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

[Kirk Herander]

Jerry,

Who is the maker of the Blue Planet/Outback SOC box interface you mention?

On Sat, Sep 16, 2023 at 9:30 AM Jerry Shafer via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> 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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