Hello Russell,

A little info on this particular wind turbine here, no deep hole - unless y=
ou buy one=20
;-)

https://www.1-day.co.nz/products/ecopower-outdoor-wind-turbine-3

Speed regulation: Automatically adjust windward direction
Control system: Electromagnet

Not externally obvious how it acheives adjusting of the windward direction,=
 but=20
probably one of the ways you mention. I notice pushing directly backwards o=
n the=20
shaft it seems to push against a spring, or could be magnetic force.

I'm on a hill, 2 story house, predominant wind westerly but have put pole u=
p on the=20
north side to keep out of sight from the neighbours and to shield them from=
 any=20
potential noise issues. Not sure if sound will be much of a problem, but co=
uld=20
relocate later if noise ok and more wind desired. It will be several metres=
 away from=20
the side of the house, using balcony to help secure the pole, pole goes all=
 the way=20
to the ground (un-official lightning rod). Turbine height almost the same a=
s roof=20
peak.

Many thanks for the offer of bits and pieces, will see how we go~!

Brent

On 3 Dec 2018 at 0:10, RussellMc wrote:

> Brent
>=20
> I can add to this if needed but
>=20
> - If you value WT survival and if it is in a site where it can be
> potentially "overpowered" then be sure it has shutdown / loading /
> braking
> / feathering / stalling / off-winding mechanisms to protect it. SAs
> you no
> doubt know, energy into the WT disk increases with velocity cubed.
> So a WT
> rate to deliver 300W at say 10 m/s is  notionally being delivered
> a
> deliverable 2^3 x as much =3D 2400 W at 20 m/s. This will be modified
> by
> stalling and other mechanisms but disk pressure rises with velocity
> squared
> so you are liable to get significant loading increases even if power
> into
> the alternator does not rise at Vcubed rate.
> - In some designs hard shorting of the outputs can provide enough
> braking
> to slow or stop an overspeeded WT but in some/many cases high enough
> wind
> speeds will not be able to be overcome by electrical braking.
> - A common method of power reduction is to have the WT head tilt off
> wind
> or sometimes tilt-up under wind pressure. Some Chinese designs
> have
> mounting holes designed to allow the head to pivot accordingly. Some
> have
> these in the wrong place :-). The intention is that the weight forms
> a
> torque to hold the head into the wind and pressure on the disk
> overcomes
> this causing slewing. An alternative is to spring or gravitationally
> ramp
> the "tail" so the WT is not held into the wind and as before turns
> cross
> wind.
> - In large commercial units blade pitch control is the norm but this
> is
> liable to be unavailable on your unit.
>=20
> Several loanable items listed below. I want to use them (again)
> longer term
> but they are available for loan for some to quite a few months:
>=20
> - I have a currently unused small (250W?) grid tie 24VDC-230VAC
> inverter
> intended for (according to label) wind turbine use. It works but
> quality
> and true capability is unknown and lack of legal certification for
> connection to the grid is guaranteed :-). You are welcome to borrow
> it for
> a while to play if of use. More details on request. (I have used
> it
> successfully for trialling PV input. Long term it may end up
> islanding on a
> caravan).
>=20
> - Controllers often offer "load dump" outputs where excess energy
> is
> shunted to. How and how well is TBD in each case.  A good load for
> WTs are
> available low voltage water heater "spears" - these may have two or
> 3
> separate elements which can be either switched sequentially or PWMd.
> Don't
> let them run dry for too too long :-). I have a friend who may have
> some
> for sale and have one unit which may or may not still be usable if
> you wish
> to play.
>=20
> - Surplustronics in Ak used to be an OK source of large wattage
> resistors
> suitable as loads. I may have some (used by me as exercise bike
> loads that
> MAY suit your use. Resistances and wattages and findability tbd and
> may not
> suit.
>=20
> - You can also buy large diameter high current rating nichrome wire
> suited
> for low voltage elements. I have a coil rated at 500W + air cooled -
> free
> form self supported spiral wound (also used as exercise bike load -
> 500
> Watt or more at ??? V* and easily tapped.  (* Vin the 10's of V
> range
> normally but would rise with user testosterone level and
> enthusiasm).
>=20
> - More ...
>=20
>            Russell
> --=20
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist


--=20
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View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.