Wrenches, Jason I have done this when l dont want tranfer switch operation but you are looking for 400 amps at 51vdc that around 20 kW of charger. l used golf cart chargers but you may want to consider a forklift charger, they are quick and basic, the BMS/U will manage the charge rates anyway. I would run everything through a shunt for monitoring either through the box or via an eguage and DC shunts. You should be able to let the inverter turn on genny but programmed as a DC charger not AC at least with Outback we can do that. Fun times Jerry NABCEP PV Inspector
On Tue, Apr 21, 2020, 5:28 AM 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/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> >> >> _______________________________________________ > 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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