EMP resistant?

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Re: EMP resistant?

Postby variflex » Wed Aug 17, 2011 12:51 pm

I'm sure I could insert a Power Balance Band joke here but would probaly not be condicive to the topic
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Re: EMP resistant?

Postby masonranch » Mon Sep 22, 2014 4:21 am

An EMP puts out 100,000 Trillion watt burst. Your local 50,000 watt radio station signal might be a few microvolts in your receiver. 100,000 Trillion watts is 2 Trillion times your local signal. 2 Trillion time 1 microvolt is 2 million volts and it all happens in a nano second. It is like placing metal in a microwave oven only one really big spark.

So NO solar panels nor Inverters tied to unshield lines or feeding a house that isn't a Faraday Cage will survice an EMP. Solar Panels can be sheilded with a fine wire grid or metal mesh that doesn block too much light, but real care needs to be exercised to make sure there are no paths for the EMP.

I haven't found a solar panel manufacturer that makes shielded PV panels. As a previous poster pointed out, store your EMP Emergency PV system in its entirety, in a Faraday cage, that's the only way you will have anything but a useless pile of junk after an EMP.

To test your what you think is a Faraday cage, tune a battery powered radio to the strongest FM station you can find. Put it inside your Faraday cage. If you hear anything but static, your Faraday Cage is not a Faraday cage.
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Re: EMP resistant?

Postby Tracker » Tue Sep 23, 2014 9:03 am

..
Interesting thread..
I can't remember being so... ummm. Abrasive... :oops:
Must have been the red wine..
..
.
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Re: EMP resistant?

Postby offgridQLD » Thu Sep 25, 2014 6:43 pm

Its funny how when dooms day scenarios are drawn up a relationship between having some of your mod cons and the word (survival) is put into the same category.

I would put having your PV functioning ofter a EMP event a Comforting outcome more than survival.

For most people in a dooms day scenario food will be there shortcoming though I guess if you have power you can be starving with the lights on and stereo playing your favorite tunes :lol:

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Re: EMP resistant?

Postby Tracker » Thu Sep 25, 2014 7:26 pm

...
"... we'll meet again, don't know where, don't know when.."

Comes to mind... ;) ...softly coming from the mp3 player..
..
.
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Re: EMP resistant?

Postby masonranch » Mon Sep 29, 2014 12:44 am

offgridQLD wrote:For most people in a dooms day scenario food will be there shortcoming though I guess if you have power you can be starving with the lights on and stereo playing your favorite tunes :lol:
Kurt


Maintaining a freezer and refrigerator and the ability to run a submersible well might be a little more important than music. Running a generator just 1/2 hour a day will keep stuff frozen in a freezer if the door isn't opened much, What good is a garden or meat you harvest if you can't preserve the food? Also during the 1/2 hour run batteries can be recharged. Any wood burning appliance runs much more efficiently if the blower fan is operating. It doesn't take much and can be run from the batteries (charged by the generator) and an inverter kept in a Faraday cage until needed. Running a propane fired generator 1/2 hour a day with typical load and a 1,000 gallon tank will last 26 years or an hour a day 13 years etc. Propane, as opposed to Gasoline and Diesel never fouls or turns to varnish. It will still be good in 26 years, that is why it should be propane. Solar panels, unless part of a whole house Faraday cage, will be fried by an EMP. Likewise the generator must be in a Faraday cage when not in use or it too would be fried,

3158s.jpg

7 KW Generator in a EMP Faraday cage. Hole size 1/2 inch i.e. 1 Ghz

Spectrum.JPG
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Re: EMP resistant?

Postby davidg » Mon Sep 29, 2014 4:04 pm

Does the cage go under the generator as well ?
The wire mesh seems to have fairly large open weave.
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Re: EMP resistant?

Postby masonranch » Tue Sep 30, 2014 12:22 am

davidg wrote:Does the cage go under the generator as well ?
The wire mesh seems to have fairly large open weave.


Yes it goes under the generator, The plywood was inserted later so the wheels wouldn't tear up the aluminum mesh.

The mesh is 1/2 inch. As mentioned previously, it is designed to stop radiation up to 1 Ghz (pulse attenutated 10,000 to 1 or 50,000 volts/meter to 5 volts/meter). 1Ghz has a period of 1 nanosec. Light travels 1 foot in 1 nanosec. This is the wavelength. The general rule is holes should be 1/10th of the wavelength or 1.2 inches. The conservative rule is 1/20th of the wavelength or 0.6 inch. That is why I chose a 1/2 inch mesh. This is open enough that I can run the generator without removing it from the cage, as it is sort of hard to get it in there. Again once the ends are off to access the propane on one end and the electrical outlets on the other. it no longer is a Faraday cage until the wires and hose are disconnected and the ends replaced.

The frequency content of the EMP is calculated from the observed and calculated time spectrum.

Pulses.jpg


'
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Re: EMP resistant?

Postby davidg » Tue Sep 30, 2014 7:19 am

In a photo you can't tell what size it might be, hence the question. When I was in the army forever ago we used to use brass flywire type mesh for Faraday cages, I was in signals. We used them for setting transceivers allowed verification of frequency without interference.
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Re: EMP resistant?

Postby masonranch » Tue Sep 30, 2014 10:31 am

davidg wrote:In a photo you can't tell what size it might be, hence the question. When I was in the army forever ago we used to use brass flywire type mesh for Faraday cages, I was in signals. We used them for setting transceivers allowed verification of frequency without interference.


To be safe a Faraday cage is usually solid sheet metal like the Home depot metal trash can ($25). Your VHF/UHF transceivers were lower frequency and thus bigger holes could be used. A mesh that transmits most of the light is what is required to protect solar arrays. You can see that 75% of the light passes through the mesh I use. A solar array that is part of a Faraday "House" will survive an EMP. This book is excellent in describing how to have a survivable array.

http://www.amazon.com/EMP-Protect-Family-Community-Encyclopedia/dp/1484909852/ref=sr_1_1?ie=UTF8&qid=1412035957&sr=8-1&keywords=don+white+emp

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EMP – Protect Family, Homes and Community provides a unique perspective on EMP protection. It discusses how to EMP protect homes, commercial and industrial buildings from family size to villages and towns. It presents an overview of how to shield, bond and ground buildings and how to surge suppress and filter cables. It includes a novel perspective on how to pay for all of this, even without government subsidies, rebates or tax credits. EMP protected solar and battery backup power ensures a 24/7 supply of electricity both before and after an EMP event. With EMP protection, lifestyle or the quality of living, increases from barely existing (as projected for the best situation in most scenarios) to thriving in a post-EMP situation for prepared communities, with further improvements and little job loss when these protections are extended to the town or county level. Chapter 2 presents a new and creative approach to "A Proposed National Plan for EMP Protection in two phases. Phase 1, a two year program, develops a few experimental EMP protected villages located in the North and South USA and coastal and inland. They become tailorable templates for high awareness, videos, seminars, webinars and training. Based on a wealth of analytical and pragmatic information learned from Phase 1, Phase 2 is fulfilment over an eight year span at many of USA counties. In addition to improved survival,
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