Sunday 14 August 2011
Saturday 9 July 2011
Friday 8 July 2011
Replacing Halogen down lights with LED. Costs and photos
We just have 2 halogen down lights in our house, but I would like to use them more often that we do.
I bought a few and replaced them. They work well for lighting up the stairs. The light is more blue than the halogens but OK for here.
I tried some at a friends place with electronic transformers and they don't work. The transformers probably detect no load and shut down.
So, How much can I save?
The test voltage was 13.65v
LED Current 0.31A
Halogen Current 4.2A
At 240v with say 90% efficient transformer this equates to:
LED: 4.65W ~ 20mA @ 240V
Halogen: 63W ~ .263A @ 240V
At 30c/kWh this amounts to:
LED ~0.014 cents per hour
Halogen ~ 0.19 cents per hour
Difference is .176 cents per hour. At a cost of 9$, payback is in 5113 hours or 213 days.
This might not seem much, but the lighting energy is now 7% of what is was. I call this significant.
Before:
One of each:
After with LEDs.
Wednesday 6 July 2011
Tuesday 5 July 2011
Monday 4 July 2011
Sunday 3 July 2011
eFXC TTXGP at Easter Creek Photos and Video
Linked below are the photos and videos of this weekends TTXGP / EFXC Electric super-bike round.
eFXC / TTXGP Australia entrants #TTXGP
From left
Daniel Sailer - Ripperton Racing
Jon Eggenhuizen - Catavolt. Ridden by Jason Morris
Chris Jones
Friday 24 June 2011
Robot Wars come to Sydney
Support and entry details here.
Sunday 14/8/11
The location of Serial Space is
33 Wellington Street, Chippendale, Sydney, NSW 2008
Thursday 23 June 2011
Toy Soldiers
Toy Soldiers
Diplomats meet
And enter discourse
But can’t agree
On a Trojan Horse
While greedy capitalists
Flock like birds
And war with bombs
Instead of words
But do we know
The worlds for lease
And the contract expires
In hand with peace.
By Graham Boyles.
Wednesday 22 June 2011
EV Efficiency and pollution
I wrote this piece in response to a post on the EEV Blog to clear up some points.
------------------------
I wrote a blog post a while ago http://a4x4kiwi.blogspot.com/2008/12/co2-output-and-charging-using-coal.html detailing CO2 output. In NSW inefficient EVs are on a par with petrol. Coal power stations are more efficient that you mention. (33%-53%)
I have not accounted in this equation for how much it costs $ or CO2 to extract oil, transport it, refine it, transport it again. Not have I accounted for extraction costs for coal, but I would bet coal is cheaper on both counts.
Nissan says it takes 7.5kWh just to refine a gallon of gasoline. see http://musingsofamadman.net/2010/03/07/the-truth-about-oil/. That doesn't count extraction and transport.
Or 2kWh per Litre. We can drive an additional 10km on that alone.
But enough on the CO2 and efficiency. There are other significant factors that come into play here, cost and environment aside.
We can produce our own electricity to power cars, and do not have to be dependant on foreign oil and the associated price vulnerabilities. The point of pollution is out of the cities. A Coal fired power station is more efficient than a petrol engine, and easier to scrub the output from one power station than 50,000 or whatever number of cars.
Tuesday 21 June 2011
Vectrix Electric Motorcycle Battery Repair
A Vectrix owner has a bike that turned out to have a faulty cell causing it to have poor performance and stopping after just a few kilometres. 
I arranged a visit the bike and determine the fault.
The top of the rear block was removed and some evidence of heating and corrosion was visible on one of the cells.
Leaky cell and voltage - temperature sensors
The cell had overheated, the plastic frame the cell sits in was melted, and the pressure relief valve on the top of the cell had released causing some corrosion and crystallisation of electrolyte around the top of the cell. We verified the cell had failed electrically also. It measured only 32mV.
