Re: [RE-wrenches] Second Life Batteries

2017-10-05 Thread Dave Angelini Offgrid Solar
As has been said, and very well again by Larry, one needs to know exactly what type of Lion chemistry they are dealing with. Probably the best place to learn at this time is automotive electric car hobbyist or the offgrid Prismatic battery folks. It took me a year to learn enough about the LG

Re: [RE-wrenches] Second Life Batteries

2017-10-05 Thread Starlight Solar Power Systems
If you are going to play without knowledge, never have these battery cells near anything you are not willing to loose to fire. Worst case is you burn something that you did not intend to. Might be something cheap or your home and all your possessions or your eyes and skin. If that happens,

Re: [RE-wrenches] Second Life Batteries

2017-10-05 Thread Drake
Those are great arc-flash photos. Are we really getting into a serious risk of this sort of situation with a Li-ion battery? What really happens in a worst-case-scenario situation with them? How many people have blown themselves up to date? :-) Thanks, Drake At 01:16 PM 10/5/2017, you

[RE-wrenches] REC 275s

2017-10-05 Thread Marco Mangelsdorf
Aloha all, I'm on the hunt for ~ (150) REC 275 all-black (frame and backing) mods. If anyone knows of any available somewhere, please let me know off-line. Mahalo, marco ___ List sponsored by Redwood Alliance List Address:

Re: [RE-wrenches] Second Life Batteries

2017-10-05 Thread Dave Angelini Offgrid Solar
Youtube.com will make you a genius or a smoking idiot! Move forward with caution and remember all shortcuts lead to the Emergency Room. A good Google page for Arc flash!

Re: [RE-wrenches] Second Life Batteries

2017-10-05 Thread Starlight Solar Power Systems
Hi Drake, What chemistry of li-ion batteries are you talking about? Some, like LiFePO4, are far less prone to thermal runaway as they have superior thermal characteristics. Other chemistries should be avoided unless you have significant cell level monitoring and control. As with all

Re: [RE-wrenches] Second Life Batteries

2017-10-05 Thread Dave Angelini Offgrid Solar
I would tell them that there are different types of Li-ion and many are not made to be "repurposed" and should be re-cycled. Many are not safe in the home and I certainly would not want my name on anything crazy, like this sounds. To do this the BMS needs to be recalibrated for cycled bateries. I

Re: [RE-wrenches] Second Life Batteries

2017-10-05 Thread Darryl Thayer
Thermal Runaway is caused by part of a cell or cells being warmer than other cells as the cell warms is to voltage drops and the other cells power into that cell or can be caused by a failure of that cell usually a failure of a Cell results in a fuse being blown fusible link being blowing a good

[RE-wrenches] Second Life Batteries

2017-10-05 Thread Drake
Hello Wrenches, I've been contacted by a group who will be taking apart lithium ion battery packs that have been retired, finding the bad cells and recombining the remainder, then putting them in larger configurations for use in PV systems and electric vehicles. How can thermal runaway be