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Posted by tg on January 20, 2007, 6:34 pm
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> wrote:
>
>> I can't see a
>>telescopic pole working. It wouldn't be strong enough to hold a bigger turbine
against stormy winds - unless you know of a
>>particular product that could withstand such stresses. It would have to be an
extremely well made piece of kit. The pole I use is
>>a
>>2inch stainless steel pipe of 5mm wall thickness and even that sometimes
wobbles and bends a bit in strong winds.
>
> Some bending is tolerable. For example, I see lots of Air 403s on 20
> ft. poles without guy wires. If some additional height on your pole
> takes the form of a larger diameter pipe telescoped over the existing
> one (assuming the larger diameter is sufficient for the new turbine),
> then the stresses will be concentrated on the overlapped portion.
> Perhaps you could reinforce that area.
yeah I see what you mean and was thinking of this myself. But I'm still worried
about such a move as - in my case - I don't think
the uppermost pole anchor point (bracket on the wall) is strong enough to
withstand the twisting action produced by wind hitting
the turbine. To clear the gutter the brackets hold the pile about 9 inches out
from the wall, which puts a lot of stress on the
anchor bolts going into the brick. I just don't think I can push my luck on this
one. This problem of insufficient anchor strength
only applies to my own installation, not other peoples. I think there's enough
anchor strength to go up to a slightly bigger
turbine, (say double the power) but not enough to go higher.
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Posted by Todd on January 20, 2007, 2:27 pm
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I'm wondering what people are using these wind turbines for. What's
downstream in the way of batteries, inverters, loads?
>From the manufacturer's literature, in the best of cases it's only 200
watts.
=B7 Designed for unattended applications
=B7 Typically used for street lighting, remote telemetry and data
loggers
=B7 Starts charging 0.5A at 6.5 Knots, Tail furls at 40 knots and
gives 20A
/Todd Marshall
Plantersville, TX
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Posted by tg on January 20, 2007, 6:18 pm
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I'm wondering what people are using these wind turbines for. What's
downstream in the way of batteries, inverters, loads?
speaking for myself I consider a wind turbine a backup source of power in the
event of prolonged grid failure.
I'd be the first to agree a turbine could never compete with power from the
national grid, but in the event of zero power coming
outta the plugs the power from a wind turbine is better than nothing. I think of
it as preparing for a rainy day. A turbine will
only trickle charge batteries and such, but it's better than nothing. And if the
grid ever goes down, I don't want to be stuck with
nothing.
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Posted by Steve Spence on January 20, 2007, 9:23 pm
Please log in for more thread options Todd wrote:
> I'm wondering what people are using these wind turbines for. What's
> downstream in the way of batteries, inverters, loads?
>
>>From the manufacturer's literature, in the best of cases it's only 200
> watts.
>
> · Designed for unattended applications
> · Typically used for street lighting, remote telemetry and data
> loggers
> · Starts charging 0.5A at 6.5 Knots, Tail furls at 40 knots and
> gives 20A
>
> /Todd Marshall
> Plantersville, TX
>
Our wind turbine helps charge our 1260 ah 12vdc battery bank. That
battery bank feeds a xantrex prosine 3kw sw inverter, that powers our house.
--
Steve Spence
Dir., Green Trust
http://www.green-trust.org
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Posted by Todd on January 20, 2007, 10:33 pm
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Steve Spence wrote:
> Our wind turbine helps charge our 1260 ah 12vdc battery bank. That
> battery bank feeds a xantrex prosine 3kw sw inverter, that powers our house.
I have one 160W PV panel (that only puts out 90W for 5 hours on a sunny
day ... otherwise, nothing.) It cost about $700. One of these wind
turbines seems to be about twice that capacity and costs about twice my
PV panel. Assuming the wind blows continuously (like on the Oregon
coast), wind turbines could be potentially 5 times more effective per $
cost than PV's.
My one PV panel is essentially useless. It won't keep my 10 70AH
(i.e. 700 AH battery bank) batteries charged with just my 40W
continuous average load refrigerator draining them.
If I had more PV panels it could potentially charge the battery bank.
To support more drain, though, I'd need more batteries. I presume the
same kind of experience is found with the wind turbines. You need more
than 5 hours of wind per day, and you need it every day. You need lots
of batteries. You need several turbines to charge a battery bank
intended to span the periods when you're not charging and to support
life (comfort) supporting loads.
My $200 2KW diesel burning about 6L of WVO per day has 5 times the
capacity of a single wind turbine, has 10 times the capacity of my PV
panel, and can operate as needed, continuous or otherwise, to maintain
battery charge sufficient for life (comfort) supporting loads which
the $2K to $5K alternatives cannot practically support.
And you can stockpile large quantities of WVO easily.
Batteries, PV panels, wind turbines, and such thus don't seem to
scale up very well when compared to an IC engine, particularly a
diesel, and more particularly a diesel burning WVO.
Why are those alternatives even being considered if you're just looking
for backup when the grid goes down?
Todd Marshall
Plantersville, TX
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