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Re: question re: Building Energy Measurement Devices

Discussion Board - 5 hours 9 min ago
Quote from: george65 on September 26, 2016, 09:04:24 PM[....]

In your case, could you not make up a simple and cheap support separate to the house?  If you are only going to put up 3-6 panels, you wouldn't need an overly compli...

Re: Day one. New project: Helical VAWT

Discussion Board - Mon, 09/26/2016 - 21:13
Quote from: Ungrounded Lightning Rod on September 26, 2016, 06:18:12 PMThen you have to get up to many times the RPM where the whole shaft would resonate before you get a frequency where both the top and bottom unsupported segm...

Re: question re: Building Energy Measurement Devices

Discussion Board - Mon, 09/26/2016 - 21:04
Quote from: jlsoaz on June 19, 2016, 12:57:21 PM
One very separate thing that's a bit frustrating - I had this idea for a small solar panel overhang to replace a tattered old cloth overhang that is at my front door entrance...

Re: Treadmill motor with 6.5 hp gas engine

Discussion Board - Mon, 09/26/2016 - 20:35
Quoteand only run the engine with a battery connected to the alternator (or install an overvoltage protector - a varistor that hangs across the alternator output to keep it from committing suicide if there's no battery attached) and you should be fin...

Re: Day one. New project: Helical VAWT

Discussion Board - Mon, 09/26/2016 - 18:18
Quote from: electrondady1 on September 24, 2015, 06:36:15 AM30mm is a whole lot like 1&3/16" dia.
if you have two bearings one at the top one at the bottom should be no problem.
if two at the bottom and none at the top it's di...

Re: Treadmill motor with 6.5 hp gas engine

Discussion Board - Mon, 09/26/2016 - 17:56
Quote from: hiker on September 10, 2016, 11:10:10 AMDon't really need that much hp. Even a 3 hp lawnmower engine works great.

1 HP = 745.69987 Watts (almost exactly 3/4 of a KILOwatt).  So even with a moderately ineffi...

Re: 5 blade vs 11 blade design

Discussion Board - Mon, 09/26/2016 - 16:03
Quote from: richhagen on September 07, 2016, 06:53:23 PMIt is the minimal odd number of blades that can be balanced without a counter weight.  Even numbers of blades tend to have vibration issues which is why we don't see many t...

Re: tail hinge re-work

Discussion Board - Mon, 09/26/2016 - 14:36
Been away for a week of training - old dog; new tricks.

Here's the lower seat for the hinge pin fashioned out of 3/8" steel.  I think it came out pretty well.


I've cut the hinge pin to length, and mounted a bushing on the top.  This will be ...

Re: Control for heating with solar off grid no batteries

Discussion Board - Mon, 09/26/2016 - 06:56
I spent quite a bit of time going over the postings trying to make sure nothing was missed.
Done some updates to the sketch reply # 16  panel = panel - panel / 2;  panel = panel +
rawdata;  deleted  * 32 multiplier,   now when serial monitor is brough...

Re: Using a ASC712 current sensor with UNO

Discussion Board - Sun, 09/25/2016 - 23:45
"I buy the +-5A versions and use them with a shunt if more current is needed."

This is interesting. How this home made shunt is made?
Can You give some pictures.

I was using 20A and 30A versions.

Re: 6 METERS VEDİKAL WİND TURBİNE BLADES

Discussion Board - Sun, 09/25/2016 - 21:41
What kind of wind speed in your vids.? Looks cool...but does it produce what you want out of it?

Re: Halbach array ????

Discussion Board - Sun, 09/25/2016 - 15:11
thanks , that is somehting to chew on....

Re: 6 METERS VEDİKAL WİND TURBİNE BLADES

Discussion Board - Sun, 09/25/2016 - 11:28
rope to stop the turbine

Re: 6 METERS VEDİKAL WİND TURBİNE BLADES

Discussion Board - Sat, 09/24/2016 - 18:43
What is hanging off it?

Re: The OzInverter 6kW -15kW New Power Board.

Discussion Board - Sat, 09/24/2016 - 15:04
I bought a couple ebay boards and I will be doing push pull using a small UPS transformer.  Of course I am only planning it to be 100W.  Cheap and simple using the UPS FETs.

Re: 6 METERS VEDİKAL WİND TURBİNE BLADES

Discussion Board - Sat, 09/24/2016 - 12:20
video friends have tried turning very slowly turbine
3 d d 8 volt A.C. made production
1/4.5 belt pulleys
altarnatörü re-Salinas
3 will be 30 volts A.C. d.d. https://www.youtube.com/watch?v=7Gc9rCEk7aA https://www.youtube.com/watch?v=jijbl1UIBYs https:...

Re: The OzInverter 6kW -15kW New Power Board.

Discussion Board - Sat, 09/24/2016 - 08:21
Oztules,

Thanks!

I guess maybe I should sign my salutation as "old-fart" from now on , hi, hi.

Regards, "old-fart", JLB


p.s., Anyone else have any further comment or info., or have already tried?

Re: The OzInverter 6kW -15kW New Power Board.

Discussion Board - Sat, 09/24/2016 - 04:13
The most glaring reason the Hbridge is better fiscally...

1. The transformer would need twice the VA rating in push pull..... ie you need to wind twice the primary... but at the same thickness .. so twice the copper

2. Because of 1....... the cost goes...

Re: Halbach array ????

Discussion Board - Sat, 09/24/2016 - 02:20
On my website: www.kdwindturbines.nl you find several reports about axial flux PM-generators. An overview of all free reports is given in the first folder at the menu KD-reports. In report KD 596, the 12-pole VIRYA-1.66 generator is described. Detaille...
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