Posted by tg on January 20, 2007, 4:59 am
>>Personally, I don't think using a bigger turbine will give you much
>>benefit - you will still have the same wind resource and it seems that
>>there's not enough to give you the maximum benefit of the turbine you
>>already have.
> I disagree. If he doubles the swept area, he can reasonably expect
> about double the output, no matter the location. If it were me, I
> think I'd also add a telescoping section to the pole, and raise the
> turbine incrementally to either the structural limit, or until
> somebody complains. ;-)
that's what I thought - a bigger turbine will bring in more power, irrespective
of the poorness of the location. But 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.
Posted by wmbjk on January 20, 2007, 6:20 pm
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.
Wayne
Posted by tg on January 20, 2007, 6:34 pm
> 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.
Posted by Todd on January 20, 2007, 2:27 pm
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
Posted by tg on January 20, 2007, 6:18 pm
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.
>>benefit - you will still have the same wind resource and it seems that
>>there's not enough to give you the maximum benefit of the turbine you
>>already have.
> I disagree. If he doubles the swept area, he can reasonably expect
> about double the output, no matter the location. If it were me, I
> think I'd also add a telescoping section to the pole, and raise the
> turbine incrementally to either the structural limit, or until
> somebody complains. ;-)