Hello Jay and Larry. As I mentioned I have had experience with only 3 systems, I have another one coming up. The charge controller problem has occurred in all of my systems, But this is perhaps a misunderstanding on my part. I used manufactures data, trying to attain maximum life. As mentioned by others, I would not install a system without BMS built in.
I am interested in powerwall-2 AC as it seems to have some advantage in no export, and the glamour of LI. I have not been able to get one, except through giving the project to a competitor. Does anyone else make a similar product? And does anyone have information on the actual product as far as pass-through and turn-down for no export systems? Thanks to both of you and others for the information. On Thu, Oct 12, 2017 at 10:40 AM, Starlight Solar Power Systems < la...@starlightsolar.com> wrote: > 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 > > _______________________________________________ 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
