I have had a hard time getting FM60s (not my install) to sell at the same rate even though they had identical PV on them. They were all on the same Hub and the voltages were the same. I never did explain that. It's been a while but I think that client just gave up because the cost to research and correct it became too high for the relatively small system.
I wouldn't install a DC Coupled grid interconnected system today if the primary purpose was grid selling. AC Coupling has so many advantages. DC Coupled systems always have to have me thinking that they could be selling more. They don't have adequate monitoring for selling. I'm even thinking about going to all AC Coupling even for off-grid. I don't do a ton of off-grid, but I have always been disappointed in the data monitoring and setup interfaces for the various brands of charge controller and how they interact with inverter/chargers. I'm willing to take the efficiency hit to just get good data on the PV output. Jason Szumlanski On Wed, May 20, 2020 at 11:49 AM <scot.a...@solarcentex.com> wrote: > Hello wrenches: > > > > I have a rural “micro-grid” system with eight 8048 Radian, twelve FM80s, > and paralleled RE2700 batteries. I’ll spare you the details of how we got > here (this started as half this size bt we doubled and enlarged to micrgrid > support instead of single ranch dwelling.) > > > > Because of the increases, the ability to network all together with hubs is > not possible. > > > > It seemed as if the FM80s were not producing as much as they could. I’ve > checked the charging parameters and feel good about those. All voltages are > calibrated across the FM80s as well as the Mate 3. The Mate 3 is connected > to the eight inverters only. The FM80s are not networked together; I was > concerned about that until I read an earlier post here. > > > > Yesterday, I left with an impression that my challenge might be the > inverters not selling to their maximum potential. It seemed like they > certainly had more voltage “space” before they hit the lower threshold for > sell voltage but the inverters just were not making as much I expected them > to make. > > > > Only indication to give you is that the inverters, as seen on the Mate 3, > would cycle up to a max about 11kw of selling back to the grid and then > return back to 4KW of selling (while meeting minimal household loads on > during home reconstruction. It would hit this peak and cycle down before it > hit the sell voltage. > > > > Each port for each inverter is set for 50A. The charger for each port is > set for 30A (even though to be quite honest I just do not know why/how the > charger must be on for a grid-tied system with PV charging…) > > > > Any thoughts or recommendations? I waited for a return call form Outback > but nothing yet and know somebody here will have some ideas. > > > > > > > > > _______________________________________________ > 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/abed719dc5599e707fefc032c9f34f64372f8c4a?url=http%3A%2F%2Flists.re-wrenches.org%2Foptions.cgi%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=8ee9fc2f33cdf672> > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > <https://mailtrack.io/trace/link/bba23446cad610beb50c0b9687529bef84c8a44f?url=http%3A%2F%2Fwww.mail-archive.com%2Fre-wrenches%40lists.re-wrenches.org%2Fmaillist.html&userId=1613865&signature=441ad154a8e395a4> > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > <https://mailtrack.io/trace/link/4272056687cf80a1205b3e0a80f75b4c6c654072?url=http%3A%2F%2Fwww.re-wrenches.org%2Fetiquette.htm&userId=1613865&signature=e84cef9aa2c142a5> > > Check out or update participant bios: > www.members.re-wrenches.org > <https://mailtrack.io/trace/link/888a94a361d11c5db25e069607dad209f76350c3?url=http%3A%2F%2Fwww.members.re-wrenches.org&userId=1613865&signature=4fd5fa0e01efc654> > >
_______________________________________________ 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
