Ray,
With over 25 years of installing off grid PV systems I feel like
Generac is the only company I've seen who has looked at the needs
(cost,reliability, stable output, auto start, 120 VAC output) of the
small to medium size off grid PV system and designed an affordable and
so far seemingly
We recommend propane to all our clients in New England simply because
in the winter a propane gennie starts without the need for a block
heater or special diesel storage. Reliability is preferred over price
when it comes to needing charging after a week of cloudy, snowy
weather. Many of my
SnapN Rack gets my vote. Great for wire management, good pricing and ease
of install. We've tried a lot of flush mounting solutions over the years
but if I went back to most of them (or discontinued using SnapN Rac) my
workers would mutiny!
Daryl DeJoy
NABCEP Certified PV installer
Penobscot
Hi Kirk,
Take a look at this...http://powerwisesystems.com/emonitor.html
They are made in Maine and seem to be what you are looking for. Not
sure of the price
Daryl
Hello,
Does anyone know of a user-friendly monitor, using non-intrusive CT's, for
measuring real-time kw and
Thanks for the reply guys. Yes, the utility is saying that it will be at
the customers cost run three phase that mile or so. It is prohibitively
expensive with the clients business plan. My thought is that multiple
smaller, single ph inverters could be used to then tie into a transformer
which
Hello fellow wrenches,
I am hoping someone here has come across this before and might have a
suggestion or two for us. I have a client who has a large piece of land
and the financing for a 500 kw solar farm in Maine. The predicament I
am in is that the closest three phase primary is more than a
I donated some 12 watt solar panels to the local grammar schools in my
area and got a call from one of the teachers with the same question. The
panel was very over sized for the project, but simply taking a small dc
fan (or a d motor with blades (propeller?) attached, combined with a
colorful
Alan,
Ditto to Bills last post. I always require a load evaluation as it
imposes a certain amount of personal responsibility on the part of the
off grid customer. Two years from now when they call you and tell you
they think there's something wrong with their system you can take that
load form
I recently built a new home for myself, earth bermed and of course,
solar powered (and soon to be solar heated). Every light source in the
home is LED. I did a lot of homework, testing bulbs and different
fixtures, and am very happy with all of what I decided on. Kitschler
makes excellent,
Chris,
We had a problem similar to this in the Bahamas, only with a Radian
instead of an
FX series inverter. We used an Acme transformer, 3 ph 208 on one side,
single phase 120/240 on the other end. It was about $1200 for the
transformer. Acme is in Tennessee I believe and we worked with one of
Hi Holt,
We installed a commercial system a year ago for the National Park
Service that was designed by a competitor (?) and signed off on by an
engineer. It consisted of 13.2 kw of pv and two Fronius 7000 watt, 208
3 ph. inverters. It sounds a lot like what you are dealing with. I
questioned
Hi William,
We have experienced this at one installation using 22 M-215's. There is
not yet a conclusion, but here are some things worth looking out
for.I printed out a spreadsheet of the incidents and noticed over a
one month period that they were all happening at either 8:30 am or 1
pm,
Try SolaDeck, Rich. It has a din rail inside for mini breakers and a
ground as well. We use them all the time with great results.
http://www.rstcenterprises.com/soladeck/
Daryl
Wrenches,
We typically run conduit for roof mounts over the edge of the roof to the
eaves, rather than penetrate
Chris,
We use Eterna-Bond on all our installations, New England and Caribbean.
Great stuff, and it comes one side sticky or two. We keep a couple of
rolls of each on the truck at all times.
Daryl
I am putting an attachment base on painted metal trapezoidal roofing and I
want to put double
Hi Howie,
Having installed a half dozen Radians so far I have gotten comfortable
fairly quickly with the Mate3. It is much more intuitive than the
original Mate and uses a touch pad similar to an Ipod. I have had an
issue a couple of times not being well grounded and the touch pad was a
bit
We have our first order in for Helios 250 watt modules. I have been
reticent to sell Chinese modules while my surrounding competition is
selling them regularly. I am not against the principle of a world market,
but I do not like the lack of environmental regulation in many countries.
It does seem
It would need a GTI (grid tie interface) in order to comply with UL 1741.
There might still be some available (Ebay, etc.)
