Hi Mark Set up properly with the 3 protection thresholds plus generator auto start you shouldn't need any DC PV input. Seems a shame to spend the money on a charge control etc when SMA has carefully provided a built in solution.
If you do decide to go that route you'll need to install a Shunt and set up the DC Current Sense circuit so the inverter knows what other current is flowing to and fro the batteries. Best, Jeff Sent from my iPhone On Jun 6, 2015, at 7:23 AM, Mac Lewis <maclew...@gmail.com> wrote: > Hi Mark, > > The Sunny Island has various battery protection modes and will shutdown based > on user programmable state of charge levels. Level 2 battery protection will > start the Sunny Island every 2 hours in an attempt to get charge into the > batteries. You should set this level up at times when energy input is > likely. See page 113-114 here: > http://files.sma.de/dl/15216/SI4548-6048-US-BE-en-20.pdf If it doesn't get > any charging to the batteries for 10 minutes, it will shut down and wait > again. > > This is an advantage of having at least some DC coupled solar input. > > > > On Sat, Jun 6, 2015 at 7:39 AM, Mark Frye <ma...@berkeleysolar.com> wrote: >> Hi Guys, >> >> Just wondering about how a SI/SB microgrid works. If all the PV is connected >> to SB inverters, what happens if the loads manage to drain the batteries to >> their low voltage shutdown? Wouldn't the SB stop providing the AC sync so >> then the SB wouldn't have anything to sync to even if they had power >> available from the PV? >> >> How is this handled? It seems to me you would always want to have some >> amount of PV DC coupled. >> >> Thanks, >> >> Mark Frye >> Berkeley Solar Electric Systems >> _______________________________________________ >> 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 > > > > -- > > > > Mac Lewis > > "Yo solo sé que no sé nada." -Sócrates > > _______________________________________________ > 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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