Hello wrenches,
Does any one recognize the controller in the attached photo? It is a
SolarJack brand. The caretaker thinks its a pump controller but I'm not
familiar with this controller or the site in general. The homeowner
thinks that it has gone bad. Any suggestions?
Thanks
--
Mac
Dave,
I can't identify your hardware, but I just wanted to comment on your
comment about hitting rafters. There are products out there that can obtain
the requisite load ratings without connecting directly to structural
members. We have had systems engineered and permitted using Ecofasten
Hi Mac
Try Sunpumps.
Jay
Peltz power
On Jun 3, 2014, at 5:55 AM, Mac Lewis maclew...@gmail.com wrote:
Hello wrenches,
Does any one recognize the controller in the attached photo? It is a
SolarJack brand. The caretaker thinks its a pump controller but I'm not
familiar with this
Jason, thanks for the comment! I agree that systems could connect to
just sheathing and stay on the roof- I think Zilla has a product that
does this too. My concern about wind resistance stems from the fact that
there appeared to be an engineer's stamp on the Unirac calcs with lag
screws and
That does look like the early Unirac system, (I don't think they rated it for
140 mph). It wasn't designed to hit rafters, that's why there six screws in
each base plate….
Max Balchowsky
Design Engineer
SEE Systems
1048 Irvine Ave Suite 217
Newport Beach, Ca. 92660
760-403-6810
Building a
Friends:
I see two issues: Strength and sealing:
Strength: I have researched sheeting attached roof mounts. Direct Power
has their Easy-feet product. It relies on a specific fastener made in
Canada. I contacted the screw manufacturer and they disputed the claims DPW
made. Their
Have you checked out Eco Fastens ECO-65? It's a large plate with 8 screws and
it's got flashing for both asphalt and membrane roofs.
From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf
Of will...@millersolar.com
Sent: Tuesday, June 03, 2014 12:09 PM
To: RE-wrenches
I mentioned to Dave off-list that Sunmodo has a 4-hole base with
corresponding flashing that looks very promising.I like the product for
several reasons, especially being able to get two lags per attachment into
a truss.
In every case we leave it up to the engineers to determine the number of
Dave, I have several of these kicking around (or had). I do think that
it is an old Unirac product. The ones we have (had) though, have lag
bolt holes along the long central axis about 3/4 from the raised
mounting surface. Chris
On 6/3/2014 11:11 AM, Dave Click wrote:
Jason, thanks for the
Hi Wrenches,
Does anyone know what percentage of module degradation over time is voltage
and what is current? I'm wanting to make sure we give ourselves plenty of
breathing room on the minimum Vmp of the inverters over the long term so
need to try to anticipate how much voltage we'll lose on the
Read this article from SolarPro:
“Array Voltage Considerations”, SolarPro Magazine, October/November 2010, pp
68-78.
Bill.
From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf
Of Dana Brandt
Sent: Tuesday, June 03, 2014 3:42 PM
To: RE-wrenches
Subject:
Dana,
Excellent question.
More than 20 years of PV degradation research conducted by NREL and others has
shown the dominant loss to be in the Isc and fill-factor aspects of PV
performance due to increasing effective series resistance. Voc stays
essentially stable over the life of the PV
Dana
Bill Brooks, passed on past data, ( correct me Bill if I am out of date
here) recommends 1% Power loss per year with approximately 0.5% current and
0.5%voltage. That is also what Solar Energy International Best Practices
curriculum recommends. Based on some newer data from larger projects
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