I used one made about that time in our home back in . It was the first
grid-tie in the county and worked flawlessly for about ten years before we
sold it. While it was
Hi Bill,
I worked in Haiti this last year for a couple of months with an NGO and
installed a donated system. Customs took almost ten months to allow the
solar panels to pass through. They sat in customs through two different
trips down. There is much corruption and many scams. There is a
http://www.acetoolonline.com/Custom-Leathercraft-1530-43-Pocket-Tool-Bag-p/clc-1530.htm
This is the one I use. I don't like using a tool belt at all if
possible. Myself and my workers all use tool vests with large velcroed
pockets for essentials. Tool vests work really well as long as they fit
We use a CLC (carry lotsa crap) bag from Home Depot. The one we use has a
long carry handle as well as shoulder strap, is about 18 inches long and
does what it should. The one I've been using is about 5 years old now.
Veto Pro Pac XL
Love it! Except the outside measuring tape holder
We've seen this type of problem twice with well pumps. Both times, the
problem was with a short in the load side close to the pump. One was
occasional, the other constant. Interestingly, running a large generator
seemed to fix the situation to the customer. In both cases, we found the
short,
We use Direct Power and Water racking for ground mounts. They're
engineered for 90/120 mph winds, depending on where you're installing.
The two tier mounting is especially nice.
Friends:
I am curious about what the rest of you are using for off-grid ground
mount
racks. We need a tilt
I'm going to try the Magnum ME-AGS-S. Thanks for the recommendations, guys!
Daryl
I must second the recommendation for the Magnum Energy AGS-S. Excellent
product, great customer support. Works with most simple 3-wire generator
controls.
We also sell the Atkinson Electronics GSCM module
I appreciate that William. The problem is that the system is in Culebra,
an island off Puerto Rico. The homeowner is only there for a week at a
time about four or five times a year. It gets regular and complete
charging from the 5 kw array. The problem is that his AGS is starting the
generator all
I was lucky enough to cross paths with Richard many times in my career. He
was an enjoyable and intelligent guy and I know those who knew him, my
self included, will miss his quirky and sometimes off beat sense of
being
Daryl DeJoy
NABCEP Certified PV installer
Penobscot Solar Design
I'm not sure how many Radians you can stack, but they are a great
inverter. Exeltech also makes a buildable line of inverters and you
might ask Dan there about them. I also think Apollo is coming out soon
with the ability to stack multiple inverters to get there.
The redundancy of stackable is
My home is 100% LED lighting, Kitchler undercounter, non dimmable Philips
Earthlights in closets, dimmable (might help with grid events...) Philips
Earthlights for the rest of the inside lighting and I am very happy with
all of it. Anything from warm white to daylight is available. They are
more
We've also used the larger Burndy insulated blocks. Busbars can be tricky
when they are not insulated and the Burndy blocks have configurations of
up to six (I think) conductors and in larger wire sizes.
Midnite has a new one:
Here's one of the 6 port Burndy blocks for up to 600 kcmil, with spec sheet:
http://www.burndy.com/site-search.aspx?cx=002899303449139187703%3Ae9jb50hrnuccof=FORID%3A10ie=UTF-8q=insulated+blocksSearchType=PartNumbergo.x=0go.y=0
I've also used the big Polaris insulated tap connectors. I used
We are currently in Culebra installing a pv system with two Classic 200's.
Its a great controller to set up and install. While snow melt is not
important here, i did notice after using the setup wizard that it mentions
future new features with the snow melt function being one of those
mentioned.
Impressive, Bob, but if one 125 watt panel took 1000 watts of power, what
is it going to take to melt my two 1600 watt arrays, pole mounted,
(theoretically, of course, and at a 65 degree tilt)? Just wondering as
it seems a lot of power to use in the winter for an off grid or solar
reliant
Hi all,
We are looking at a busy winter season and there are several systems
I'd like to size using OutBack's Radian. These are all out of the
country jobs and I would be interested in any experiences anyone has
had so far installing and/or using these seemingly great inverters.
I would
Thanks Orion,
Most of our work in the winter is in the Caribbean and Mexico and they
all use 60 hz. I appreciate it, though.
Daryl
Daryl,
We have not had any hands on experience yet with the Radian series
inverters, and only minimal interaction with the MATE3. But since you
mentioned
Ian,
We have been using this companies products for the last couple of years
on different types of metal roofs with success (so far). Look at the
variety of products they have for different roofing:
http://www.ecofastensolar.com/our-products/eco-series
Daryl DeJoy
NABCEP Certified PV
I have used a Premiere Stainless steel Pro Series model at home for the
last year and I am very pleased with its performance.
