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 > <[email protected] > <mailto:[email protected]>> 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. > > [email protected] <mailto:[email protected]> > > > > Message: 1 > Date: Tue, 4 Apr 2023 20:45:44 +0000 > From: Daniel Young <[email protected]> <mailto:[email protected]> > To: "[email protected]" <mailto:[email protected]> > <[email protected]> <mailto:[email protected]>, RE-wrenches > <[email protected]> > <mailto:[email protected]> > Subject: Re: [RE-wrenches] replace part of rolls battery bank > Message-ID: > > <bl1pr12mb5921cde5991f65fa842bc82cbb...@bl1pr12mb5921.namprd12.prod.outlook.com> > > <mailto: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) > [email protected] <mailto:[email protected]><mailto:[email protected]> > <mailto:[email protected]>_______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > <http://re-wrenches.org/> > > List Address: [email protected] > <mailto:[email protected]> > > 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> > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > 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 > Tump > <blocked::mailto:[email protected]%22%20%5Co%20%22blocked::mailto:[email protected]>[email protected] > www.SWNL.net > <blocked::http://www.swnl.net/%22%20%5Co%20%22blocked::http://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: [email protected] 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/[email protected]/ 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
