Hi Dave, Howie, Et al, With one brand of Li batteries we sell (EPS), if any part of the BMS system fails, you can turn the battery power on manually and continue to function until the repair is made. All the BMS components are external so it is very serviceable by tech or user. Having a spare part is not very expensive. We have customers operating these systems for 6 years now and I can attest to the success of it. (Other Li battery systems may have similar function)
Concerning moving to 48V, at any time the (EPS) Li battery can be reconfigured for 48V provided you have 4 (or 8, 12, etc) battery packs. Converting from 2S2P to 4S1P is simple. (sorry, ranting ahead) You can also add additional capacity at any time. Imagine in 10 years you need more energy storage. With LA, you need to start over with all new. Not so with the EPS system. Just buy more cells and BMS and reconfigure the CPU. The oldest, lower capacity cells are still usable. It not until the minimum V of one cell triggers a shutdown before you have recharged the bank that you need to replace cell(s). Most don’t know that a Li battery can be fully recharged with about 40% less PV solar power. Why? Because they absorb current up to about 98% SoC. Absorb time is about 10 minutes if you want push them to full. No hours in absorb and float, required each day by LA, wasting much of the PV energy that was paid for. Another benefit is many LA battery systems experience deficit charges in the winter because there are not enough sun-hours. We all know that this quickly diminishes the life of a LA battery. When using engine power to charge on those rainy days, the EPS battery system can be fully charged in under one hour from ANY SoC! Pontificating over for now. I hope this is helpful to you Howie. Larry Crutcher Starlight Solar Power Systems On Sep 26, 2019, at 3:58 PM, Dave Angelini Offgrid Solar <offgridso...@sti.net> wrote: My 2 cents are each client is different and if they have been fine on that one set of batteries then do what is in their interest. An inverter is easily replaced. I might also suggest to stay with the FLA and avoid possible issues with LFP. No matter how good they are in many cases, they still have electronics in them that can fail and cause a new way to lose power offgrid. In my case and quite a few of my offgrid clients I want a complete back-up of the battery if LFP is used. That is what is so nice about having multiple battery systems. One can fail and each has it's own BMS. A spare LFP system can also sit for a year and be fine as long as it gets some exercise. Good Luck Howie! All good on those two Schneider xwp and gateway/insight2 systems? Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ <http://members.sti.net/offgridsolar/> e-mail offgridso...@sti.net <mailto:offgridso...@sti.net> text 209 813 0060 On Thu, 26 Sep 2019 17:17:47 -0400, Howie Michaelson <howie.michael...@gmail.com> wrote: > I get what you are saying Jerry, but this client ( a retiring teacher in a > very rural, low wage school district, sadly) has lived very lightly off-grid > (1kW solar, 24v Rolls KS21s original batteries) for 18 years years and has no > pressing need to upgrade his VFX3524 inverter. I'd rather find a good 24volt > option to compare a straight KS21 replacement to. I know the inverter could > crap out at any time, but if it ain't broke... > Howie > > On Thu, Sep 26, 2019 at 5:03 PM Jerry Shafer <jerrysgarag...@gmail.com > <mailto:jerrysgarag...@gmail.com>> wrote: > Dollars and sence, drop the 24 volt, BPI is a great battery. Once l show my > customers all the benefits of a 48 volt upgrade it wins every time. I am not > talking about busses, RV's and one night stands l am talking about off grid > homes. > > On Thu, Sep 26, 2019, 1:53 PM Howie Michaelson <howie.michael...@gmail.com > <mailto:howie.michael...@gmail.com>> wrote: > Hi all, > I've been using BlueIon batteries recently both on- and off-grid, and really > like them so far, although I have limited time on them so not a ton of > experience yet. I am wondering what folks are liking for 24 v LiFePO4 > battery options. I have 24 volt off-grid clients who are not ready to swap > out to 48v, but might be interested in Lithium batteries. TIA, > Howie > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > <mailto:RE-wrenches@lists.re-wrenches.org> > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > <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 > <http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html> > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm <http://www.re-wrenches.org/etiquette.htm> > > Check out or update participant bios: > www.members.re-wrenches.org <http://www.members.re-wrenches.org/> > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > <mailto:RE-wrenches@lists.re-wrenches.org> > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > <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 > <http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html> > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm <http://www.re-wrenches.org/etiquette.htm> > > Check out or update participant bios: > www.members.re-wrenches.org <http://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
_______________________________________________ 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
