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Updated: 33 min 30 sec ago

Re: rewound 5kw generator

1 hour 39 min ago
There is a lot of space, the original winding was 3.2 pounds of copper.

i put about 5.5 pounds of copper. and the slots are not even half full.

after finishing the winding, i used about 200 nylon zip ties to hold the winding together, at the e...

Re: bad batteries?

2 hours 8 min ago
Just a different solar charger is all you need if you are charging from panels.  I imagine you have one of the more economical PWM chargers and many times those aren't real adjustable.  MidNite solar makes some good ones that should work nicely.  Check...

Re: bad batteries?

2 hours 17 min ago
Thanks again.
These are batteries used in a 12 volt system.

I seldom go over 6 amps on the charger, and mostly use the 2 amp setting.
The charger does not seem to go above 14.6 volts before it seems to put on a float charge.
It then cycles between 2.5 ...

Whuisper 500

3 hours 56 sec ago
Has anyone fitted a three blade rotor to a Whisper 500?  If so, whose blades, hub, etc. did you use?  Thanks.

Re: ATmega328P for OpenTRV use

5 hours 19 min ago
Damon, I LIKE the 8-bit AVR processors.  They are rock solid and make better use of flash than 32-bit does.  And they are lower power consumption.  I think you are on the right platform for that application.  If your codebase eventually runs out of cyc...

Re: bad batteries?

5 hours 25 min ago
Quote from: wine_guy_3 on Today at 01:59:16 PM
thanks for the inputs on the charge voltage.
Where did you find the info on the batteries? I couldn't find any.

any idea what the SG will settle out to be?

w...

Re: ATmega328P for OpenTRV use

5 hours 31 min ago
Thanks Chris.

I hope to be on an ARM device for our next product round; cheaper and faster and more effective code space.  But the AVRs are well engineered and full of features that I would have been all over 30 years ago when trying to build a toy rob...

Re: Maxing out my small off-grid system

5 hours 38 min ago
Quote from: SparWeb on August 06, 2016, 12:08:41 PMLooks good:  I can see Bulk + Float appear in the plot.

Even clearer here:

http://www.earth.org.u...

Re: bad batteries?

6 hours 15 min ago
Years of experience with those very batteries   

The SG is on those is low and ends up at 1.250 after an equalize charge, and usually 1.220 - 1.230 (depending on temperature) after a normal charge.  They are actually designed to be charged by common ...

Re: bad batteries?

6 hours 34 min ago
 
thanks for the inputs on the charge voltage.
Where did you find the info on the batteries? I couldn't find any.

any idea what the SG will settle out to be?

Re: rewound 5kw generator

7 hours 7 min ago
Looks like from the photo...theirs a lot of left over space in the slots...not sure if that nylon tape will last long..with the vibration...might want to glue those coils down tight ? Looks great otherwise.

Re: Help with motor conversion

7 hours 16 min ago
Always thought that wasn't advisable ...as in making slots in the metal rotor..distorts the magnetic field..end up with a weaker magnetic field being directed towards the coils..

Re: Help with motor conversion

9 hours 45 min ago
one way to hold the magnets is to cut slots slightly deeper than the magnet, peen the edge of the metal over.

Re: Revisiting rectifiers

12 hours 11 min ago
Does anyone else have any input on this "old" topic?  The ebay link comes up fine, and I could get that one.  Would one suffice, and is the heat sink on it big enough, or would a bigger one be better?
Are there any other options like say one out of a c...

Re: Help with motor conversion

13 hours 9 min ago
Thanks Adriaan and joestue.  It is a 36 slot stator.  Your right that the coil spans are only 9 slots.  I'm thinking it's 12 coils 4 per phase.  Each coil fills 3 slots as the outside winding fills a whole slot and the inside fills only half the slot a...

Re: Blind battery refill

14 hours 7 min ago
Somebody make coffee.

David's didn't work on one cell from not enough voltage.
I suppose the circuit could be build "backwards" for that cell. Don't know why we didn't think of it at the time.

For something not self powered, could use Sir Flux's idea. ...

Re: Help with motor conversion

18 hours 37 min ago
Do you have a 24 or a 36 slot motor?
are there any empty slots?

Adriaan, i've never heard of a motor that is wired with coils that are wider electrically than they need to be, they are always narrower so to speak. but perhaps its just semantics.

for e...

Re: 5kw Poncelet Wheel Project

19 hours 14 min ago
Quote from: David HK on August 22, 2016, 02:51:55 AMTake the Boulder Dam and many others for example

they are grandfathered in, i really don't know of any new major dams that have been built anywhere in the usa, and ...

Re: Blind battery refill

22 hours 28 min ago
Quote from: David HK on February 12, 2016, 02:55:51 AMI worked all this out on this website years ago.

Ghurd helped me. I have just tried researching and cannot trace anything. I have also checked my old PCB Express files and ...

Re: ATmega328P for OpenTRV use

Mon, 08/22/2016 - 12:23
Kind of a cool project.  While not controlling energy usage, I use a AT Mega 2560 chip on an Arduino board to control and fly my homebuilt fully autonomous quadcopter.  It runs the ArduPilot flight stack.  I'm building a more advanced version using a 2...