Hello Darryl, Quote "You must be careful of LI because if you are floating, the voltage drops so little your CC will not necessarily pick-up.”
We have sold hundreds of Li-ion batteries over the last 4 years. No one has had a problem with a PV solar charge controller or battery charger providing current when a load is applied. If the battery voltage is at equilibrium with the charger, float mode and current basically zero, the slightest load will be directed to the charge source as it attempts to maintain voltage. Hey Jay, We sell Relion with cylindrical cells and prismatic cells from Elite Power Solutions (GBS) and LiFeBlue Battery. We have never had a cell failure with any battery yet so as for cell quality, all brands are working well. The problems we have had are always with the EMS systems. My thoughts comparing the two battery types are one type has fewer points of failure. In a 100AH 12 volt pack using cylindrical cells, you have many dozens of batteries and connections compared to 4 to 16 prismatic cells. I know Tesla cars have worked extremely well with 7000+ cylindrical cells but he has spent millions making it work. In the Li battery market we are involved with, I’m not so sure the manufacturers have provided the same level of QC. Larry Crutcher Starlight Solar Power Systems On Oct 7, 2017, at 8:05 PM, Darryl Thayer <darylsol...@gmail.com> wrote: I have only limited experience with Lithium batteries. But in that experience, a module of small cylindrical cells will have a higher power, faster charge, and discharge. For the same chemistry, the prism cells will have a little higher energy density. For long cycle life and slow aging, the differences in battery additives meaning the manufacturer are paramount. In using Li-ion there are a few tricks. The voltage is very stable, so you can not use voltage for the state of charge. For LA you will float 13.4 forever, then when you draw power, the voltage drops. even at low draw, the voltage drops to the 12.6 range. You must be careful of LI because if you are floating, the voltage drops so little your CC will not necessarily pick-up. Some manufacturers give you instruction via mod bus or some form of communication. So ask your CC supplier and your battery people good luck some do not even understand their own equipment. On Sat, Oct 7, 2017 at 10:16 AM, jay <jay.pe...@gmail.com> wrote: > To follow along with the lithium questions, > > I’m wondering what thoughts/information people have on prismatic vs > cylindrical lithium family batteries? > > My questions are quality,cycle life, pros/cons,recycling? > > Thanks > > jay _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
