[RE-wrenches] Generator choice for Sunny Island

[August Goers]

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



On Mon, Jul 24, 2017 at 5:36 AM, Drake <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
>> CA Lic 874049
>> 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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