Daryl
We haves sold these units years ago, but have stopped due to poor
quality. We had one ourselves and just got rid of it to save my marriage!
My wife hated it.
Ron,
I'm going to reiterate what Jeff says here. It is similar to what I had
said in my email. The charge rate must REGULARLY be C10 on the KS
(5000 series) batteries. This means, on KS 25's, a routine bulk
charging rate of 135 amps. I find that on these types of hybrid
systems, while the
Ron,
What comes to mind for me is that Surrette 5000 series batteries like
to have a regular charge of C10. KS25 cells are rated for 1350 ah,
creating a need for a somewhat regularly occurring charge of 135 amps.
I do believe the batteries are not ever getting that, except for very
rare
Jonathan,
Close to half of the systems that we installed that I previously spoke
of using the Federal Tax Credit used batteries. I believe if they are
installed as part of the initially installed system that they qualify as
just that and receive the full 30%.
Daryl
Can any say for sure if
I read your post and I am far from an expert on tax issues, but one thing
I am sure of is that the home does not have to be the primary residence.
We have at least a dozen clients whose summer homes have benefited from
this incentive and early this question came up. All of these clients have
since
Thanks for that Allan,
I should add that there does not appear to be any cracking of the cell
to the customer when compared to non-effected cells. It is just that
strange shape ,shading , design underneath the glass on that
particular panel and cellsthis is according to the customer, who is
Never heard of anything like that...a solar urban myth perhaps? At least
for now.?
Daryl
htmlbodyspan style=font-family:Verdana; color:#00;
font-size:10pt;divThat one is news to me but I can see a small value
in it as an upgrade path.br/divdivbr/divdivLarrybr/div
blockquote
Ray,
The nice thing about the Exeltech (and what made me decide to use
them) is that they are not large. They are simply an array of 1 kw
inverters, allowing for multiple redundancy. Essentially, a 30 kw
three phase inverter is 31 small inverters, which, with the removal of
two nuts, can be
That has been my experience as well, Drake. Typically in these Enphase
installations the 3R rated box is mounted under the last panel in the
string and attached to the rack. This makes it very unlikely to ever see
wet conditions when properly installed. As we all know, ultimately the
We use Burndy insulated blocks for transitioning with Enphase. Inside the
connector they use the same blue silicone that is used in the wet rated
twist on's only with a pretty reliable long term connection.They tighten
with a hex wrench. They aren't cheap, but security rarely is. They are
also not
William,
I believe this is the line of insulated multitap connectors:
http://www.burndy.com/products/product-by-category/mechanical/mechanical-aluminum.aspx
Daryl
Daryl:
You got a part number on those connectors (and a link to a web page)?
William
At 11:56 AM 10/20/2011, you
Sorry William. There are indoor and outdoor rated connectors there. The
outdoor are a bit larger, but I think you have got the right one.
Daryl:
Thanks. The link indicated a broad category of connectors. Apparently
when you copy a link for a specific product it takes you back to the main
I'm surprised that more wrenches don't use Apollo's T80HV. It's a solid
unit that seems to perform at least as well as competitors. We have many
of the regular T80's installed in the Caribbean that have proven very
reliable. 5200 watts of PV for a 48 volt system is pretty darn good in my
opinion.
We use ss anchor (L) bolts when we need to bolt to pillars. Remember to
use an anti seize compound when installing initially.
Daryl
This is an amazingly timely post for me! I was just thinking of asking
the
same question since i have a couple of ground mount installs coming up
with
And I would agree with Ray's reply. We install on islands in Maine, the
Bahamas, Lesser Antilles, USVI and Mexico, almost always within 150 of the
ocean, and high quality stainless won't react negatively with aluminum, at
least compared to other metals. I have seen galvanized zinc fasteners
rusted
Dan,
Is the Xantrex controller available/released yet? I've used the Classic
250 and the Apollo HV but have yet to see/use a Xantrex 600 Voc
controller.will anyone who has used one chime in and share their
experience ?
