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 on: May 24, 2017, 05:30:59 PM 
Started by rich.carroll - Last post by jeffrey.miller
This is a nice incentive.  Also seems like a good way to work on clearing out the old design before announcing the new design. 

 on: May 24, 2017, 11:39:24 AM 
Started by rich.carroll - Last post by rich.carroll
Through our friends at Chicago Area Green Cties initiative, we are aware that ComEd has partnered with Nissan to offer an additional $10,000 rebate on new Leafs.  This is in addition to the potential $7,500 tax credit offered by the IRS. Leafs, which have Manufacturer's Suggested Retail Prices (MSRP) starting at $30,680, now should start about $13,180 after the consideration of the rebate and tax credit.  If you thought you might be in the market for a new EV, and the Leaf fills your needs, it would really be worth your while to investigate this closely.  Deal is only available until 6/30/17, or while supplies last.  Essentially, that's a new EV with a 50% +  discount. What do you need to do? Bring the flyer https://www.comed.com/SiteCollectionDocuments/SmartEnergy/NissanLeafFlyer_June30_2017.pdf and a copy of your ComEd bill to the Nissan Dealer.
 Thanks, ComEd!

 on: May 11, 2017, 02:48:18 PM 
Started by jeffrey.miller - Last post by jeffrey.miller
Power is back on, they are tidying up the last of the stuff.   

 on: May 10, 2017, 10:55:24 AM 
Started by jeffrey.miller - Last post by ted.lowe
Great to hear Jeff.  May the force be removed and returned to you in that single day!  Grin

 on: May 09, 2017, 07:42:36 PM 
Started by jeffrey.miller - Last post by jeffrey.miller
Refreshed the listing for this car this evening and the lead picture has "sold" inserted on it.  I am guessing that means a customer has committed to buy it but hasn't taken delivery yet.  Just over two months to sell a rebuilt Tesla for $30K.  These things are moving well!

 on: May 09, 2017, 03:00:09 PM 
Started by jeffrey.miller - Last post by jeffrey.miller
I have a building permit for the first phase (upgrade to 400A service) and an electrician scheduled to perform the work Thursday the 11th of May.  They are planning to complete work in a single day with 3 people.  Assuming I have power the night of the 11th I will post if they succeeded.  Smiley

 on: May 02, 2017, 12:27:57 PM 
Started by jeffrey.miller - Last post by jeffrey.miller
Another detail that has come from my discussions around this is that the local inspector matters.  Every town has their own inspector and those people have differing opinions on topics.  Speaking to the inspector before a big job like this is certainly a good idea as there are details that are smaller than what is covered in any code book.  This can cause rework on jobs because the inspector doesn't like how it has been done.  One of the factors in me selecting the larger group was that he does this same job in many towns and he takes the most stringent requirements from each of the towns and applies it to every service upgrade.  This limits the chances for rework and helps him be more successful.  These are often very small details down to choosing between two perfectly acceptable fittings. 

Getting buy in from the local inspector is an important step in any project that you want pass on the first inspection. 

 on: May 02, 2017, 10:16:27 AM 
Started by jeffrey.miller - Last post by jeffrey.miller
I have located an electrician for the service upgrade.  His company frequently does service upgrades and he brings out three people to run through everything in one day.  I don't have a date yet, but assuming obtaining the permit doesn't take forever, it will be in the month of May. 

I met with another electrician that I will probably work with on future phases of this, but as he works alone he couldn't get through the job in a single day.  He was willing to put temp power in place but the process was going to take longer and potentially cost as much if not more money.  He also doesn't do as many in a year as the bigger company, so I get the benefit of that experience. 

On the Comed front of the in ground wire, I called their 800 number and asked what would be required from ComEd to get this service upgrade going cost wise.  The agent opened a case with the Crystal Lake city ComEd rep.  That rep called me a couple of hours later and told me the wire in the ground was the proper size for 400 already and that they would inspect it once the city had completed their inspection.  Comed would then send a tech out to replace the meter.  According to the Comed person the meter itself wouldn't fit in the new base properly. 

No electrician I have spoken to expects that to be a problem, but they have a hard time mentioning recent jobs specifically upgrading 200 to 400.  Such is life as an early adopter. 

I will provide more details about the job and the contractor once the job in complete. 

The most amusing discussions have come from the 150 Amp breakers and the fact that not only do they exist, that I have two of them in my possession.  If you recall they are MUCH larger than a normal 2 pole breaker and the shock and then amusement when these guys hold these massive things for the first time is quite hilarious. 

 on: April 30, 2017, 07:55:45 PM 
Started by jeffrey.miller - Last post by jeffrey.miller
At the meeting we briefly touched on lighter weight Kevlar material and I mentioned I don't bother because the cost is about the same as the heavier stronger cloth, I was wrong, it is actually more expensive!


The 1.7 ounce is showing 28.50 per 38" wide yard.
The 5 ounce is showing  17.50 per 38" wide yard. 
Usually we end up buying the 60' wide roll which is presently 25.50 per yard at close to double the width.  More strength, less math, and considerably less cost. 

 on: April 30, 2017, 06:54:57 PM 
Started by jeffrey.miller - Last post by jeffrey.miller
To calculate the proper foam to make the fabric the weak link we can take our experimental data and extract some lessons learned and then extrapolate. 

The foam failed when its crush strength was equal to roughly 10% of the compression load on the fabric.  (this data is only valid for this fabric in a single layer with Epoxy)

Considering that fact for a moment I previously calculated that the fabric had a strength of 39,900 in those panels.  That means the foam would have to withstand 3990 pounds of crush force over a 12 sq in area.  This is assuming the combination of the two things interact identically, but if we run with that.  That means that foam with 332.5 PSI in compression would be equal in strength to the fabric in this build.  I am extrapolating roughly a 20x value, so the margin of error is large to say the least.  If I was so inclined I could build a panel out of the 250 and 580 PSI Foam and see what happens, when I break them.  I would make them much smaller, so we don't need 8000 pounds to break them though. 

The early test strips were generally 2 inches wide.  If that was made out of one of these two higher density foams and the same single layer of fabric it would hold 1/8th the weight, so 2 inch wide 3 inch tall would hold just shy of 1000 pounds.  The foam would be dimensions 3*2*32, the heaviest foam would be just 0.9 pound, and the next foam down would be 0.45 of a pound.  The fabric and epoxy would add about 2 ounces to that.  One or both of those builds should cause the fabric to fail.


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