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Re: NEMA L14-30R vs NEMA 14-50R?

Fri, 08/29/2014 - 18:15
Because the two coils are wound over the top of each other, and on both sides of the rotor, you can pull 50 amps from one coil without burning it out, or 31 amps from both, the heat generated is about same and it is more or less just as evenly spread o...

Re: Active or passive solar PV hail protection

Fri, 08/29/2014 - 17:58
Frank S,
My solar panels are surrounded by cattle panels made with 1/4" bar. If there is a difference in output, I don't notice it. Bear in mind, I do have 7100 watts of panels. Small differences aren't too noticeable.

Sliding shudders would work if t...

Re: Active or passive solar PV hail protection

Fri, 08/29/2014 - 16:10
Phil what I am thinking of would either slide or be shutters probably controlled by an anemometer.
 My thinking is at least in this part of the country hail is 95% of the time accompanied by wind gusts  in excess of 50 MPH
 there is a wire mesh reinfo...

Re: Active or passive solar PV hail protection

Fri, 08/29/2014 - 15:53
Quote from: MaryAlana on August 29, 2014, 02:36:58 PMI would think a stowable shield would be best. Usually have warning when bad hail is approaching and could deploy it. Protector that slide into the racks in front of the p...

NEMA L14-30R vs NEMA 14-50R?

Fri, 08/29/2014 - 15:17
I just purchased a 7500 running watt portable gen-set that has 1 NEMA L14-30R 120/240 30amp receptacle and 1 NEMA 14-50R 120/240 50 amp receptacle and have a question. If you do the math 7500 watts / 240 volts = 31.25 amps. How can the NEMA 14-50R be r...

Re: Active or passive solar PV hail protection

Fri, 08/29/2014 - 14:36
I would think a stowable shield would be best. Usually have warning when bad hail is approaching and could deploy it. Protector that slide into the racks in front of the panels.

That polycarbonate sheet becomes brittle with age. One more year and I am ...

Re: ATmega328P for OpenTRV use

Fri, 08/29/2014 - 14:15
Another day, another video!

http://youtu.be/x1xR1CiCzvg

Rgds

Damon

Re: Blade theory questions

Fri, 08/29/2014 - 14:07
SparWeb, very thank you for your input.
When I quickly flew Lissaman / Walker article I quickly realized that my knowledge of mathematics is no longer as it was when I was a student 13 years ago. I newer was a wizard in mathematics, but I was fairly we...

Re: Active or passive solar PV hail protection

Fri, 08/29/2014 - 10:38
I've been thinking about some sort of protection also. I lost 2 out of 8 panels about two years ago to baseball sized hail. People in the area lost new cars, pickups and roofs. I still feel fortunate.

Here's a few of my 'might work' ideas:

1. large hol...

Re: Electric Lawnmower Motors: Great Generators?

Fri, 08/29/2014 - 05:52
to make use of those mags you would need to rewire the armature with more turns  and finer wire.

Re: A 6pac of Trojan 105s

Fri, 08/29/2014 - 05:47
I was standing out side the garage door with a circular saw in  my hand but the dog was in the garage.  took a while before she felt sare enough to go back in the garage.  good luck with the batteries.
gww

Re: Active or passive solar PV hail protection

Fri, 08/29/2014 - 02:04
Actually I think they may use expanded metal .
 Shading could be a problem even with chicken wire though. that I one reason I am thinking about a stowed deploy-able shutter system.
 Should next year transpire as I hope, I might be increasing to 3 or ...

Re: Active or passive solar PV hail protection

Fri, 08/29/2014 - 01:44
Storm chasers put heavy chicken wire in front of their windows, it breaks the hail into smaller pieces.

Re: Active Pitchcontrol

Fri, 08/29/2014 - 00:58
A lot of progress in the development of active pitchcontrol.
Variable pitch propellers and micro-controllers.
You can create an invasion with a 1000 drone squadron.
The technical application we use to control our windmills is simple.
Can be booming.
  ...

Active or passive solar PV hail protection

Fri, 08/29/2014 - 00:09
 I was wondering if anyone has given any serious thoughts to a system to afford some protection to an array in the event of a hail storm.
 My array about the only way I have to offer any protection to my panels is to attempt to determine the direction ...

Off grid / Grid tie Solar +safeties & SOP's+ user's feedback

Thu, 08/28/2014 - 23:56
Avoiding the risk of further Hijacking a thread I am starting this one
 
Bruce S
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Re: 100% off grid shed with Ebay stuff.
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Re: Active Pitchcontrol

Thu, 08/28/2014 - 14:04
Can we say active pitchcontrol is booming?

Re: Electric Lawnmower Motors: Great Generators?

Thu, 08/28/2014 - 12:25
Thought about these models for the next VAWT project.
Then a few months later, I found a 24 volt Yardworks cordless lawn mower at the dump. Brought it home, removed the blade and hooked it up to a cord drill, ran at 1150 rpm and got 7.45 volts. So, it ...

Re: lightning takes out inverter.

Thu, 08/28/2014 - 08:40
madlabs

Thanks for the info,  I may get around to that some day, although I will probly regret not having it done the next lightning strike.  time will tell.
Thanks
gww

Re: 100% off grid shed with Ebay stuff.

Thu, 08/28/2014 - 07:38
Frank S ;
It is a perfect time to have said so too!
I am in the midst of looking (window shopping at this time  ) into having our house retro-fitted with about 6Kw of panels.
MO is a state that isn't so nice about giving incentives (we're only at 92...