Hi Eric;
I'll be very interested to hear what others on this list
Hi Eric,
Look at your design parameters. There is no reason you can't run DC
250'. You are better with some small amount of DC loss than with AC
loss, particularly if you intend to sell back to the utility. Use a
Classic 250 or 200 or Apollo Solar's T80HV. You can configure your
panel series
Hi Jeff,
There is no doubt that aluminum will stand the test of time better in a
marine environment than galvanized steel. The galv. will show rust in
an amazingly short time. We have had DPW marine grade aluminum mounts
within 50 feet of the water in the Bahamas installed now for more than
ten
Thanks for reminding me RayJeff, we use ss transition boxes instead of
pvc. You can find 6x6x4 or 4x4x4 boxes for a reasonable price considering
their superiority when it comes to longevity. Obviously use at least 3R
rated boxes at a minimum.
Daryl DeJoy
NABCEP Certified PV installer
and if you're considering a panel for the Bahamas be sure to make sure
they don't void the warranty for a marine environment...read the small
print!
The Canadian Solar CS6P's and SolarWorld 245 Monos are rated to 113 PSF.
I don't really like the 31MM frame on the SW from a wind/snow load
its a busy Wrench List day for meWe have many REC's in the Bahamas
for that reason Jeff. Both systems on Cat Island that we had were hit with
130 mph winds by Irene and except for one charge controller getting wet on
one of the systems, they both survived. One system was roof mounted, the
I have just started dealing with 1SolTech, manufacturing in Texas, and am
impressed with what I see so far. I am using them to replace the Sharp's I
had originally intended to use on a job in Mexico. From others on the
wrench list, it seems the warranty is void if the Sharp panels are
installed in
I'm with you Carl. Gotta love the Soladeck!
Daryl
Penobscot Solar Design
Jesse,
Another good option is the Soladeck. If you don't splice inside it you
can
actually hide it under the array, making an uber clean look. Seal it down
with Eternabond or similar product.
Carl
On Sep 10, 2011
Just wondering what everyone (anyone) whose used these Sharp modules
thinks of them for salt air environments? Does this lack of seal
compromise their ability to hold up in this type of environment? Any first
hand experience out there?
Daryl DeJoy
NABCEP Certified installer
Penobscot Solar Design
Twenty years ago 100% of our installations were battery based, off
grid. That is all there was, at least here in Maine. Nowadays, we are
installing about 75% grid tie. Of that, about 25% use batteries in
their system with a critical loads sub-panel. The remaining 25% of
our clients are off grid
Darryl, Bob and everyone else who helped,
After careful consideration and much research and advice from all you
wrenches, my decision is to use Exeltech MX series inverters. They have
an almost tailor made solution for this system, redundancy built in,
no down time replacement of separate
Hello wrenches,
We have an opportunity to install a very large (60 kw) off grid system
in Mexico. It is currently three phase. I do have the option of
changing out the air conditioners (36 of them) to 120 single phase, but
it is an added layer of complexity/cost that it would be nice to avoid.
We have more than 70 pole mounted systems, including one of my own that is
16 years old, and I have not seen any problems. Our oldest pole mount
installation is 20 years old and at least visibly, is not showing any
signs of wear and tear.I inspected it last time I was there, less than a
year ago.
Hi Gary,
We've done several SIP projects and I've done the same research you are
now likely doing.
What I ended up designing was a system of aluminum plates (8x8) that
screwed into the roof sheathing at four points with 1/4 ss lag screws,
then using 1/2 threaded rod that ran through the center
Hi Ben,
We've done a lot of this type of system using Surrette KS series batts.
I haven't ever asked the question you did, but experience told me that
differing battery lengths are more important than some give credit for.
I actually use slightly longer (16 cables) and , in cases where we
run
Hi John,
We have many, many REC panels installed, from Maine to Antigua. They
are a heavy panel, but also with a heavy frame, good for snow loading
and high winds. They are similar in efficiency to Evergreen. The 240's
these days weigh in at about 48 pounds each. Beside REC's recall of
2008
This sounds more like many of the owner-installed systems we see. If the
customer paid a professional for a job like that it is partially that
clients fault. Those potential clients who don't do their homework often
get what they pay for..
Daryl DeJoy
NABCEP Certified PV installer
Penobscot
We have about a dozen battery based systems that the clients have taken
advantage of the 30% Fed. Tax Credit. They haven't had any response that
would indicate a problem.
