Nov 6, 2021, at 9:18 AM, Bill Hoffer wrote:
>
>
> Jay
>
> That is possible. Also the sorted cells are packaged in boxes that do not
> match the number needed per module (and there is always some breakage
> during soldering and layup) so it is likely that they are mixing lots
any OEMS outsource cells, is it possible the cells came from different
> cell companies?
>
> Jay
> Peltz power.
>
> On Nov 5, 2021, at 7:27 PM, Bill Hoffer wrote:
>
>
> Like any manufacturing process there are variations, especially solar
> cells, regardless of typ
guessing the lower quality guys are not holding their
suppliers to the same standard QC. However I have no data to verify that
and like I said probably not a serious hit in performance.
Bill Hoffer
On Fri, Nov 5, 2021, 3:50 PM Jason Szumlanski <
ja...@floridasolardesigngroup.com> wrote:
> I'
. That was
why I opted for railess, since the cutting of rails would have been very
time consuming.
Bill
Bill Hoffer PE
NABCEP Certified Solar PV Installer™
Sunergy Engineering Services PLLC
420 SE Wyers St ,# 1823.
P.O. Box 1823
White Salmon, WA 98672
bhof...@sunergyengineeringservices.com Cell:(509)679-6165
Jay
Not sure what you are implying by this comment. I do not believe that
glass is pre bowed by any glass manufacturer that I know of nor on purpose
by a module manufacturer. Glass is manufactured shipped and stored flat on
a pallet. How were the modules Shipped? If glass down with no packing
It is actually better for minimum shipping damage stacked on their sides.
There is a right side to start removing and a really wrong side which you
will know immediately! Usually marked start removing this side, follow
manufacturer instruction when in doubt. I am not familiar with Mission,
but
Corey
I consulted and did some independent tests with a module manufacturer who
had some modules with low Power output and curve traces similar to yours.
They however could detect no abnormal cracks in the modules with EL
testing. I also detected no issues on the thermal image at no or low power,
Jay
Just finished using S5PV railess on standing seam roof 12x12 pitch. Worked
great, but wire management was challenging with minimal clearance under
modules. Had to think ahead to make it work. And still was a struggle. I
also used 6 rather then 4 per module to even out the loads on the roof
thought
of?
Bill hoffer
On Feb 28, 2018 8:15 AM, "Daniel Young" <dyo...@dovetailsolar.com> wrote:
These issues are not lost on me for sure. I have to plan out a new
protective setup to try to ensure that if the temperatures drop and the
battery bank hits LVD, that the array ca
Jay
Just copper stock is not good enough necessarily...make sure it is
specified for electrical current carrying. I have seen some spectacular
failures with people using plumbing pipe malled flat and drilled. It is
was too soft to handle the heat at high currents! I do not know the exact
Matt
I believe that Itek Energy will be shipping either June 1 or July 1 with
Tigo ready modules. Please contact contact Karl Unterschuetz -
ka...@itekenergy.com about sales. They are calling for a pre-order since
they are transitioning from their old junctionbox to the Tigo. Tell him
Bill
thermal shocked them washing
them off I am sure that they would find a clause in their warranty to
weasel out of it!
Bill Hoffer
On Wed, Feb 1, 2017 at 6:19 PM, frenergy <frene...@psln.com> wrote:
> Drake,
>
> I am no expert, BUT, about a year ago I covered an older
&
Rebekah
I am not 100% sure but I think that there is often confusion between max
fuse and max reverse current. When you list a module you request a fuse
rating , in this case 4 A and UL will test it by applying a max reverse
current of 1.75(max fuse rating) or 7 Amps with out a fuse to insure
Jay
I believe that is the same. I hate that they say it that way...very
confusing. I think it comes from the way it is tested by UL. They reverse
current at 1.5 times the fuse rating to insure the fuse size is correct
(fuse plus safety factor).
Bill
On Mar 18, 2016 6:56 PM, "jay"
WA Silicon Energy has been shut down for almost a year now, leaving behind
a lot of warranty claims for delaminated modules. Not a pretty picture at
all. Hope you have only the first generation modules, before they went to
a thinner lamination..
Bill
On Dec 18, 2015 3:51 PM, "Solar"
Bill
Performance verification would be your first test that can be done with 2
clamp on meters ( idealy two Power meters like the Seaward Clamp Power
Meter ) , ie testing under load knowing the irradiance and cell
temperatures and measuring watts in and watts out of the inverter. With
that data
systems it is occurring more quickly.
