Troy,
I would try looking at the Sunny Island by SMA. I have had good
experiences using them as part of a grid connected battery back up system.
Though I haven't yet used it, they have a pretty intelligent load shedding
system through their programmable relays. The main drawback is that it
puts
The tax credit applies to SYSTEMS, not replacement components
..
Northern Arizona Wind & Sun - Electricity From The Sun Since 1979
Solar Discussion Forum: http://www.wind-sun.com/ForumVB/
..
Generally I agree that it applies to systems, but a case could be made
fairly easily for a significant upgrade. IE, more PVs plus an upgraded
CC, larger CBs, etc. If you threw battery replacement into that mix I
think it would fly as a system. I agree that batteries alone probably
won't do
Troy,
If "cost is not an issue" and you only have 50 amp load, sounds to me
like you don't need to shed loads at all. Just design the battery/
inverter system to handle this. Build a 20kW Sunny Island system or
perhaps a pair of Outback series/parallel Quad Stacks, 28.8kW (see: http://www.ou
Oh, I see... they want self applying
lipstick on their pig... (sigh)
Todd
Troy Harvey wrote:
I've got a high-end customer who doesn't have the interest
in knowing the details of managing "manual" load shedding. He wants
something that works... period. At one point Gridpoint advertised
thi
Troy,
Unless you are going to be your client's power plant manager, he or she is
going to have to be responsible for at least system operation which means
managing production and consumption - or hire someone to manage the system. PV
systems are automatic and virtually maintenance-free to some
I've done this on a couple of mega-homes, where load shedding is the only
option to manage loads that exceed the most massive inverter stack possible. As
w/your customer mine did not care for any interface at all and in both cases
they are thinking about rental when away and know that guests wil
Hi Joel,
The system I designed at the Real Goods Solar Living Center was been grid-tied
and on battery back-up for 13 years now, goes back to the non net-metering days
and 2 meters. I did a whole "house" back-up with 2 SW5548's on the lighting
panel and 2 SW5548's on the plug-load panel. PV is a
Hi all,
Has OutBack licked the multiple stacking UL listing yet? Can we hookup a
quad stack now to the grid? We would be looking at doing a 120/240 VAC
single phase setup with two inverters per leg.
Sincerely,
Chris Worcester
NABCEP Certified PV Installer
Phone: 530-582-4503
Fax: 530-582-4603
Hi Jeff,
Was that the Living Center PV system configuration before or after the flood
and fire? Was the Fetzer Winery PV system also with 2 meters?
Cheers,
Joel
- Original Message -
From: Jeff Oldham
To: re-wrenches@lists.re-wrenches.org
Sent: Wednesday, June 24, 2009 10:41 AM
Wrenches,
We are doing a partial donation project for a school and were planning to clear
out inventory by using 8 x SWR2500U units. But alas, we only have 7 on the
shelf.
If anyone has one of these inverters they'd like to get rid of, we'd like to
buy it. Please contact me OFF LIST.
Th
All of the OutBack inverters have a programmable mode for the AUX OUTPUT
which will turn off AC loads when the inverter reaches its AC output
current limit or if it gets too hot (i.e. is overloaded). This mode is
called "DIVERT-AC" and is in addition to a "DIVERT-DC" mode which is
similar except t
Recently we've had a few modules (~5 year old) exhibit frame
separation from the glass...
in one case, it's minor separation of the long edge of frame on one or
both sides of a few modules... the frames seem okay and reasonably
secure when attached on the roof, but were loose during handling.
William,
The main concerns are physical damage to the unsupported laminate and
moisture penetration at the exposed edge of the laminate. If the frame can
be pushed back in place without breaking the laminate, you can fasten a flat
bar across the back of the module to keep the frame in place. E
Be careful with the silicon. Most of it is
hygroscopic, and contains acetic acid.
Automobile windshields are often secured with Butyl rubber caulk. It
is impervious to moisture. Might this be a good choice? I also wonder
if a polyurethane (like sikaflex) would be appropriate.
See Ya!
Mar
Marv,
Not to split hairs, but silicone not silicon. Silicone based brake fluid is
used because it is non-hygroscopic. Hydroscopic is the ability to absorb
moisture from the atmosphere. Silicone bathtub caulk is not hydroscopic and the
acetic acid in the caulk will not hurt the solar laminate gl
Joel,
Are you sure that water can enter the laminate from the edge? My understanding
is that the aluminum frame is only needed for structural support, and that the
laminate itself is sealed at the edge. I'd like to know if I'm wrong. Maybe a
module manu rep can chime in.
How are frame-less lam
William,
I have done the procedure before.
I used RTV silicone.
The hard part was cleaning out some of the old sealant in the frame.
After seeing enough modules that look like they were sealed by
preschoolers, you might end up with a longer lasting seal than the
manufacturer.
Doug Wells
The
Not meaning to open up a can of worms, but along these lines, what do y'all
think of the way Sharp frames are connected/sealed?
Chris Daum
Oasis Montana Inc.
-Original Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of
Brian,
I was general manager of 2 solar factories. There is lots of literature
about EVA and moisture. For example
http://www.nrel.gov/docs/fy02osti/30841.pdf
I am sure moisture (H2O) can enter laminates from the edge. EVA does not
protect the cells from moisture. EVA provides a path for moi
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