[RE-wrenches] Sunny Island/Fortress E-vault

[Mac Lewis]

Hi William,

Are you doing open loop or closed loop communication?  I'm not sure if
Fortress can do a closed loop with SMA or not.

We struggled to get the open loop to work well with some Blue Ion
batteries, not from a charging sense but from a sense of getting the auto
gen start to trigger correctly.  Basically, the SOC algorithm was always
way off.  For a while we were using an external voltage trigger and we
could get the generator to start OK before BMS shutdown.  We have since
added a Namaka box and are using the "Ext BMS" setting for battery type in
the Sunny Island and it has been working very well.

I think the difficulty arises because the Sunny Island is so
State-of-Charge centric and you can't manipulate the SOC algorithm without
that Ext-BMS setting (and solid communication).  One weakness of the
ext BMS setting is that it won't fall back on Voltage settings if battery
communication goes down, but this is a weakness throughout closed loop
communication for many manufacturers.

Let us know if there is a Fortress to SMA communication solution.





On Fri, Sep 15, 2023 at 11:11 PM Jerry Shafer via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> William, Wrenches
> Yes I do and it does require some basic electronics to make it work
> correctly, you will need to remove the ttemp sender and make a
> resistor pack to simulate the 77 degree reading otherwise it will not
> charge properly, for the first one I used a breadboard to set the temp for
> what I wanted to see then build a more solid state shrink wrap resistor.
> Doing this will prevent undercharge by the SMA and your customer will be
> happy to see the full state of charge at the batteries.
> OldSchool fun times
>
>
>
> On Thu, Sep 14, 2023 at 2:12 PM William Miller via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Friends:
>>
>>
>>
>> I am commissioning an E-vault battery array to an existing SMA Sunny
>> Island System.  Does anyone have any experience with this they could share?
>>
>>
>>
>> Thanks.
>>
>>
>>
>> William
>>
>>
>>
>> Miller Solar
>>
>> 17395 Oak Road, Atascadero, CA 93422
>>
>> 805-438-5600
>>
>> www.millersolar.com
>>
>> CA Lic. 773985
>>
>>
>>
>>
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-- 



Mac Lewis

*"Yo solo sé que no sé nada." -Sócrates*
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