Bill Hoffer
On Thu, Jul 16, 2015 at 10:33 PM, jerrysgarage01 jerrysgarag...@gmail.com
wrote:
Wrenches
We used to use Sharp but now its Trina, containers of 250 watt modules,
data logging has not shown any abnormal power loss. Now that I say this
Trina
Dana
I highly recommend the Power Quality Clamp meter. My most useful meter, I
will never buy just a plain old clamp meter again, for a few dollars more
having the ability to measure ac/dc power directly is huge! I have had the
Seaward Power Clamp for several years now, when it was the only
the
grid tied inverters is regulated allowing for healthy multi stage
charging.
Another thing to consider if using the Outback Ac coupled solution is that
your DC coupling options becomes limited in the same load center
Cheers
Kirpal
On Jun 30, 2015 9:01 AM, Bill Hoffer suneng...@gmail.com
Kirpal
Actually the Radian system does adjust the battery voltage point that it
disconnects the grid inverter based on the stage of the charge timers using
the 3 stage inverter charger set points. The FNDC will also over ride the
timers if all fully charged parameters are met. It has the
Benn
I personally would not accept these modules, the defect is what you can see
and makes me wonder of how good the remainder of the soldered connection
is. It is a red flag and very likely will become a problem in the future
under load thermal cycling. Shading of the cell is the least of the
Howie
I am biased to SEI. Full disclosure I do teach for them. Great instructors
and a solid curriculum. Options for online, in person and hands on. Great
thing about SEI is most instructors are part time teachers working full
time in the industry, so students get a good industry perspective.
Eric
Try Lumos Solarscape http://www.lumossolar.com/solar-products/solarscapes/
s
Bill
On Thu, Mar 19, 2015 at 8:33 AM, e...@harvesthesun.com wrote:
Anyone have a recommendation for a PV module that doubles as a skylight,
i.e., has a clear backsheet? I have a client who would like to explore
Marco
TUV can test to UL1703 standards not just IEC standards. UL still trys to
make a big deal about the UL mark vs all other testing labs, but any NRTL (
Nationally Recognized Testing Laboratory) can certify to UL standards. The
mark is what counts and it will state specific standards tested
Christopher
There are some level of micro fractures that are always present in cells
and not visible to the naked eye. Some of these will produce visible
fractures over time from loading and flexing of the module from weather and
temperature changes. The micro fractures can be an issue with
Bill
Flir E40, works well and has some good features that make it easy to write
reports with the software. E60 is similar with additional features, but a
little more expensive. IMHO any of the E - series is a pretty good bet.
Bill
Sent from my Verizon Wireless 4G LTE DROID
Bill Loesch
Mark
Loaded modules will have hotter cells. I know this from searching for bad
cells with a thermal camera. At open circuit I could not see a difference,
but short circuit or loaded I could see 20 - 30 C increase in mismatched
cells .
Bill
On Wed, Sep 10, 2014 at 9:43 PM, Mark Frye
Ron
A silicon based spray sealer should work, just make sure whatever you use
is air cured and not accelerated cured by using acetone or some other
solvent that may get trapped and eventually cause corrosion of the cells or
cell interconnects. Even if it buys you a couple of years that is better
William
I agree with Bob-O, wire nuts are not the best choice for DC connections,
for all the reasons he mentioned, but SMA claiming that wire nuts are
causing arc faults seems like a long shot at covering up an arc fault
detection nuisance tripping problem. IMHO AFCI protection circuits are
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
Dave
I agree, in the case of microinverters, you already have a main PV System
disconnect at the Load Panel to shut down the system that is readily
accesible. I would consider the disconnect on the roof as a supplemental
disconnect for the purposes of maintenance by authorized personal that only
James
It is probably a Silane solution ( Silicon based), it is commonly used for
skyscraper windows to insure that the Very High Bonding (VHB) tape used to
adhere them is not undermined by water intrusion I have also seen it used
in solar modules on the edge of the glass prior to lamination to
Dave
Sometimes tempered glass will have a defect that will cause spontaneous
breakage from a relatively small stress in exactly the right spot. We
have seen that happen during module manufacturing, so usally it never makes
it out the door. What does the shatter pattern look like. If it is from
William
I second using Sketchup and Layout for $500 . I have seen the add on Roof
Pro Plug in and Skelion ( $199) demo that lays out the array and links to
PVwatts for power analysis. Plus Combined with google earth , does great
shading analysis I. I think you can do a quick design in an
Ray
Gave up on stainless fasteners and anti-sieze a long time ago after
discovering Dura-Con Fasteners http://www.duracon.info/p/why-dura-con.html.
