Multiple battery banks work well as long as you are consuming. When charging the charge parameters change. I’m running 8 Interstate L16’s, 1 Fortress e-flex, And 3 Simpliphi 3.8. With big switches between them. I was using all three but changing charge parameters on My two controllers and inverter got to be too much trouble. I ran all with lithium settings but I’m retiring the L16s and putting in a second eFlex. 2 eFlex or 3 Simpliphis do a great job replacing the 8. The 3 simpliphis will be leaving for their summer home at a fishing club. Hi
John B On Thu, Apr 6, 2023 at 11:50 AM Dave Angelini Offgrid Solar via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote: > And the next step for hi reliability offgrid is to have both types of > battery in there own independent inverter power systems. Just switch the DC > bus from one power system or the other. I like the LFP just turned off > sitting as a spare power system. You can rotate or do a monthly test like > it is a genset. > > This is also a good way to use up the old flooded and retire it when it > becomes useless and ready to recycle. Some LFP manufactures do provide a > spare BMS but probably better to just have an extra battery at the offgrid > home. > > > > *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 <offgridso...@sti.net> > text 209 813 0060* > > > On 2023-04-05 6:30 pm, Scot Arey via RE-wrenches wrote: > > Just attended the NABCEP conference last week and took in CEU classes from > Rolls and Midnite on battery charging and design. Just awesome classes and > I walked away thinking the FLA were kind of like my old 7.3 Powerstroke > diesel…I could work on them and could see when issues were developing. The > lithium batteries are kind of like my 6.7 PSD. Great power, fast but when > something happens with a BMS…no idea except to go to the manufacturer. > > > > Just wanted to share this after reading your awesome post. > > > > Scot > > > > *From:* RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> *On > Behalf Of *Tump via RE-wrenches > *Sent:* Wednesday, April 5, 2023 6:24 PM > *To:* RE-wrenches <re-wrenches@lists.re-wrenches.org> > *Cc:* Tump <t...@swnl.net> > *Subject:* Re: [RE-wrenches] RE-wrenches] replace part of rolls battery > bank > > > > I would suggest that adding additional batteries to increase battery > voltages is fine 48 to 54V or what ever, I too have used this many times on > very remote sites. Please also increase your inverters hi voltage cut out > settings, as this can be a real bummer having the system shut down in full > sun. > > Another thing; IF you have battery strings, cables of equal length from > each string should be connected to a buss bar then buss bar to inverter or > inverters, this will reduce wiring headaches, voltage drop as well as > providing equal charging to all strings. (depending on internal resistance). > > I would also suggest fewer batteries of bigger cells. My preference is 2 > volt cells, less holes to water, less copper interconnects. Yeah there > heavy but for hi charging & discharging, a large battery is always my > choice. OR the Surrette 6CS25P has been the MOST reliable battery Surrette > has put out. After almost 30 + years of installing their batteries this one > has been the best. They do have a EX series 2 Volt cell that has the same > plate thickness as the 6 CS but I have had issues w/ them. IF you are using > the EX 2 volt check the polarity PRIOR to installing them & mark the > positive side. I have had the plastic covers installed incorrectly and it > plays havoc on your install. > > Yep LEADITE I am, refractometer and a DVOM and I have a client that can > spot problems way before things become critical. AND that Surrette > warrantee Pit BULL Mr. Higgins & your client will be very happy when Steve > OKs a replacement because you have recorded your Spg readings. > > My $.02 TUMP > > > > On Apr 5, 2023, at 5:26 PM, greg egan via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > > > > Danny, My experience is if you are careful and use *equal length > conductors* for all 3 strings you can get good results. The main problem > I have with 3 strings of 6 V cells @ 48 vdc is leaving the customer with 72 > cells to check and fill. That's a lot of work if you don't have a watering > system. > > I totally get why you'd want to give them 2 strings in case they lose a > battery or 2. Most of my off grid customers live quite a ways from the > battery store and it's not uncommon for it to take a month to get > replacements - during the best of times. > > Another option I've done is give them a string of 25 - 2V cells for a 48V > system. You just set the charging parameters accordingly and go. That > way if they lose a cell or two, the remaining battery bank should be able > to keep them limping along until the replacement battery(s) show up. Need > to check and *make sure* your charge controller and inverter can charge > at the slightly higher V but usually that's not a problem. > > Best, > > Greg Egan > Remote Power Inc. > > g...@remotepowerinc.com > > > > > Message: 1 > > Date: Tue, 4 Apr 2023 20:45:44 +0000 > > From: Daniel Young <da...@sesre.com> <da...@sesre.com> > > To: "offgridso...@sti.net" <offgridso...@sti.net> <offgridso...@sti.net> > <offgridso...@sti.net>, RE-wrenches > > <re-wrenches@lists.re-wrenches.org> <re-wrenches@lists.re-wrenches.org> > > Subject: Re: [RE-wrenches] replace part of rolls battery bank > > Message-ID: > > > <bl1pr12mb5921cde5991f65fa842bc82cbb...@bl1pr12mb5921.namprd12.prod.outlook.com> > > <bl1pr12mb5921cde5991f65fa842bc82cbb...@bl1pr12mb5921.namprd12.prod.outlook.com> > > > > Content-Type: text/plain; charset="utf-8" > > > > Thanks all for the advice. I figured it was not worth trying on a different > battery brand. I honestly needed to be able to tell them I researched it and > asked my peers. > > > > The client really uses the 3 x strings they have and did not really want to > go down to 3. They are currently choosing to get the two Rolls under the > prorated warranty, and hopes to get another 2 useful years out of the bank > before planning to replace. > > > > Already prepared him on the cost of the equivalent Li+ at todays prices. So > he knows roughly where he is heading. > > > > Side note: I am in the camp of trying for 2 x strings when possible (agree > that 3 x strings is the absolute limit, and not the best option), simply > because if a single cell goes bad, I don?t want a client with essentially > nothing available until we can get a replacement and get on site. With 2 > strings, they can make due at least. That?ll go out the window with Lithium > though. Looking at Fortress Power for the next battery bank for this client. > But we will see what changes in the market by the time it?s needed. > > > > With Regards, > > -- > > > > Danny Young > > NABCEP PV Installation Professional #031508-90 > > Engineering Team Lead > > Solar Energy Solutions > > Lexington | Louisville | Bloomington | Cincinnati | Evansville | Indianapolis > > 513-448-5176 (mobile) > > 877-312-7456 (Main Office) > > da...@sesre.com<mailto:da...@sesre.com> <da...@sesre.com> > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > 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 > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > > > > > > > > > > > > "We must all learn to live together as brothers, > > or we all will perish as fools." > > MLK > > > > > > > > > > > > *tump3...@gmail.com <3...@gmail.com>* *www.SWNL.net* > > Solarwinds Northernlights > > * Serving Mid Coast Maine & Northern California* > * 207-832-7574 Cl. > 610-517-8401 * > > *Blair "TUMP" May* > > > * ******** MAINE'S CHARTER ******** ** > NABCEP "Certified PV Installer"* > > > * ******** MAINE'S CHARTER ******** ** > Trace Xantrex "Certified" Dealer / Installer"* > > > > > > > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > 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 > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > 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 > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
_______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org 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 There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
