And also most battery chargers are not multi stage they’re big taper type chargers
They don’t charge nearly as efficiently or as well as a three stage inverter charger Bob Ellison > On Apr 21, 2020, at 12:32 PM, Jason Szumlanski > <ja...@floridasolardesigngroup.com> wrote: > > I'm not sure I follow. I would disconnect the generator AC2 input from the > existing quad XW system and move it to the external chargers. Or, I could > just turn the charging off by software config in the XWs. > > If I were to buy four inverter/chargers to serve as "external" chargers for > the battery (any brand, really) I would just connect the generator input to > AC2 and the battery to the batt terminals of the four inverters. The AC1 > input/output would have no connections. The inverter function would be turned > off and the charger function turned on. > > Again, this would be an expensive solution. I'm sure there are some companies > making high output DC chargers. I assume a 48V model will be able to go up to > 60V charging output, which would be plenty for my 51V nominal system. > > > > > >> On Tue, Apr 21, 2020 at 11:44 AM Dave Angelini Offgrid Solar >> <offgridso...@sti.net> wrote: >> 4 xw's need the external relay contactors not the internals, Right? >> >> You will destroy the internals relays. If there was warranty still left, and >> there is not on 6048, you would need to scrap them for parts. Xw logs welded >> relay warnings and faults for warranty on all xw's. >> >> Dave Angelini Offgrid Solar >> "we go where powerlines don't" >> http://members.sti.net/offgridsolar/ >> e-mail offgridso...@sti.net >> text 209 813 0060 >>> On Tue, 21 Apr 2020 08:27:53 -0400, Jason Szumlanski >>> <ja...@floridasolardesigngroup.com> wrote: >>> >>> I actually need 400Adc at 51V nominal of total charge rate. I was hoping to >>> use 100Adc chargers for redundancy, or some combination of 2-8 chargers to >>> reach the needed current, assuming they can be synced up. I don't think the >>> charging algorithm needs to be complicated. We are basically bulk charging >>> the LiPOs to 80% with the battery BMS controlling the generator. The >>> concept is to get to 80% sometime in the night and solar kicks in during >>> the day to reach 100% using 2-stage charging from the XW charge controllers. >>> >>> The problem I have is the quad XW6048s in the system run at a pretty good >>> load typically... often over 50%. This is off-grid with generator backup. >>> The transfer switches in the XW6048 are causing surges and brownouts when >>> the switched loads are high, especially smart dimmers and televisions. I >>> need seamless power for this client. My thought is to abandon the internal >>> chargers in the XW6048s and just run loads off inverter power full-time. I >>> would charge the batteries with external battery chargers. The tricky part >>> is how to adjust the charge rate based on load, and also based on solar >>> input. I need to limit the net charging current. Of course, I still need >>> 400Adc of charging current, which I'm learning might be hard to find. I >>> don't really want to buy four more XWs - that's a pretty expensive >>> solution. >>> >>> Jason Szumlanski >>> Florida Solar Design Group >>> >>> >>>> On Fri, Apr 17, 2020 at 4:26 PM Dave Angelini Offgrid Solar >>>> <offgridso...@sti.net> wrote: >>>> I use the CSW 4048. It has a 50 amp charger. A good spare for clients. Get >>>> 2 of them. Repurpose an old Radian or XW well over 100A. XW+ is 140adc. >>>> >>>> Dave Angelini Offgrid Solar >>>> >>>> "we go where powerlines don't" >>>> http://members.sti.net/offgridsolar/ >>>> e-mail offgridso...@sti.net >>>> text 209 813 0060 >>>> On Fri, 17 Apr 2020 14:21:14 -0400, Jason Szumlanski >>>> <ja...@floridasolardesigngroup.com> wrote: >>>> >>>> I'm looking for a standalone 51V nominal battery charger suitable for a >>>> LiPO battery with 2-stage charging and adjustable setpoints for max >>>> current and battery voltage. It would require dual chargers with 100A >>>> capacity (I want dual chargers for redundancy so I have at least 50% >>>> capacity if one goes bad). Ideally they would sync up so they change >>>> stages simultaneously, but I'm not sure if that's really important. >>>> >>>> Who makes something like that? >>>> >>>> Jason Szumlanski >>>> >>>> >>>> _______________________________________________ >>>> 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 >
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