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:* [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] *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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