[RE-wrenches] Generator choice for Sunny Island
Ray
ray at solarray.com
Mon Jul 24 13:23:35 PDT 2017
My experience with Sunny Islands are that their SOC can be off by quite
a bit. Unfortunately with sealed batteries, you can't check SG with a
hydrometer to confirm, and tweak the settings. Probably the best you
could do, is shut the system down and let the batteries sit for long
enough to take voltage readings to double check the SOC.
I found systems that the SI thought it was close to full, but the
batteries were actually only at 60%.
R. Ray Walters
Chief Technical Officer, RemoteSolar.com
BS Mech Engineering, 1988
Former NABCEP Certified, 2004-2016
Licensed Master ELectrician, Colorado
303 505-8760
On 7/24/17 2:16 PM, August Goers wrote:
> Hi Drake,
>
> Good questions. Yes, the taper charge appears to be working well. I've
> been to the site a couple of times where loads were low, irradiance
> was high, and battery SOC was ~90% and the Sunny Boy was just covering
> the load and a little trickle charge.
>
> I have noticed that the SOC seems to max out around 90 to 92% - that
> seems to be the case with Sunny Islands in general. I'm not enough of
> a battery expert to know if this is a good thing or not. I do know
> that I custom programmed in all the AGM battery parameters and set max
> voltages. I also disabled equalize mode since I couldn't find any
> literature from US battery on recommendations for their AGM.
>
> August
>
> *August Goers*
>
> Luminalt Energy Corporation
>
> o: 415.641.4000
>
> m: 415.559.1525
>
> www.luminalt.com <http://www.luminalt.com>
>
>
> On Mon, Jul 24, 2017 at 5:36 AM, Drake
> <drake.chamberlin at redwoodalliance.org
> <mailto:drake.chamberlin at redwoodalliance.org>> wrote:
>
> Are you getting a good taper charge with this system? Are the
> batteries reaching a decent state of charge from the AC coupled
> connection with the inverter?
>
> Thanks,
>
> Drake
>
>
>
> At 11:08 AM 7/23/2017, you wrote:
>
> August,
>
> Of course the genny itself has its own emission of
> noise but the environment its in certainly will affect its
> overall "annoyance level". Backed up to metal container is a
> negative, I can't tell from the photo if the Kohler is on the
> side away from most of the public, probably don't have to go
> on, you must have thought of these things....it could have its
> own (partial?)enclosure with some sound deadening qualities.
> Hondas are a little quieter but not that much, hopefully the
> darn thing doesn't have to come on, eh?
>
> Nice set-up.
>
> Bill
>
> Feather River Solar Electric
> Bill Battagin, Owner
> 4291 Nelson St.
> Taylorsville, CA 95983
> 530.284.7849 <tel:530.284.7849>
> CA Lic 874049
> www.frenergy.net <http://www.frenergy.net>
>
> On 7/21/2017 11:39 AM, August Goers wrote:
>
> All,
>
> I thought I'd provide an update on our setup since we've
> completed the install and commissioning. More or less, the
> installation went well. We did have one of the US Battery
> AGM L16 batteries dead on arrival with a bad cell. That
> bad battery screwed up the state of charge (SOC)
> calculations in the Sunny Island and made the SOC reading
> jump from ~ 80% to 19% in just a couple of minutes. It was
> easy to find the bad battery - all the batteries were
> about 6.5 v with the bad battery reading about 4.5 v. We
> pulled that battery out of the string for warranty
> replacement and are currently running it with seven
> batteries at 42 v nominal. It's cool that the Sunny Island
> allows for this. Other than that, the frequency shift
> derate between the Sunny Island and Sunny Boy is working
> perfectly and the system has more than enough capacity to
> run the loads during the summer months. I'd say the Kohler
> generator is the nice unit although it is a little loud
> for this application. If I had to do this portable
> application again, I'd probably just go with the Honda 7000.
>
> Thanks for your help! August
>
>
> ---
> This email has been checked for viruses by Avast antivirus
> software.
> https://www.avast.com/antivirus <https://www.avast.com/antivirus>
>
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches at lists.re-wrenches.org
> <mailto:RE-wrenches at lists.re-wrenches.org>
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
> <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
> <http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html>
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
> <http://www.re-wrenches.org/etiquette.htm>
>
> Check out or update participant bios:
> www.members.re-wrenches.org <http://www.members.re-wrenches.org>
>
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches at lists.re-wrenches.org
> <mailto:RE-wrenches at lists.re-wrenches.org>
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
> <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
> <http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html>
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
> <http://www.re-wrenches.org/etiquette.htm>
>
> Check out or update participant bios:
> www.members.re-wrenches.org <http://www.members.re-wrenches.org>
>
>
>
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches at 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
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20170724/279b47e0/attachment-0002.html>
More information about the RE-wrenches
mailing list