[RE-wrenches] More on AC coupling
Matt Tritt
solarone at charter.net
Wed Nov 26 16:40:46 PST 2008
UB right, Tump. These things aren't exactly something you will ever find
at Home Depot! BUT, and it's a big one, if you count all the %$!#& time
and energy usually required to design, fabricate and re-design a really
good off grid system, the extra money might just be woth it. ;-)
Matt T
Tump wrote:
> 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
>
> -----Original Message-----
> *From:* re-wrenches-bounces at lists.re-wrenches.org
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On Behalf Of
> *Matt Tritt
> *Sent:* Tuesday, November 25, 2008 9:21 PM
> *To:* RE-wrenches
> *Subject:* Re: [RE-wrenches] More on AC coupling
>
> I am curious as to why OutBacks were used for this system instead
> of using SunnyIslands and SunnyBoys? From what I can tell about
> the SI system, virtually no aspect of battery charging, auto
> gen-start/stop, and interactive inverter control has been
> overlooked - or remains to be engineered in the field by the
> installer. Because SunnyIslands have the ability to "talk" to
> Sunny (or Windy)Boys, excess energy is taken care of by
> "integrated load shedding" - no need for multiple relays, dumpoads
> and voltage sensors. :-) The only limitation to these systems (and
> only in 60 Hz land) is a maximum of 20 kW single, and 15 kW three
> phase per autonomous load. I really like the flexibility of being
> able to connect all AC inputs on the same line, as well as having
> the option to do direct battery charging from a DC source (as long
> as you use a shunt to measure current).
>
> I know this doesn't answer your questions, but for similar
> applications in the future it would be good to take a close look
> at the SunnyIsland system. They're cool.
>
>
>
> Matt T
>
> Mark Dickson wrote:
>
>> Hello Wrenches,
>>
>> On the heels of the previous thread:
>>
>> We just got finished installing a system that utilizes an Outback
>> Quad stack and a 5.2kW array coupled to the AC panel via a
>> Fronius IG5100--due to a long home-run. The VFX's are wired into
>> the home in their traditional manner, providing the "grid" for
>> the Fronius. As the solar comes in, excess power not used in the
>> home back feeds the batteries through the VFX's. I have a series
>> of relays operating dump loads and finally a power cut-off for
>> when the batteries reach critical level. We installed the system
>> yesterday and turned it on for a test run (then back off to power
>> it up in 2009 for the ITC's)--it worked great!
>>
>> I have a couple questions for you all:
>>
>> * Seems how we are back feeding the inverters and forfeiting
>> their charge control, where would you set the dump loads to
>> kick on?
>> o For now I have them set at: 1^st load to kick on at
>> float voltages, 2^nd to kick on at bulk voltages and
>> 3^rd to kick the solar power off at the EQ voltages.
>> Does this make sense? The bank is made up of Rolls
>> 4ks-25ps batteries.
>> * Following a recent discussion on the Wrenches list with a
>> similar system: Do I need to worry about back feeding the
>> generator if it is runnin in the morning when the sun comes
>> up? Do I need a relay that will shut it down when solar
>> comes on line?
>> * I plan on setting the Absorb and Float set times to a
>> miimum. Would you recommend this?
>>
>> Thanks for your input!
>>
>> Mark Dickson
>>
>> Oasis Montana Inc.
>>
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