Better corrsion resistance against aluminum than stainless and no galling!
We have used them for training where systems are assembled and
Tump
Try
Silevohttp://silevosolar.com/category/product/cells-modules/triex-solar-cell/,
they are currently making a 125mm 72 cell module in China. This is thier
36MW proof of concept plant ( lower cost HIT technology like Sanyo ,
cystalline cell with amorphous coating giving higher efficiency
Chris
I have had great luck with PV
Cableshttp://www.pv-cables.com/Custom_Cables-Create_a_Custom_600V_USE-2_Output_Cable.html.
Quick service and reasonable prices. They do have MC-3 connectors and
custom made cables.
Bill
On Fri, Jan 31, 2014 at 11:01 AM, Chris @ The Oasis
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the
rest and in quantities of 500 buy direct for $.28 - .29 each depending on
the style. They are open to custom design ideas, made in the good old USA,
and customer service was outstanding too!
Bill Hoffer
Sunergy Engineering Services PLLC
On Thu, Nov 14, 2013 at 11:08 AM, Jason Szumlanski ja
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Dyno Rack tool less best flat roof ballasted!
Bill
On Sep 10, 2013 2:12 PM, Jay Peltz j...@asis.com wrote:
Sub question/
Best ballasted flat roof rack?
Jay
Peltz power
Sent from my iPhone
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Greetings Fellow
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Andrew
I highly recommend any of the fluke E series. Better resolution and you
can get accurate temperature measurements at a safe distance from live
circuits. IMHO , any lower model, you will wish you could do more! I also
recommend Solar Energy International's Advanced tools lab, a week of
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Also realize that most chaulks use acetone to cure faster, not good for
back sheets. PV adhesives are air cured and take a lot longer to become
full strength, at least 24 hrs under ideal conditions! PV804 is bomb
proof, I have done adhesion tests on junction boxes And I literally had to
destroy
Don
Actually Very High Bond (VHB) foam tapes are incredibly strong and if
formulated for glass, will work quite well. They have been using it for
decades to mount heavy glass and aluminum panels on curtain walls on sky
scrapers. I would trust it totally as long as it was not bought at
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*From:* re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] *On Behalf Of *Bill
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*Sent:* Wednesday, February 13, 2013 5:03 PM
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*Subject:* Re: [RE-wrenches] Seaward Solarlink
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Ryan
I do not think that they have a 30 degree option, but I have been pretty
impressed with Dynoraxx http://dynoraxx.com/tool-less approach and using
fiberglass non-conductive material ( read no grounding of racking). Now
all we need is a fiberglass non-conducting module frame!
Bill Hoffer
Jay
Seems to be the preferred method in salt spray environments like the South
Pacific Islands! Copper and Aluminum don't play well together under those
conditions
Bill Hoffer
On Mon, Aug 27, 2012 at 1:04 PM, Jay Peltz j...@asis.com wrote:
Hi Brian
Isn't another way to go:
Use the AL lugs
on that site but none called structural.
Thanks
Chris
On Mon, Jul 2, 2012 at 7:08 PM, Bill Hoffer suneng...@gmail.com wrote:
Mark
Lags for me are old hat after using the newer structural screws. I get
them local from www.screw-products.com although I know there are more
companies out
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Mark
Try http://bluefrogsolar.com/wa-made-solar-products I believe that they
are now shipping a Washington made micro inverter. There is one other
microinverter, but I do not believe that they have passed UL yet and have
not gone public.
Bill Hoffer
Bill Hoffer PE
NABCEP Certified Solar PV
writing warranties that give them an out.
Any info on what products have done well ( or not) and best practices to
minimize corrosion issues would be very welcome.
Thanks
Bill
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not see how the added
features can be cost effective. IMHO, I am not convinced that this
inverter is really doing what they are claiming, however I would love to be
proved wrong!
Bill
Bill Hoffer PE
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Sunergy Engineering Services PLLC
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East
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Beware!
Thanks for any and all comments
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it , more power to you, but don't whine to me about it being
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Bennett
I have a roof similar to the one you described. It was designed for
coastal regions of Alaska, heat-freeze cycling and high winds. Roofer
warned me that I better plan my penetrations because after season in the sun
I would never be able to lift the shingle again! That being said have
Lee
I worked on a job on Washington pass in Washington state about 12 years ago,
near the border of Canada in the North Cascades wilderness area. Design
snow load was specified 200 #/sq ft as I recall (far greater than the forces
on a module at 120 mph wind load) and the Cascades are known for
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