[RE-wrenches] SMA Secure Power Supply

James Gustafson djibrilfall at gmail.com
Mon Jul 29 14:44:05 PDT 2013


Hello Solar Folk,

I'm wondering if it is possible combine the secure power source outputs of
two SMA SBTL-22's in series to run a 240v load, like a small well pump.
Does anyone have any ideas about the feasibility of this concept?

Thank You Much,
Djibril


On Mon, Jul 22, 2013 at 5:46 AM, Carl Adams <swingjunkie at gmail.com> wrote:

>
> Nick,
>
> I guess I don't see this as a weakness but rather operating as designed.
>  If the design intent was to allow the grid tied solar array to provide a
> limited power source during a grid outage, during daylight hours, with no
> batteries required, it seems this hits the mark.
>
> I know these units went through some beta testing early this year, so I
> would still appreciate any feedback  from any wrenches who have actually
> installed them.
>
> With Regards
> Carl Adams
> SunRock Solar
>
> From: Nick Soleil <nsoleil at enphaseenergy.com>
> Date: Fri, Jul 19, 2013 at 9:45 PM
> Subject: Fwd: [RE-wrenches] Fwd: SMA Secure Power Supply
> To: Carl Adams <swingjunkie at gmail.com>
>
>
> I understand that is a good selling point, but the major weakness is that
> it won't work at night and only will provide the amount of power that is
> available from the sun, so not so good for stormy conditions.
>
> ---------- Forwarded message ----------
> From: Carl Adams <swingjunkie at gmail.com>
> Date: Fri, Jul 19, 2013 at 12:48 PM
> Subject: [RE-wrenches] Fwd: SMA Secure Power Supply
> To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
>
>
>
>
> Hello Wrenches,
>
> I'm considering the new SunnyBoy SB3,4,5000 TL-22-US inverters for
> upcoming projects.  The new secure power supply feature seems like a good
> selling point.  At this point I am most interested in field experience from
> those who have already installed these units.
>
> Here is what I have learned from reading up a bit.
>
> My initial impression was that the electrical switch and outlet shown in
> the tech bulletin, youtube video, and discussed in webinars I have seen,
> was an actual "hardware product option".  This is not the case.   It is
> functionality available in the unit as points of connection.  The intent is
> for the installer to pickup the necessary switch and outlet at the local
> supply house and make the connections.
>
> One other thing I learned is that between early marketing and product
> availability the "functionality" name was changed from "Emergency Power
> Suppy (EPS)" to "Secure Power Supply (SPS)" due to NEC code issues.
>
> Another point of confusion for me was in reading the SB3k - 5kTL
> installation manual.  In the manual, the discussion of the SPS uses the
> term "miniature circuit breaker".   My initial thought was this reference
> was to the backfed circuit breaker for the inverter, or a separate circuit
> breaker integral to the inverter.  Not the case, just bad translation from
> German to English.  The reference, is to the off the shelf switch, the
> installer is to use to field install the SPS.
>
>
> Hope this is helpful, and again I'd like to here from those of you who
> have already deployed these units.
>
> Carl Adams
> SunRock Solar
>
>
>
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>
> *Nick Soleil*
>
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