I've got to install a pole mount for a solar array. The manufacturer
says to use 5" schedule 40 steel pipe (5 9/16" OD). The hole is
.81 cubic feet of concrete
Do I need to weld any kind of rebar to the bottom of the pipe?? What
kinds of coating would be best before pouring concrete? Of course, I'll
be sloping the top of the concrete for water drainage.
I'm assuming that I need the concrete poured under the pipe opening ....
so what do I use as a standoff to raise the pipe off the bottom of the
hole? Should I cap the end of the pipe encased in concrete?
I was planning on building a 2x4 wood collar above ground, along with
diagonal 2x4's for ground support to maintain vertical until the concrete
Any thoughts or recommendations? Thanks!
How big is the arrray? Wind load? weight? When I installed basket ball
goal post was similar situation. No rebar, I filled the pipe with
concrete about half height, My kids are all grown up now, the pole still
stands rock solid. Wife let me install a cross bar so she can hang
flower baskets during summer time, LOL!
On Mon, 28 Apr 2014 09:00:25 -0600, Tony Hwang wrote:
There will be two pole mount arrays. Each pole will carry (4) 265W
panels. I don't know the weight or wind loading calcs as all the
engineering was done by the company for a Florida install. The panels
are not heavy at all.
I hope my mount is as strong as yours sounds!
Even if the actual weight is not much, if the total area of panel is
big, the wind load will matter. I used more or less 1 cu. ft. of
concrete I mixed and poured for the pole. I have 1.5 Kw array on the
roof which was installed with govt. subsidy. Without it, I wouldn't
have it installed. I will have never recovered to total cost until I
die, LOL! It does not have battery back up, just inverter feeding the
grid back and forth. I can monitor what is going on on my computer
because the controller is tied to my router. Is it self tracking panels?
On Mon, 28 Apr 2014 15:31:33 +0000 (UTC), Daniel Carata
If you have over 3000# of concrete in that hole, you will be plenty
strong but I would go ahead and weld a couple pieces of rebar to the
pipe to give it a better bite. They don't really have to be very big.
You could just drill some holes and poke pieces of just about any
metal rod in there. Once the concrete sets around them they are not
Using rough numbers like 1kW for 5 hours a day = 5kHh at $.20 per kWh will save you about $1 per day in your electric bill.
How do you justify this expense?
Don't get me wrong, I am all in favor of alternative energy and I would love to install PV but I can't justify the cost vs payback.
It will take a while to go through this page. It is by a person I know that
is into the solar power.
I have sat in a presentation or two of his at a local ham radio club. The
justification of his is about a 8 year payback. At the time he installed
his system there was a big tax break, not sure if it is still in effect or
not. Then his system starts putting power back into the grid at the same
charge as the power company charges. This goes on from the time the sun
comes up and goes down.
In other words he uses the power company like a big storage battery. While
no one is at home during the day the system runs his power meter backwards
most of the day. Then at night he uses the power. That makes most of his
On Mon, 28 Apr 2014 09:18:03 -0700, makolber wrote:
I could be totally wrong, but I can't calculate a payback curve for
How do you calculate for totally corrupt politicians? How do you
calculate for coal-fired plants going offline? How do you calculate for
nuke power that is looking like a serious threat to humanity?
The media is reporting that electricity is going up. At what point will
they start disrupting our lives?
Obama: My Plan Makes Electricity Rates Skyrocket
Sheesh, discussing politics is a really big no-no. Sorry folks.
On Monday, April 28, 2014 12:49:33 PM UTC-4, Daniel Carata wrote:
You certainly can calculate it, just like you can calculate the
payback for trading out an old 75% efficient furnace for a 93% one.
You can't predict for sure what all the relevant prices will be in
the future, but you can make estimates. Businesses do it every day
before making capital investments. With regard to solar, I've yet to
see a typical solar installation like you see on houses or businesses
that are economically viable without big govt subsidies.
You just make the best estimates of future energy prices. Some of
which look pretty certain. There is a huge supply of natural gas
and it's increasing, so the price of that is likely to remain moderate
for a very long time. And there isn't much indication that Obama and
the libs, who's power is waning, are going to be able to drastically
screw with future energy.
Much of the media knows less than nothing.
As stated, do you really think Obama is going to get anything
passed that makes energy skyrocket? His latest polls are at an all
time low, Putin is making a pussy of him, and after Nov, it sure looks
like he'll be a lame duck.
Add this to your formula if you live in Oklahoma,
A solar surcharge bill was just signed by the governor of Oklahoma,
which would charge a fee for people who install solar panels on their
roofs, and are still attached to the grid. Apparently, utilities in that
state feel threatened by the free energy from the sun, and maybe they
are afraid that the entire state will turn to solar.
On Tuesday, April 29, 2014 10:25:41 AM UTC-4, Fat-Dumb and Happy wrote:
That's interesting, first I've heard of it. But to be fair, they
probably have it right. My electric bill is about half for the energy
itself, the other half is for distribution. If you put up a solar array,
providing most or all of your power, then you're not paying a similar
amount to your neighbor, who has no solar array, ie you're not helping
to pay for the massive distribution system. And at night, without that
distribution system, you'd have no power.
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