #SolarMOOC Participant, ENROLL Today and receive special #SolarMOOC Topic updates, micro course announcements, and links to additional resources.
Batteries Exposed!: Possibilities of Medium Scale Storage in Off-Grid Design
Last week’s #SolarMOOC lecture, Batteries Exposed!, was a romp through the land of medium scale storage design for off-grid living. It was an awesome session with Grigar, the off-grid guru, in which we explored the possibilities for various types of battery bank designs that accommodate high amp hour storage demands.
Kenny showed us a bit about how we can use 2V cells to design large capacity battery banks (for example, a 2000 amp hour battery bank), so we can have less parallel strings along with high storage functionality ( more than 1600 amp hours at 48 volts).
Kenny also discussed different technologies on the market, and the reasons why although some newer technologies is supposed to be safer and longer lasting, Kenny is still in love with the Lead Acid L16 oldie.
Fun Fact (watch the lecture video to gain more insight):
What is the maximum number of strings in parallel for battery bank design? Definitely four, but three is better than four, and two is even better than three and you could even have one. There are certain drawbacks to having one: If you have two strings and a string fails, you still have the storage of one string. One drawback to having multiple strings is the potential of uneven charging and discharging.
Remember always- it is very very important that battery cables be the same length to establish even charging cycles through the bank. You can even use connection plates rather than cables (shown in video).
Watch the video below, and scroll down for more key lecture material and some links and resources to expound on the subject.
#SolarMOOCers: Please read the articles linked below and submit questions to the comments section of the Newsletter. We will do our best to answer them in a timely manner.
We are very excited to announce the availability of upcoming class being taught by SolPowerPeople’s newest Master Solar Instructor and COO, the solar pioneer- Janet Lee Hughes! SolPowerPeople and ONTILITY team up to bring you this special offer:
40 Hours Advanced NABCEP credit in one week! Just in time for the next NABCEP certification exam deadline in January. Don’t miss it!
- Monday, December 2 – Friday, December 6
- 8:00 AM – 5:00 PM
- Class location: ONTILTY Training Center, 3403 N. Sam Houston Parkway, Suite 300, Houston, TX 77086
- Price: $1,295
- Register Today!
This ONTILITY Solar Electric Training course is a professional PV installer training course designed to help you qualify to take the NABCEP PV Installation Professional Certification Exam.
Off Grid Hardware- Kenny Grigar is co-owner of this business out of Taos, New Mexico. They sell everything from axes to solar panels, and are absolutely worth checking out. You could also go there and visit in person- their address can be found here.
Contact Kenny- directly at kenny @ offgridhardware .com
Battery operation and Instruction manual (8A and 8G)- We discussed briefly during the lecture that this type of battery could be a good selection for a remote 40W load (a water pump for example). This is just one example of an installation manual, and they are incredible resources. While you are learning how each solar PV component works, take a look for manuals like this one. They are incredible tools for helping clarify how things work. Although they can be intimidating at first, diligent study will help it come together- and most often, you can contact the manufacturer or distributor and ask questions of what you read in the manual.
Off Grid Batteries- 30 Years of Lessons Learned (Allan Sindelar) – this Home Power Article offers a great basic description of the various types of batteries used for off grid design, as well as some basic design considerations and things to know about batteries before you get started ( like string sizing and temperature effects).
Choosing the Best Batteries (Christopher LaForge) – This Home Power article (which includes a focus on 2009 batteries),offers a lot of explanation on important characteristics that should define battery selection.
NEC2014: New Requirements for Solar PV Systems
Thursday October 10th, 2013
We had record breaking attendance for the #SolarMOOC lecture: NEC2014 – New Requirements for Solar PV Systems presented by Todd Fries, Marketing Manager at HellermannTyton.
This lecture was packed with visuals and precise examples on how things will be changing with the way PV systems are labeled. It is essential to know the right way to label PV system in order to pass inspection and allow for system commissioning. This lecture highlights which labels are changing, and offers solutions for the tough spots like rooftop labeling for conductors under the roof.
2014NEC Labeling Requirements Poster- click this link to request a free poster from HellermannTyton that illustrates labeling requirements that will be established in the 2014 NEC. If you would like to request other materials or multiple copies for your class, reach out them over the phone: 800-537-1512 or 414-355-1130
NEC2014 White Paper - a White Paper on PV Labeling: NEC2014 Section 690 Solar Photovoltaic Systems
For those who are interested, check out the promotional Labeling Kit available: Labeling Kits