I have had generally a good experience with
Sunny Island battery charging. There are
definitely way too many parameters to set, but
their charging algorithm is designed to bring
batteries up to ~90% on the "boost" charge
(every 1-2 days), 95% on their "full" charge
(typically every 10-14 days) and 100% on their
"equalize" charge (typically 120 or 180 days for
flooded batteries). It is a different algorithm
than any other battery inverter that I've
programmed, and I was very skeptical when I
first used a SI, but over the years, it does
seem to maintain the batteries well (equalize is
generally disabled on sealed batteries). They
claim it is the best method, but I do not have
enough data points to determine that it works
better or worse than the more traditional "bulk/absorb/float" setup.
Howie
On Mon, Jul 24, 2017 at 4:26 PM, Tom Duffy
<<mailto:[email protected]>[email protected]> wrote:
8 hours at least but 24 would be more accurate
Â
Kind regards
Â
Tom Duffy
Senior Solar Design Engineer
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From: RE-wrenches
[mailto:[email protected]] On Behalf Of Ray
Sent: Monday, July 24, 2017 3:24 PM
To:
<mailto:[email protected]>[email protected]
Subject: Re: [RE-wrenches] Generator choice for Sunny Island
Â
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
<tel:(303)%20505-8760>303 505-8760
On 7/24/17 2:16 PM, August Goers wrote:
Hi Drake,
Â
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.Â
Â
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.Â
Â
August
August Goers
Luminalt Energy Corporation
o: <tel:(415)%20641-4000>415.641.4000
m: <tel:(415)%20559-1525>415.559.1525
<http://www.luminalt.com>www.luminalt.com
Â
Â
On Mon, Jul 24, 2017 at 5:36 AM, Drake
<<mailto:[email protected]>[email protected]>
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
<tel:530.284.7849>530.284.7849
CA Lic 874049
<http://www.frenergy.net>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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