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Re: Windscreen wiper for Wave energy

3 hours 25 min ago
Thanks for the video tip with the TV show, that's great to see.

I don't want to use a heavy float because I then have to build a heavy float, and it needs space. Boats already exist, so it's a kind of parasite generator.

Thanks for your thoughts thou...

Re: Harbor Freight Solar set as a starter set?

Mon, 05/02/2016 - 18:10
Thanks for all the information, I kind of figured the HF set was a no go, but wanted to see what people actually thought, interesting about how the price has gone up.. meant to respond earlier in the month when I first posted, but always thought about ...

Re: Windscreen wiper for Wave energy

Mon, 05/02/2016 - 18:06
Quote from: electrondady1 on March 23, 2016, 05:37:40 AMi live near the water  so i know what your talking about . i always thought something that worked along the lines of a small motor pull starter would work .  a float t...

Re: feeding a grid tie inverter with rectified single phase?

Mon, 05/02/2016 - 16:54
I've not actually tried it yet - not enough time to play, and some reluctance to take the hydro off-line whilst I rearrange the wiring.
It's a 2hp motor wired delta - so I guess I could see if it starts with 50 or 100uf and take it from there.

What I c...

Re: Sense check on wiring resistance please...

Mon, 05/02/2016 - 10:59
I put in the new wiring, which mostly went as expected, and did significantly reduce the sag as seen at the load.

Now I added some more load and the sag is back.  B^>

But it is more load that I'm taking off-grid, even if small.  I'm trying a new scheme...

MOVED: new renewable

Mon, 05/02/2016 - 09:10
This topic has been moved to Quarantine since commercial content is NOT suitable for a first post without establishing your credentials, and of this nature without establishing that this is not ...

new renewable

Mon, 05/02/2016 - 07:51
We are looking for anyone interested in becoming involved in a new system design that allows the collection and storage of very large amounts of renewable energy that can be transmitted long distances with very low losses, and drawn from at will with v...

Re: 2hp 3 phase. Open forum. Rewind for best low speed output

Sun, 05/01/2016 - 19:58
 I'm really not discouraged. Quite the opposite actually. It is nice to see it turning consistently, even if it is a slow rotation generating NOTHING. LOL.
I do have some work to do to get this axial flux machine generating a consistent 200mA @ 28Volts...

Re: feeding a grid tie inverter with rectified single phase?

Sun, 05/01/2016 - 17:42
How is the single phase motor starting now?

With that long run of cable I wouldn't worry about hot plugging capacitors, even if they are relatively large.

usually the starting uf for 3 phase motors is 100uf per hp at 230v nominal mains iirc.
100uf at ...

Re: New battery bank, what to buy?

Sun, 05/01/2016 - 09:25
Just my .02, so that is what it's worth...

I think to some degree it depends on your usage style. I have 16 cheapo Sam's club golf cart batteries in a series/parallel for 48V. They are all coming up on 8 years old and though they show some signs of age...

Re: Direct Drive Washing Machine motor as Alternator: upgrade PM's to Neo

Sun, 05/01/2016 - 01:27
Good discussion there Sparweb..... but in this case I think Flux hit it on the head... this fellow is not trying to increase voltage from the looks of it, just to up the grunt... for the F&P the only way is really to use capacitive coupling ( not doubl...

Re: Direct Drive Washing Machine motor as Alternator: upgrade PM's to Neo

Sat, 04/30/2016 - 23:30
Hi Ron,

I experimented with these on my turbine, a few years ago.

http://www.fieldlines.com/index.php/topic,140926.0.html

Don't worry about the missing images from the first few posts - I replaced them in an update recently.
Hope it fills you in a lit...

Re: 2hp 3 phase. Open forum. Rewind for best low speed output

Sat, 04/30/2016 - 23:22
Don't be discouraged!
My first axial flux PMG wasn't very good either.

While I haven't built a Lenz turbine myself, it seems to be resilient in poor wind sites (judging by comments from others).  If you have a really turbulent site, do you really think...

Re: Direct Drive Washing Machine motor as Alternator: upgrade PM's to Neo

Sat, 04/30/2016 - 20:06
"I'm unable to find the Back Shed posts about capacitors... but multiplying voltage doesn't really help me, and capacitors won't multiply power."

Then suggest you learn to search better... It will save you a lot of wasted effort. That site has done it ...

Re: Direct Drive Washing Machine motor as Alternator: upgrade PM's to Neo

Sat, 04/30/2016 - 17:29
Quote from: joestue on April 17, 2016, 03:47:10 PMIncrease the number of magnets, rewire it. also looks like you can fit a lot more copper in there.

You have many options, all of them are better than 24 magnets, I don't kno...

Re: feeding a grid tie inverter with rectified single phase?

Sat, 04/30/2016 - 17:24
hmm, well the line from the hydro is about 110m and fairly thin cable so resistance is significant.

The inverter can handle the start current for the motor (particularly, as you say, with the long line) but if it is to start the 3ph motor on 1ph, there...

Re: feeding a grid tie inverter with rectified single phase?

Sat, 04/30/2016 - 16:34
you can spin the motor up, then connect it to the inverter. either connecting the inverter to a stopped motor, or connecting the inverter to an over sped hydro, will result in close to locked rotor amps in either case.

Hot plugging the hydro motor in ...

Re: feeding a grid tie inverter with rectified single phase?

Sat, 04/30/2016 - 16:10
OK, that's reassuring, I might give it a try then. In theory, if I'm aiming for 1540ish rpm (1420 at full load as a motor) my runner is ~10% too large - so I'm not sure how much that will affect my efficiency.

I still have questions for the experts on ...

Re: Direct Drive Washing Machine motor as Alternator: upgrade PM's to Neo

Sat, 04/30/2016 - 15:46
Yes Gordon ( Gwatpe) did a lot of work with caps on F&P over on the back shed, and managed to get 1kw out of a single stator... it had doublers and tripplers.

However, you can get a very substantial increase just with series capacitors, as attested by ...

Re: 2hp 3 phase. Open forum. Rewind for best low speed output

Sat, 04/30/2016 - 10:07
 I have stopped to assess my situation. It appears I have more turbulence then I had first thought, which makes any lift wing (lenz2) design non applicable. I'm still toying with a few designs and sizing up my coil/magnet configuration.
 I may have to...