[RE-wrenches] SMA Secure Power Supply

Tue Jul 23 23:02:03 PDT 2013

If the grid fails, and comes back up the next day (when the unit powers back up from DC) it will automatically search for the grid first. If the grid is not back,  the homeowner will have to exercise the switch to regain the SPS function.

Steve

Sent from my iPhone

On Jul 22, 2013, at 3:33 PM, "Gary Willett" <Gary at IcarusSolarServices.com<mailto:Gary at IcarusSolarServices.com>> wrote:

CARL:

I have not installed any SBs with the "SPS" feature.

My understanding is that manual activation and deactivation of the SPS grid-loss outlet is required.

Not a big deal, but the homeowner has to remember to deactivate the function when grid power returns in order to start delivering power again from the SB.

Regards,

Gary Willett
Icarus Engineering LLC

On 7/22/13 6:46 AM, Carl Adams 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<mailto: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<mailto: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<mailto: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<mailto: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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