[RE-wrenches] More on AC coupling
jay peltz
jay at asis.com
Wed Nov 26 15:27:14 PST 2008
Hi Dana,
So is the issue that any 120v 60 hz units are all the US versions, or
do they have 120v 60 hz international versions ( probably non UL)?
My asking is that I've got some large projects in Baja that could use
full feature and larger stacking than the US version.
thanks,
jay
peltz power
On Nov 26, 2008, at 1:32 PM, Dana Brandt wrote:
> Thanks for the report, Steve. I'm also a huge fan of the European
> SI. We need to be careful when we start to compare operations across
> the ocean. The US version of the SI is a bit different from the
> European version. SMA in Germany decided that the full-featured SI
> would be too expensive for the US market, so they sent us a stripped
> down, cheaper version. The US version still has some nice features,
> but it has some limitations when compared to the full-featured
> European version. One of the brilliant aspects of the full-featured
> SI is the multi-master operation. I wrote a little bit on the SI for
> AC minigrids and the multi-master operation in HP 109 - Oct/Nov
> 2005. It's frustrating to me that SMA hasn't UL listed a full-
> featured SI for us in the States, but they must figure it doesn't
> make financial sense for them.
>
> Dana
>
> --
> Dana Brandt
> Ecotech Energy Systems, LLC
> www.ecotechenergy.com
> dana at ecotechenergy.com
> 360.510.0433
>
>
> On Wed, Nov 26, 2008 at 10:20 AM, <Steve at windandsun.co.uk> wrote:
> Hi Tump,
>
> Yes, the SI & SB system is all it's cracked up to be!
>
> I'm not sure what is possible in the US but we've been running a 60kW
> Sunny Island system for over a year now which powers the Scottish
> Isle of Eigg and uses PV's with Sunny Boys, wind turbines with Windy
> Boys, 100kW hydro turbine & back-up diesel generation. Power is
> distributed around the island at 3.3kV three-phase using step-up &
> step-down transformers. The generation is located at various parts of
> the island (as are the houses & loads) with the Sunny Islands/Battery
> Store & back-up diesels roughly in the middle.
>
> See our website for a full description:
> http://www.windandsun.co.uk/projects_eigg.htm
>
> The Sunny Island inverters use 'Frequency Shift Power Control' -
> variations in island grid frequency to communicate control signals to
> the generation sources and to bonus loads. If the batteries cannot
> absorb the renewable power being generated onto the network (if they
> are full, or the power generated exceeds the inverter/charger
> capacity), the Sunny Island inverters raise the system frequency.
> Sunny Boy & Windy Boy inverters are set to 'Off-Grid' mode to respond
> to this frequency rise and back off power being fed into the system.
> Other renewable generation (eg. hydro turbines) that is able to
> respond to this frequency rise to restrict their power output can
> also be incorporated in the system.
>
> The raised frequency can also be used to trigger switching on of
> bonus loads when there is surplus renewable energy output.
>
> The great thing about using this frequency shift for control is that
> no communication cabling, special circuits or dedicated switching is
> required and distance is no problem.
>
> The other great thing about using the Sunny Island system is that it
> allows use of the Sunny Webbox for remote monitoring. This means
> every morning I can check on the internet to see how the system is
> performing, view state of charge of batteries, and dial in to change
> things if needed. Furthermore, several people can do this at once -
> eg. system owners & SMA technical support - so we can all look at
> what's been happening and discuss any events. (I'm sure you all know
> how useful this can be!)
>
> As an example the attached Word document shows how the frequency
> shift works in practice (Hope it's Ok to send attachments on this
> list)
>
> Regards
> Steve Wade
>
>
>
> From: "Tump" <tump at hughes.net>
> To: "'RE-wrenches'" <re-wrenches at lists.re-wrenches.org
> >
> Date sent: Wed, 26 Nov 2008 08:33:38 -0500
> Subject: Re:
> [RE-wrenches] More on AC coupling Send reply to: RE-wrenches
> <re-wrenches at lists.re-wrenches.org>
> <mailto:re-wrenches-request at lists.re-
> wrenches.org?subject=unsubscribe
> >
> <mailto:re-wrenches-request at lists.re-wrenches.org?subject=subscribe>
>
> > Matt, I have long been interested in installing the SMA SI & SBs but
> > I have a VERY tough time selling $9ks worth of inverters, just to
> > get things started. In the system below I would not of hesitated in
> > installing the SMA SI & SB! I too agree that w/this type of scenario
> > described below, I would have given quite a bit of thought to using
> > the SMAs. Can't beat the battery charging, no charge controllers &
> > expandability.
> > Please if there is someone out there that has had experience w/ the
> > SMA SI
> > & SB let us know if it is all that it is cracked up to be!
> > With passport in hand, I offer my help if someone out there has a
> > large system like this, that will be using the SI & SB/WB type of
> > set up. TUMP
> >
>
> Wind & Sun Ltd., Humber Marsh, Stoke Prior,
> Leominster, Herefordshire, HR6 0NR.
> Web: www.windandsun.co.uk
>
> Tel: 01568 -760671
> Fax: 01568-760484
>
> The latest edition of the Wind & Sun Design Guide & Catalogue is now
> available.
> This has 112 pages detailing our product range and is packed with
> information
> and advice about setting up or using a wind or solar electrical
> system.
> Price is £5.00 + £1.00 p&p.
>
> Wind & Sun Ltd
> Registered in England & Wales, Company Number 3403803
> VAT Number GB 448 5458 14,
> Registered Office: Humber Marsh, Stoke Prior, Leominster,
> Herefordshire, HR6 0NR
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>
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