the communication cable IS required, to switch the Sunny Boys from grid tie to off-grid mode, in the event of a grid failure. This is true for the older SB U series, while one is able to move the rotary switch on the TL series of inverters. This grid/off grid setting is also able to be adjusted using the SMA service tool. This Off Grid mode set in the SB inverters can only be used when using a SI as now the SI is meeting the anti island mode for any grid tied system. Com cable is used between the SI & the SB for the web box & sunny sensor box.
On Jan 16, 2016, at 1:30 PM, Richard L Ratico wrote: > All, > > I've just updated the inverter firmware (to version 7.302) in an off-grid > 120/240 Volt split phase Sunny Island, generator only system I installed in > 2007. It's my understanding the Sunny Islands DO need an external shunt if if > there are any DC loads or charging sources. I don't have any of those, other > than battery vent fans, but installed a shunt anyway to work with a Trimetric. > > Furthermore, In an off-grid install, the Sunny Islands control Sunny Boy > inverters (which are pre-programmed for off-grid use) by frequency shifting > alone, no separate communication cable is required. In a grid-tie, battery > backup situation, the communication cable IS required, to switch the Sunny > Boys > from grid tie to off-grid mode, in the event of a grid failure. > > Dick Ratico > Solarwind Electric > > > --- You wrote: > Hi Mark, > > If all battery power flows in and out of Sunny Island(s) then it will keep > track of SOC without a external shunt. I'm not sure how it does it but all > the SOC dependent controls work fine in that scenario. The SOC algorithm > calculation works much better than any other that I've used. > On Jan 16, 2016 1:34 PM, "Mark Frye" <[email protected]> wrote: > >> Folks, >> >> I know with both the Radian and the SI you can use an external shunt to >> support the measurement of KWH and support various SOC controls. >> >> But what happens if you don't use an external shunt? >> >> I am pretty sure that the Radian does not have an internal shunt to >> support SOC control. >> >> What about with the SI? Does it implement it's SOC controls even without >> an external shunt? >> >> Thanks, >> >> Mark Frye >> Berkeley Solar Electric Systems >> > --- end of quote --- > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > [email protected] www.SWNL.net > Solarwinds Northernlights > Serving Mid Coast Maine & Northern California > 207-832-7574 Cl. 610-517-8401 > > Blair "TUMP" May > ******** MAINE'S CHARTER ******** > NABCEP "Certified PV Installer" > > ******** MAINE'S CHARTER ******** > Trace Xantrex "Certified" Dealer / Installer" >
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