I'm not too concerned with multi-stage charging. I need to check with the battery manufacturer, but I'm pretty sure they are not, either. The BMS is set up to start the AGS at 20% SOC and charge to 80% SOC at which time the BMS turns off the generator. So we are just talking about bulk charging here. We rely on the XW MPPTs to get the battery up to 100% with solar during the day and maintain the loads.
The battery capacity is currently such that one 20%-80% charge per night occurs on almost every night. The solar capacity is ample. The battery capacity is way too low. It's a long story, as these things often tend to be. There is a complex set of requirements for me to increase charge rate, reduce fuel usage, reduce generator run time (and wear/maintenance), and provide flicker-free luxurious power to a demanding client. Thanks, everyone for the input. Jason On Tue, Apr 21, 2020 at 12:45 PM RE Ellison <reelli...@gmail.com> wrote: > 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/ >> <https://mailtrack.io/trace/link/bf3a7ce8a417cc5e7fa64383db2e59cc1c0aa419?url=http%3A%2F%2Fmembers.sti.net%2Foffgridsolar%2F&userId=1613865&signature=2f13916c569ff90c> >> e-mail offgridso...@sti.net <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/ >>> <https://mailtrack.io/trace/link/bf3a7ce8a417cc5e7fa64383db2e59cc1c0aa419?url=http%3A%2F%2Fmembers.sti.net%2Foffgridsolar%2F&userId=1613865&signature=2f13916c569ff90c> >>> e-mail offgridso...@sti.net <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 >>> <https://mailtrack.io/trace/link/a69724b7f54b55844b856ac59d0a121620abe5c3?url=http%3A%2F%2Flists.re-wrenches.org%2Foptions.cgi%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=73002bcb354b3ad4> >>> >>> List-Archive: >>> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >>> <https://mailtrack.io/trace/link/2a24bf21e4467c78e4505faf63735439e9bf7d01?url=http%3A%2F%2Fwww.mail-archive.com%2Fre-wrenches%40lists.re-wrenches.org%2Fmaillist.html&userId=1613865&signature=857cc806ba5ada16> >>> >>> List rules & etiquette: >>> www.re-wrenches.org/etiquette.htm >>> <https://mailtrack.io/trace/link/401097a08e868494b668d0187f24d50ae17f2fd8?url=http%3A%2F%2Fwww.re-wrenches.org%2Fetiquette.htm&userId=1613865&signature=84c4ea890fe8b4eb> >>> >>> Check out or update participant bios: >>> www.members.re-wrenches.org >>> <https://mailtrack.io/trace/link/a3f79c4baa92d0637a6495020a4f0eb15ed9c20c?url=http%3A%2F%2Fwww.members.re-wrenches.org&userId=1613865&signature=f91a97ca04a488d3> >>> >> _______________________________________________ > 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 > <https://mailtrack.io/trace/link/58ed40dd8ed5c15bf18a6ebc69716058d1f8fe3a?url=http%3A%2F%2Flists.re-wrenches.org%2Foptions.cgi%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=b916fb682691a789> > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > <https://mailtrack.io/trace/link/2ce5c58933a72e6d05b7f86f101b692fdb0a4a8c?url=http%3A%2F%2Fwww.mail-archive.com%2Fre-wrenches%40lists.re-wrenches.org%2Fmaillist.html&userId=1613865&signature=d6f36c98fd82e3a7> > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > <https://mailtrack.io/trace/link/ab0ddddd7969cfc795ba601ec3ba4b21c694fdd1?url=http%3A%2F%2Fwww.re-wrenches.org%2Fetiquette.htm&userId=1613865&signature=0c928df6214c615a> > > Check out or update participant bios: > www.members.re-wrenches.org > <https://mailtrack.io/trace/link/d3c6474903183810e148912ea841852272bcda77?url=http%3A%2F%2Fwww.members.re-wrenches.org&userId=1613865&signature=86c851f80e009124> > > _______________________________________________ > 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 > <https://mailtrack.io/trace/link/ea6059038a201473cf5afa4d8140d90d67e00102?url=http%3A%2F%2Flists.re-wrenches.org%2Foptions.cgi%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=d74287cfd46b9d0d> > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > <https://mailtrack.io/trace/link/8078d84eb7d7cc604a1c3021ee9a65676d5d42fc?url=http%3A%2F%2Fwww.mail-archive.com%2Fre-wrenches%40lists.re-wrenches.org%2Fmaillist.html&userId=1613865&signature=61b1354f734e1f40> > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > <https://mailtrack.io/trace/link/9129af39b5a60053819a6135221d4fd5f56b7aba?url=http%3A%2F%2Fwww.re-wrenches.org%2Fetiquette.htm&userId=1613865&signature=3d88085f1b402d23> > > Check out or update participant bios: > www.members.re-wrenches.org > <https://mailtrack.io/trace/link/cc846ad19ce2c3bcfe80a2946ec83baed6f9b70d?url=http%3A%2F%2Fwww.members.re-wrenches.org&userId=1613865&signature=8c127fcea9a723ca> > >
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