[RE-wrenches] Sunny Island retrofit

[Jerry Shafer]

Group
I might consider a third option SMA all the way, one additional island and
go with SMA on the output side of the now two islands, SMA seems to work
better with communication. I have a system someone else installed and there
they used an outback and did a DC coupled it works but it has issues
resulting from no communication. Yes it will cost more but the solution is
a better one. Communication between all devices will result in a smarter
better system.


On Thu, Jul 3, 2014 at 7:46 AM, Mac Lewis <maclewis1 at gmail.com> wrote:

> Hello wrenches,
>
> I wanted to run this scenario by the forum.  I have spoken with SMA about
> this, but want some other opinions.
>
> We were recently contracted by a fellow solar company to do some warranty
> work for them out of town on a Sunny Island system that they had installed
> about 5 years ago.  It was VERY poorly implemented originally and was never
> installed as SMA intended.  In fact, during a small power outage, the only
> loads that never came back on after the utility was back on line were the
> loads in the critical load panel.  Oops.
>
> Anyway, our job is to get it working properly for the least amount of cost
> possible.  They have a Fronius IG Plus 10.0 fed into a 400A service panel.
>  The Sunny Island 5048 AC Input also comes off of this panel and feeding a
> 120V only critical load panel.  Please note that there is no solar fed into
> the AC output side of the Sunny Island, because there is not 120/240
> available and thus there is no possible way for this system to utilize the
> solar while the grid is not present.
>
> I see two options (but there may be more): pull out Fronius, put in Sunny
> Boy inverters and an autoformer, wire properly.  Another option is to add
> second Sunny Island and try to AC couple the Fronius with the two Sunny
> Islands.  The second option is less expensive overall, but I'm hesitant to
> rely on AC coupling with the Fronius.
>
> I'd appreciate any thoughts on this.
>
> Thanks
>
>
>
>
>
> --
>
>
>
> Mac Lewis
>
> *"Yo solo sé que no sé nada." -Sócrates *
>
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