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Updated: 54 min 59 sec ago

Re: Restoration of a 150 year old Barn.

1 hour 32 min ago
Love your bricks, laid to line, excellent.

12/12 pitch?

Here's the barn roof I will be re-slating......... my pitch is shown as 48 degrees, so that's about a 75mm lap.



Finished the Salon, re-wired the Old chandelier and electric-ed it, re-st...

Power Jack Inverters

6 hours 6 min ago

 Since watching all the info Oztules has provided on the 6KW inverter build thread, I have been looking at Power Jack battery inverters. Prices seem reasonable for a battery inverter.

 Are these inverters decent quality. I know nothing about electron...

Re: Building a 6kw pure sine wave inverter using power jack boards part1 transformer

11 hours 56 min ago
Thank you yet again 'oztules' for your fine description of whats going on in your circuit, excellent stuff.

I am waiting for the 'Facture', (postman) for a few components.
My Oz Inverter is being fitted into its enclosure.

Okay 'oztules' the million do...

Re: excel tool for calculating axial flux generators

12 hours 6 min ago
Hello SparWeb,

Thanks for the reply!

The Excel sheet is indeed intresting. However, the outcome does not match the outcome of the axial flux calculator excel sheet?

I don't really need a reference for the formulas. I only would like to know if there is...

Re: Stator stopped conducting after being cast in resin.

Tue, 09/01/2015 - 12:08
he means soldering flux should be applied to the thoroughly cleaned components to be soldered to ensure good conductivity rather than rely on flux core solder

Re: excel tool for calculating axial flux generators

Mon, 08/31/2015 - 20:22
Hello Stirling,
Welcome to the forum.

I looked at the site you linked (thank you for that!) and it seems to be a detailed calculation of the average flux density at any point near the face of the magnet, given the geometry of the magnet and the remanan...

Re: excel tool for calculating axial flux generators

Mon, 08/31/2015 - 13:40
Hello,

I am tranlating the excel sheet to a C# application with addtional documentation about the used formula's.

I would like to know what the formula is behind the calculation of the magnetic flux density? is there a referece?

=magnet grade-((magnet ...

Re: Active Pitchcontrol

Mon, 08/31/2015 - 11:52
 Hi Arch.

Between 180 - 350 Rpm it's running safe. No high centrifugal forces. 600 Rpm is dangerous.
The amount of sunwheel teeth here  is 37 to keep the hub compact. Disc diam. is 280 mm.
More or less teeth gives the same result to move the blades syn...

Re: Hybrid Supermileage Car

Mon, 08/31/2015 - 09:56
That engine is the pushrod - rocker engine that was used in 2012 and 2013.  It was selected since it had lots of horsepower.

The rotary valve concept is still being pursed at an increased pace.  I'm now on the 5th version (1,2,3.0,3.1, & 3.2) of the de...

Re: Restoration of a 150 year old Barn.

Mon, 08/31/2015 - 07:37
Clockman;
As promised, here is a pic of our home's brick

This is the North side of the house. Pay no attention to the mail slot being redone. I'm trying to make sure the patina isn't removed while re-insulating the contact with the wall. BUT...

Re: Active Pitchcontrol

Mon, 08/31/2015 - 06:27
Smitson,

The electronics for the steering of Midwouds turbine is also on this topic.
And real good functioning for years now.

Greetings Rinus

Re: PowerJack 2400w smart solar controller DC12V/24V, MPPT,100AMP

Mon, 08/31/2015 - 05:56
Let us know how it goes when you do get it up.

I might modify one of my solar pump boards and see if it is any better than straight pwm... I will use a set point of  61v and see if there is an improvement over the pwm one I am running at the moment.

Ac...

Re: PowerJack 2400w smart solar controller DC12V/24V, MPPT,100AMP

Mon, 08/31/2015 - 01:06
The panels I have are 43Voc and 34.6 Vmpp.  The maximum I think that can be pumped into the unit is 45V.

There will be some voltage drop because I have gone for 8 B&S Tycab cable rather than 6 B&S from the panels to the controller, but with a short run...

Re: Stator stopped conducting after being cast in resin.

Sun, 08/30/2015 - 22:15
Quote from: Flux on August 24, 2015, 10:30:00 AMWhat you are doing sounds ok but before assembly and crimping I would flux the components. I am not sure of the materials available across the pond but relying on cored solder ...

Re: Self-Supporting Tower Foundation Dig - still digging

Sun, 08/30/2015 - 20:29
Here is a picture of a small caisson drill rig like they used on my mother's condo. They are very small and portable. The drill bits can be linked together for making deeper holes.

Re: Self-Supporting Tower Foundation Dig - still digging

Sun, 08/30/2015 - 20:10
Your home sits on a floating slab, that's how most homes are done if the land is level. That works fine because the weight is spread long and low.

Stick a tower way up and put a mill on it and then it's not okay. If it settles a little off level it wil...

Re: Active Pitchcontrol

Sun, 08/30/2015 - 19:55
Hi:  I have a few questions.  I must say this is a very clever idea.  Thank you for sharing.

1.  Why do you limit the rpm from 180 to 350?  I was thinking Scoraig Wind (Hugh) in one of his textbooks said that the maximum rpm for an axial is 3 times the...

Re: 750 Axial Flux

Sun, 08/30/2015 - 19:19
500 rpm cut in is pretty steep!

Re: Self-Supporting Tower Foundation Dig - still digging

Sun, 08/30/2015 - 19:17
I don't think you have a problem, just the rain saturated the bottom of your hole. Long as the sides are firm it should support the tower just fine.

Giving away tachometers

Sun, 08/30/2015 - 18:11
Hello,

As I am now in my mid 60’s I am dismantling and giving away whatever I can from my RE systems.

The latest give away to a good home are two sets of tachometer in working order.

I have not used them for many years and I believe the following web a...