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/818d0fc14d35240172dc7b5e76e9b358639d0699?url=http%3A%2F%2Fmembers.sti.net%2Foffgridsolar%2F&userId=1613865&signature=a20ca8855bc640ef> > 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/47d978507b9775cf89c2c4ac9665997e7f3c2d10?url=http%3A%2F%2Flists.re-wrenches.org%2Foptions.cgi%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=61d5cd552bcb7a04> > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > <https://mailtrack.io/trace/link/751a499f55945df4070b9d5521e2cdfbcea242a8?url=http%3A%2F%2Fwww.mail-archive.com%2Fre-wrenches%40lists.re-wrenches.org%2Fmaillist.html&userId=1613865&signature=8afbf050d5afe9e0> > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > <https://mailtrack.io/trace/link/371ce356d356262bb1fe8e503601758f8bac958e?url=http%3A%2F%2Fwww.re-wrenches.org%2Fetiquette.htm&userId=1613865&signature=eb4588d3c5c730cd> > > Check out or update participant bios: > www.members.re-wrenches.org > <https://mailtrack.io/trace/link/e9ea24bb0cec5ce64b3012496a3a8b6390d7a863?url=http%3A%2F%2Fwww.members.re-wrenches.org&userId=1613865&signature=b340c2774b3cc0f9> > >
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