Daryl DeJoy
NABCEP Certified PV installer
Penobscot Solar Design
A commercial customer of ours, who is an attorney,
Does anyone have experience mounting arrays on barns with 24 wide
galvanized roofing (not standing seam)? It is flat, not corrugated, but
has an overlapping edge on either side. It's pretty much a standard on
barn roofs around here, but I hesitate to penetrate any metal roof. How
have others dealt
Hi Bob,
I believe it's about 30 watts. Can't you just leave it in search
mode? That will use considerably less power...
Daryl
Can anyone tell me the standby power draw on a
Xantrex SW 4048 plus?
I am betting it's 25 to 50 watts just sitting there doing nothing, all
this inverter does
Hi August,
For small systems such as you are planning here we have had great luck
with the Morningstar MPPT controller, Suresine inverter and Morningstar
control module. We build them into a little powerpanel on a backing
board and take them out to the job pre-wired. We have five or six of
these
We only recommend propane for our customers in cold weather. Propane burns
cleaner and certainly starts very reliably on even the coldest nights when
installed properly. We have inherited customers with diesel gennies that
over time eventually switched over to our recommendation of propane and
are
We do about 50/50 grid tie and off grid and from our experience I second
Dana'a comment below about water cooled and particularly about low rpm.
Daryl DeJoy
NABCEP Certified PV installer
Penobscot Solar Design
I use Onan more than Kohler but water cooled and low RPM are
the ticket.
Dana
I tested an early beta model which had a lot of issues, but Apollo is a
solid company and I suspect they have made the requisite improvements. We
have the first two T-80's off the line on a small island in the Bahamas
and they have performed flawlessly now for (four?) years. We have a total
of 12
Thanks for all the great feedback guys. This thread was not intended to
knock OutBack. I live with and our office is powered by OutBack and I like
their products very much. I just don't trust their AGS from experience
(and obviously others have had similar experiences) and will continue my
search
Can anyone point me in the direction of a good, autonomous generator auto
start. We have an off grid system with a substantial array (8 kw) and
using a dual OutBack 3648 PP, but we have not had good luck with generator
auto start using the relays and Mate within the OutBack equipment. I would
like
Todd,
We've paralleled TriMetric meters many times. I have not tried the
Pentametric, but the orginal TriMet works well.
Daryl
!DOCTYPE HTML PUBLIC -//W3C//DTD HTML 4.01 Transitional//EN
html
head
meta content=text/html; charset=ISO-8859-1
http-equiv=Content-Type
Hi Jay,
We really like Phocos controllers for smaller applications. Check out
The DIngo.
http://www.phocos.com/datasheet_cc_dingo.html
Daryl DeJoy
NABCEP Certified PV installer
Penobscot Solar Design
HI All,
Any recommendations on a small 7-10 amp 48v controller, preferably
Take a look at Citel lightning protection. They install on a din rail. We
are installing a 15 kw array for Acadia National Park and they were spec'd
for the project. It will be our first time using them but they look
promising.
http://www.citelprotection.com/ac_surge.htm
Daryl
I've also
Joel,
We are currently in the middle of installing a 7 kw off grid system
with just these requirements. The client is a retired Chicago
firefighter and insisted on this commercial fire suppression system.
After much research the logical conclusion we reached was the same as
William's
Hi all,
I've just returned from relief work in Haiti in the town of Leogane.
It was hit particularly hard by the earthquake and will not have any
real semblance of electricity other than generators for the next
couple of years. Water and septic will likely be longer before repairs
can be made.
Ben,
Here in Maine we don't install diesel gennies in off grid applications.
Typically, diesel gennies require a block heater which can use as much
as 1000 watts. Unless this is a tremendously large off grid system it
won't be a good idea to go that way.
Why not just use a propane gennie.
That's a great tip Steve. Is there a downside to changing this setting?
Daryl
Ray,
If you go to the Status FX Sell menu what is the disconnect reason when
it does this?
Also have you set the Grid Tie Authority from IEEE to User, when
customers are all the way out at the end of the line
Hi Jeff,
We were contacted the other day by Lowes, who asked if we would be
interested in installing their (highly overpriced) plug and play
systems. They are selling Andalay Solar's 3kw package (they us
Enphase). I told them we would at an installed price much higher than
we usually charge.
