Wrenches This is why AC coupling is not the best solution but you can program the SI to protect low voltage so if this happens you still have headroom to reboot the system, also program the GT inverters not to wait 300 sec to start. I would also suggest having a 48 vdc charger wired directly to the gen set as a fail safe charger to wake up everything. Jerry
On Thu, Dec 17, 2020, 11:55 AM William Miller <will...@millersolar.com> wrote: > Friends: > > > > I have a client living off-grid with a Sunny Island system AC coupled to > Sunny Boy inverters. They returned from being away to find the system > entirely shutdown due to cloudy weather, a dead generator cranking battery > and a water leak which ran two booster pumps continuously over a period of > time. The displays on the Sunny Islands were blank and therefore the > inverters would not start. > > > > We put a new cranking battery into the generator and got it started, but > with no life in the Sunny Islands, neither the generator nor the Sunny Boys > had any possibility of reviving the discharged 6,000 amp-hour lead acid > battery array. Fortunately after disconnecting the batteries for ten > minutes, the voltage rebounded just enough to start the Sunny Islands which > allowed the generator to connect and we were back in operation. > > > > I am not sure why the displays went dead on the Sunny Islands. I am on my > way back out to download and examine the SD card logs. I have developed an > Excel tool to help me tabulate the data. Maybe there is some clue in those > files. > > > > In the meantime I have these questions that those of you with more Sunny > Island experience might be able to answer: > > > > 1. Is it normal for the display screens on the Sunny Islands to go > blank after shutting off due to low battery voltage? > > > > 2. Is there an up-to-date option for remote monitoring that will send > an email if certain error conditions occur? > > > > 3. What would you do with a 6k AH battery bank with a voltage too low > to start a battery inverter or solar charge controller? > > > > Thanks in advance. The wrenches hive-mind is a huge asset. > > > > William Miller > > Miller Solar > > 17395 Oak Road, Atascadero, CA 93422 > > 805-438-5600 > > www.millersolar.com > > CA Lic. 773985 > > > > > _______________________________________________ > 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 > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
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