New 3.6m ferrite windmill on Scoraig

Posted in ferrite magnets, my own projects, Scoraig | 1 Comment

A couple more PowerSpout turbine installations where customers have sent photos

These are both budget systems.  Installed since my last post in February.

The first is a low head site in the UK.  160mm PVC drainage pipe works well if properly supported.  This one is grid connected using a Ginlong Solis inverter.  The “twin pack” is a very cost-effective way to buy a pair or TRG turbines like this with free shipping.

Next is a PLT turbine using 63mm PE pipe for a long 300m run to achieve a 30m head.  This one charges a 12V battery using a low cost Tracer MPPT controller, and a Tristar for load management to keep the turbine under load all the time.

It’s great to see photos of turbines up and running, but most times I just have to be happy to hear that everything is going fine.


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User experience with evacuated tube water heating

Nathan Jowett asked me to publish his article that he wrote about his solar hot water system.  I have to agree with him that evacuated tubes are brilliant, having had my own system for fifteen years now.

Nathan’s Article V3.0

Posted in People, Uncategorized | 1 Comment

Kragten update again

Dear Hugh

I have written a new report KD 723 which can be copied for free from my website: at the menu KD reports. The title of this report is: “Ideas about an 18-pole, 2-phase permanent magnet generator using the housing of a 6-pole asynchronous motor frame size 100 for driving a 0.55 kW motor of  a centrifugal pump”. In chapter 6, an alternative 6-pole armature is described which can be used in combination with the standard 6-pole, 3-phase winding.
Adriaan Kragten
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New Kragten paper on asynchronous motor conversion

Report KD 718 can be copied for free from my website: at the men KD-reports. The title of this report is: “Ideas about a 16-pole, 3-phase permanent magnet generator using the housing and winding of a 4-pole asynchronous motor frame size 100”.

This report describes a way how to modify a standard 4-pole, 3-phase asynchronous motor such that it can be used as a PM-generator for a wind turbine for 24 V or 48 V battery charging. Manufacture of the new armature is rather easy as the magnet grooves are wide and shallow and in parallel to the armature axis. The magnet costs are low as only a rather small magnet volume is used. Mechanically the armature has sixteen poles but physically it has four poles and therefore it can work together with the standard winding of a 4-pole motor. The flow pattern is given in figure 2. The armature pole angle is 2.5° larger than twice the stator pole angle and the fluctuation of the sticking torque is therefore almost flattened. A front and a side view of the armature and the stator is given in figure 1.
Adriaan Kragten”
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Upcoming workshops with Jonathan in Germany and Austria

Windrad Selbstbau Workshops  

Baue mit uns ein Windrad. Voll funktionsfähig, nach dem weltweit bewährten Piggott Design.

Die einfache Anwendung nachhaltiger Technologie steht im Mittelpunkt des Workshops.

 An einem Workshop teilnehmen

 Einen Workshop veranstalten


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Some of the owner-installed Powerspout turbines that I supplied over the last twelve months

Bear in mind that the turbines are freshly installed and working so the setup is a bit rough in some cases. Most owners will do a bit more work around and about or even build a shed although this is not necessary for protection against the rain. These turbines happen to all be in the British Isles.

Most of my sales are to people who do the work themselves, so I spend plenty of time explaining stuff. I love it. Especially when I get to see pictures.

This PLT in England was expected to produce 548W but kicking out 720W off grid.
Posted in PowerSpout hydro turbines | 1 Comment

F-series wind turbine manual available soon from Jonathan

Here is a link to find out more and keep in touch with Jonathan.
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New chapter 9 in Kragten’s public report KD 341

Adriaan writes:

“Dear Hugh
I have added a new chapter 9 in my public report KD 341 which may interest you. The title of this chapter 9 is: “Voltage generation in a coil”. This chapter also contains three pictures of a small 8-pole axial flux PM-generator which show how you go from the ideal coil shape to a shape which is easier to manufacture and contains more copper. KD 341 can be copied for free from my website: at the menu KD-reports.
Adriaan Kragten”

It’s comforting to see that the coil shape arrived (below) at is similar to the ones I use in the F- series alternator designs, where I pack in the maximum number of ferrite magnets into the disk. With my Recipe designs for NdFeB magnets I used larger disks relatively and therefore a different coil shape.

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An up-to-date list of UK sources of materials for my wind turbine projects

My most recent wind turbine plans are dated 2014, and I don’t really make enough sales to justify updating them now but the list of UK suppliers at the back of my Recipe Book is out of date for sure. Often the best supplier will be a local one, but I will offer a list of suppliers below in case this is useful.


Neodymium Blocks 46mm x 30mm x 10mm thick from Spider Magnetics These are grade N35 which is not particularly strong, but it is hard to find this size neo magnet these days. Powermagnetstore have N40 which is better for keeping the rpm down, but the cost is somewhat higher. You can get N42 from First4magnets but the cost is almost double the cost of the N35 ones. Thanks to Adriaan for pointing out Enesmagnets in Poland who can offer 50 x 25 x 12 magnets in N38 which should work well with the Recipes.

Ferrite Magnet 50 x 50 x 20mm thick (C8 Grade 3) as used in my 2F turbines
First4magnets have them.
Ferrite Magnets 75x50x20 Y30 as used in my larger 3F, 4F etc
Magnethandel in Germany have these.
First 4 Magnets have 75x50x20 blocks
Enes also have 75 X 50 X 20 / F30 – Ferrite Magnet

Winding wire

I buy my winding wire in 20kg reels from EC wire.
For smaller deals, here is an ebay supplier I found quite easily.

Resins, Vinyl Ester, Epoxy etc

East Coast Fibreglass
These suppliers also offer the glass cloth you need for reinforcing the resin castings

Steel disks

Find a local workshop that offers profile cutting services. Bear in mind that it will be much cheaper to buy a larger batch if possible (shared with friends?). I like to get them sent to be galvanized on their way to me. Another option is to get them powder coated but I don’t find this lasts so long in my maritime environment. It is possible to cut your own disks using a grinder (a big polygon works OK). Harder to get a precise result this way.

Trailer hubs

There are several online suppliers.
Trailertek offer stub axles and hubs for small turbines around 2m diameter
(beware of the seal behind the bearings which will not last due to thrust of the wind, so safer to remove this seal)
and also some nice solutions for bigger machines at low cost.
I have also used AutoW for hubs and they offer cheap options.
Towsure are a good option too.
You may wish to replace the bearings with decent ones such as SKF or other major brands.

I hope this helps. If anyone needs further advice please contact me at [email protected]

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