Thanks Joel. I would also add that the utility also ran a much larger
feeder line from the transformer to my house, likely to cover all their
bases.
Daryl
Ray,
I think Daryl is on to something. I would suspect a line problem
(under-sized feeder, bad connections, failing transformer, trees
Ray, Believe me when I say I have gone through all the exercises described
so far by our esteemed colleagues. I think you will find the problem is
with the customers transformer. I continue to make impressive amounts of
kwh since the swap out last week.
Daryl
Battery bank is in great shape,
Hi Ray,
It's very funny this comes up with you now. I have a 3500 watt array
running my home. For years I sold between 10 and 16 kwh per day,
depending on the time of year, on a sunny day. I should mention the
panels are in a south facing field on pole mounts.
Suddenly I was noticing a
Hi Jeff,
Try Todd at Solar Electric Distributors. 877 778 0009 or 303 778 0300
Daryl
We normally keep a good supply of pre-made module MC4 M/F cables in stock,
but several recent large projects really lowered our inventory. No
problem, I will just call our suppliers and order more.
We installed the first two released Apollo T-80's on a job in the
Caribbean three years ago. I was out on that island two weeks ago and went
out to check on the system and it is still performing remarkably well. The
home is actually on a bluff overlooking the ocean with the BOS components
Hey Tump,
Evergreen still makes these. I suspect Gro or one of the other
Evergreen dealers stocks them.
Daryl
Anyone have one of these around? Please contact me off list. THANKS
mailto:t...@swnl.net t...@swnl.net http://www.swnl.net/
www.SWNL.net
Solarwinds
I try to do more lurking here than participating, simply because there are
many experienced installers here with similar experience and knowledge. I
do agree with the earlier post that maintains the best experience with off
grid systems is living with off grid solar. Our office is 100% off grid as
Here, here Bob-O.
We, too, have seen no decrease in our off grid market as well. It is
rapidly becoming a specialized field here in Maine.(not talking about
you, Tump) Even our largest competitor is now sending off grid business
to us as they have had too many problems training competent
Ryan,
If you haven't tried the Apollo Solar controller you might consider it.
We have many installed and they seem, after an intially rough start, to
be a superior product. I have yet to use the high voltage model but
plan to at the first opportunity. You can configure the panels to 200
VDC OC.
All REC modules manufactured in 2008 are being recalled. The have a
problem with thermal cycling over a period of time weakening a
contact in the j box. We have installed REC and think they are a
good panel. REC is paying us to go to Cat Island in the Bahamas to
replace 16 modules we have
We have installed about 20k of these modules, largely off grid. I
would make these recommendations:
Install on good quality mounting. We have almost exclusively been
installing these on DPW top of pole mounts. The frames are not
particularly beefy but they are not flimsy, either, and a good
Carl,
In the past we have had 8x8x 1/4 aluminum plates made up by the
local machine shop for about $9 each and used them to distribute the
compression for L feet on SIP roofs. It works very well and allows you
to adequately tighten the lags and not compress the foam. For more
specifics give me
Hi August,
Here in Maine we get pretty decent amounts of snow. There isn't any
foolproof way to keep your panels clear without doing it manually
because we sometimes get sticky, half ice, half snow type of
precipitation, but here's some of the things we do.
1. Do you typically mount arrays
I've dropped my six year old Fluke 337 three times, once off a second
story ladder onto a gravel driveway, and I'm still using it without ever
sending it off for repair.
Daryl DeJoy
NABCEP Certified PV installer
Penobscot Solar Design
Don't know about the rest of you, but I can and
We are in Northern Coastal Maine and have red squirrels, gray squirrels
and flying squirrels and in 21 years have never had a squirrel problem.
Daryl
Penobscot Solar Design
I am in the real Northern New York, (not the city) and have no problem
with
chipmunks or squirrels or anything else
These all seem to be just more people trying to make money from the solar
bandwagon. I ignore all of these. It takes less time to hit delete than
to try to follow up with them.
Don't waste your time IMO.
We tried one a while back, and 95% of them were something like we are
interested in
Hi Ryan,
There are a number of thin film products that can be laminated onto a
truck roof, but when it comes to running an air conditioner it will
only be something he imagines runs his ac unit. UniSolar makes a long,
thin roof laminate but it must be adhered to Galvalume or Zincalume
roofing
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