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

[Jerry Shafer]

Mac, wrenches
SMA and fortress can only open loop and with a fixed temp sender its fine.
Now on the blue planet and open loop with outback, you need a SOC box that
they can make for you, it will interface with the blue planet and command
the genny.
Fun times

On Sat, Sep 16, 2023, 6:04 AM Mac Lewis <maclewis1 at gmail.com> wrote:

> 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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