Louis: Thanks for the message. I’m a bit embarrassed that I misunderstood the start voltage significance. I modified the string wiring and system is operating. Thanks again!
William Miller > On Apr 24, 2019, at 7:46 AM, <lo...@solarcowboyz.com> > <lo...@solarcowboyz.com> wrote: > > William, > > The start voltage is 285v from what I see covered on the specifications in > manual. > Data sheets are not specifications, I have seen many a error on these over > the years. > > This voltage is way low regardless if the start voltage was 220v. > By the time the PV voltage gets dragged down when finding the VMPP it is > going to be down near the low end of the range anyway. > > I always like to see the VMPP up near the top of the VMPP point(but not to > high!). > This means less current, which means less heat, which means longer life. > > Looks like the is either a PV problem or a bad design in the first place. > > Louis Segarra > > > -------- Original Message -------- > Subject: Re: [RE-wrenches] SMA Micro-grid > From: William Miller <will...@millersolar.com> > Date: Tue, April 23, 2019 11:40 am > To: Harry Mahon <michael.ma...@sma-america.com> > Cc: RE-wrenches <re-wrenches@lists.re-wrenches.org> > > Mike: > > Thanks for the reply. Good information. > > The AC system is 208. The data sheet indicates that for 208 the PV startup is > 220. Today we have 260 VDC. That should be enough!? > > I checked EMT he AC frequency in case it was on shift mode. It is right at > 60.00. > > Still in waiting mode. I had always thought “waiting” was for grid reconnect > timeout... > > William > >> On Apr 23, 2019, at 8:47 AM, Harry Mahon <michael.ma...@sma-america.com> >> wrote: >> >> William – >> Waiting mode means the DC voltage is below the inverter start. For SB >> 4000-12, that would be 285 VDC (and will work to 250VDC once that is hit). >> >> If you knock on the inverter lid, the display will cycle and you will see >> the DC voltage displayed. >> >> If the yellow LED is not on, this should not be an AC side issue. >> >> I do not think the “Backup Mode” parameter would be the cause, but if the >> voltage check shows well above PVstart, it would be worth a call to service. >> If the inverter was left in on grid mode, then it will work when the SI is >> creating a micro-grid with frequency within UL1741 limits. If the system is >> off-grid, I would think the SB would have been set to off-grid mode rather >> than enabling Backup Mode to “on all” that allows switching from on-grid to >> off-grid parameter sets by RS485 command. >> >> Best- >> Mike >> >> From: RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> On Behalf Of >> William Miller >> Sent: Monday, April 22, 2019 6:54 PM >> To: RE-wrenches <re-wrenches@lists.re-wrenches.org> >> Subject: [RE-wrenches] SMA Micro-grid >> >> Friends: >> >> I am working on an AC coupled SMA system in an off-grid setting. We have an >> SB4000-12 that was disconnected for a number of years and we reconnected it. >> The inverter is stuck in the waiting mode and will not generate power. >> The Sunny Islands and Sunny Boys are connected via an RS485 communication >> system. >> >> I suspect there is a programming step I have not yet accomplished. I recall >> some years ago I programmed the other Sunny Boys for off-grid operation. I >> can’t find anything in any of the manuals about how to check the >> programming. I also suspect SAM tech support talked me through this and the >> information may not be published. >> >> Does this ring a bell with any of you? Any advice? >> >> Thanks in advance. >> >> William Miller >> >> Miller Solar >> 17395 Oak Road, Atascadero, CA 93422 >> 805-438-5600 >> www.millersolar.com >> CA Lic. 773985 >> >> Quote of the day: “If there is a job you hate, get really, >> really good at it. Maybe you will hate it less.“ W. Miller >> > _______________________________________________ > 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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