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.chamber...@redwoodalliance.org
<mailto:drake.chamber...@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
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