[RE-wrenches] SI6048/SB4000US

[William Miller]

Lou:

I have worked hard to understand the Sunny Island. To me it is not that
intuitive.

As far as I know 231.05 tells the system simply if you have a generator or
if you do not have a generator.

One needs to consider the Backup mode setting on the Sunny Boy(s). Options
are On All or Off. I have tried both and I can’t quantify any difference.
If anyone knows please let me know.

William Miller
Miller Solar.com
805-438-5600
www.millersolar.com


On Mon, May 26, 2025 at 9:33 PM Lou Russo via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Aloha All,
>
> I am messing around with a system in our shop just 'cause I wanted to mess
> around with AC coupled systems at my leisure.  This setup is completely
> off-grid. I have an autoformer between the SB and the SI.
>
> I am able to make changes to the parameters on the SB with an old Webbox
> and a RS485 Piggyback card.
>
> The manuals I found online are showing a slightly different set of
> parameters than what I am seeing in real life. For instance, there is no
> "country standard" parameter on the SB. And when I make the recommended
> changes to the parameters that do match up with the manuals, the value
> ranges on the SB are much tighter so it does not let me enter negative
> numbers as the manuals are wanting me to set for frequency shifting to work
> well. I am not in the mood to torch the three Discover 7.4s attached to the
> SI6048.
>
> Makes me think there is a firmware update but SMA's website returned
> nothing. It is currently running BFR 2.72 and SRR 2.72. The SB is from 2009.
>
> Any thoughts on an old (but newer) firmware? Is it even possible to update
> the firmware on this dinosaur?
>
> While I am at it, can any one explain the difference between "PvOnly" and
> "Gen" for setting 231.05 ExtSrc on the SI6048?  The manual is lacking
> reassuring details.
>
> Thanks for entertaining my sadomasochism.
>
> Aloha,
> Lou Russo
> Spree Solar Systems LLC
> C-34322
>
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