[RE-wrenches] More on AC coupling
Matt Tritt
solarone at charter.net
Wed Nov 26 16:08:38 PST 2008
Jay,
Nope. We are stuck with just what they are offering in the US market -
maximum of 4 units in single phase and 3 in three phase. A bummer for
sure, considering what is possible in the 50 Hz version!
Matt T
jay peltz wrote:
> 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 <http://www.ecotechenergy.com>
>> dana at ecotechenergy.com <mailto:dana at ecotechenergy.com>
>> 360.510.0433
>>
>>
>> On Wed, Nov 26, 2008 at 10:20 AM, <Steve at windandsun.co.uk
>> <mailto: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
>> <mailto:tump at hughes.net>>
>> To: "'RE-wrenches'"
>> <re-wrenches at lists.re-wrenches.org
>> <mailto: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 at lists.re-wrenches.org>>
>> <mailto:re-wrenches-request at lists.re-
>> <mailto:re-wrenches-request at lists.re->
>> wrenches.org?subject=unsubscribe
>> <http://wrenches.org?subject=unsubscribe>
>> >
>> <mailto:re-wrenches-request at lists.re-wrenches.org
>> <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 <http://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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