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Updated: 1 hour 55 min ago

Re: 5kw Poncelet Wheel Project

2 hours 34 min ago
welcome to the forum  skid. photos, photos.

Re: Perfect Windmill Design?

7 hours 19 min ago
outrunner motors and generators serve a niche because the shape of the magnetic poles forms a halback array in a sense because the magnetic vectors are concentrated inward at the cost of their volume, to form a higher concentration of magnetic flux at ...

5kw Poncelet Wheel Project

7 hours 50 min ago
I thought this site would be a good place to document my build and installation of a Poncelet wheel. I will assemble the wheel and then install it. This will be done in my spare time and will take some time due to the magnitude of the project.


Re: The Little Box Challenge could shake things up!!

8 hours 22 min ago
Yes, very interesting.

Quite a decent set of engineering rules to get accepted.



Re: The Little Box Challenge could shake things up!!

8 hours 49 min ago
Possible if your microwave is the size of a sugar cube, washer and drier not larger than a matchbox...

Re: Perfect Windmill Design?

Tue, 07/22/2014 - 20:25
"permenent magnet alternators" is a pretty broad range of devices.
I have my own preferred type, based on the Zubbly conversions on induction motors.
The Otherpower pancake alternator is a scaled-up version of Hugh Piggott's alternators.
If you were to...

Re: Perfect Windmill Design?

Tue, 07/22/2014 - 19:30
I like the permenent magnet alternators for the bearing life.  Is there anything that has the durability, but has low RPM POWER.

Re: Analog ammeter (how to use it).

Tue, 07/22/2014 - 17:49
You are on point Brian. I have observed over time how one of the meters rated 0-150 amps reacts at different levels of insolation. The maximum i have seen it go is slightly over 75 amps which i know is far from reality. However, the meter gives me a ro...

The Little Box Challenge could shake things up!!

Tue, 07/22/2014 - 16:23
Google are offering $1,000,000 prize for an inverter that can hit at least 50w per cubic inch.


Should be interesting...

Re: I know...the community is about HAWT here but...

Tue, 07/22/2014 - 16:17
it shouldn't require a tail.
if the point of rotation is in the nose of the air foil  the mill  should pull itself down wind.

Re: Analog ammeter (how to use it).

Tue, 07/22/2014 - 11:27

Tecker Current transformers only work on AC. Clip on meters to read DC normally have a hall effect device to measure the magnetic field round the cable. Moving iron meters are not known for their accuracy or ability to read low values, but if all yo...

Re: I know...the community is about HAWT here but...

Tue, 07/22/2014 - 10:29
Absolutelyl Gizmo, the performance of a HAWT has always been superior to a VAWT, however I am not in a location that would tolerate one.  I can get a VAWT up without much difficulty...

Just started putting my grid-tie generation on-line live

Tue, 07/22/2014 - 09:52

Given the low power and 4 USB ports of my shiny new Raspberry Pi B+ I've been able to plug in my SunnyBeam to extract the data live.


I may build a gizmo to power down the SunnyBeam to save the 200mW ...

Re: Analog ammeter (how to use it).

Tue, 07/22/2014 - 09:19
High quality moving iron meters are fairly good for ac, on dc they tend to suffer from residual magnetism, if you take a reading, reverse the leads and read again you may find a difference, if so the average will be close to correct.

Moving iron meters...

Re: Analog ammeter (how to use it).

Tue, 07/22/2014 - 03:05
Ok thanks fo your replies. I have decided to use two other moving iron ammeters i found but they give different readings when i use them to measure amps from my solar panel. Moving iron ammeters IMO are not reliable.

Re: Brush Generator

Tue, 07/22/2014 - 00:44
Thanks for clarifying. The reason I asked is that theres some kind of inertia driven device that  can be heard when spinning the rotor by hand. I have no idea what it is and dont want to take the generator apart to find out. I will post some pictures l...

Re: Brush Generator

Tue, 07/22/2014 - 00:37
The Isenthal regulator is a separate device which can be used to regulate the voltage of a dc generator or an alternator via an exciter. It needs to be rotated either from a drive from the generator or a small electric motor. It has a pair of cam drive...


Tue, 07/22/2014 - 00:06
I've always imagined those 500-1000W bike hub motors from Golden Motor, idéal candidates as generators in a water wheel setup.
Just remove the spokes/rim; mount it on a solid fork, and use a serpent drive belt to connect it to a water wheel.

I do...

Re: 10 kW Ventera Rebuild

Tue, 07/22/2014 - 00:01
Thanks again for so much detail in your responses.
Just one more, please: Do you use the lattice tower or the hinged mono-pole?