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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