The others were consistently about 1.31V across them, we surmised that there was only one dead cell in the pack as the other strings of cells had a near perfect multiple of 1.31V across them.
The cells in the Vectrix are 30Ah Nickel Metal Hydride cells. From GP 
Good Cell. Some corrosion evident on terminal. This seems quite common. Cell is not swollen nor hear damaged.
Bad Cell. Corroded where electrolyte and gas had escaped through relief valve, and also swollen and heat damaged.
I later returned to the bike to disassemble the entire pack and measure each cell voltage and check for evidence of more failing or faulty cells.
The first thing to do is to disconnect the large blue Anderson
The temperature and voltage sense boards were also disconnected at the connectors at the front and rear of the bike.
The temperature and voltage sense boards were also disconnected at the connectors at the front and rear of the bike.
There are temperature and voltage sensing elements screwed to some of the battery terminals. These were numbered with a marker on each sense board and also on the cells they were removed from to ensure they were replaced in the correct locations. Each sense board was wrapped in insulation tape to prevent them accidently touching the battery terminals once removed.
One cell had over heated and the 2 adjacent cells had suffered heat damage. The plastic holders were also melted. The pack was left disassembled as 3 new cells, and plastic frame pieces were ordered from the Australian agent.
It is important that the new cells introduced to the pack are at the same charge state as the old cells. I used a digital Radio Controlled model charger to charge the 3 replacement cells. The charger also has a discharge function so I was able to discharge the cells down to the same voltage as the existing good cells. The charger can charge at 5A and discharge at 1A. The cell chemistry, charge current, end point sensitivity etc can all be programmed in the charger. NiMH cells self discharge quite quickly. A few 10s of milivolts each day. I found that after discharging the new cells to the required level, the new cells had to be discharged further to match. I got the final voltage of the new cells to within about 10mV of the existing cells. The first balance charge on the bike would balance them further. I proceed to replace the 3 cells in a string of 9. Each ½ layer of cells is bound in steel a binding strap to prevent the cells swelling during charging and discharging.
I have made a jig for compressing the packs in order to remove and replace the steel bands more easily. To make things more tricky, the brittle locating tabs
I have made a jig for compressing the packs in order to remove and replace the steel bands more easily. To make things more tricky, the brittle locating tabs
I proceed to replace the 3 cells in a string of 9. Each ½ layer of cells is bound in steel a binding strap to prevent the cells swelling during charging and discharging.
An interesting point is that each cell is electrically insulated from the next by plastic spacers.
Reassembling the pack consisted of reversing the disassembly process. Extra care was taken to double check visually and with a volt meter that each 9 / 8 cell bank was reassembled correctly and the temperature and battery voltage monitoring sensors were installed in the correct locations.
All interconnects and battery terminals that had been removed were tightened to a specified to torque of 10Nm.
After reassembly the owner took the bike for a ride and came back with a memorable grin. The bike performed better than it had for a long time.
The final task for the owner is to deep discharge the pack 5 times to condition the batteries and ensure longevity of the new batteries. This procedure is recommended by Vectrix to remove any ‘memory’ effect in the batteries in order that they can provide the maximum usable capacity.
Friday 20 May 2011
Monday 2 May 2011
Grafiti
Not that I condone grafiti at all however I quite liked this stylised face drawn on the bus seat thismorning.
Wednesday 6 April 2011
The ute has gone to a new home,
I finally sold the electrolux. It was picked up to be take to Perth a couple of weeks ago.
Here it is leaving my place for the last time.
It is destined to have new life breathed into it with a new VFD and some 30Ah Vectrix electric motorcycle batteries.
My 'new' BMW E30 318i may become my new project :)
Here it is leaving my place for the last time.
It is destined to have new life breathed into it with a new VFD and some 30Ah Vectrix electric motorcycle batteries.
My 'new' BMW E30 318i may become my new project :)
Monday 14 March 2011
BMW E30 1st Electric Conversion Post
Well I finally bought an E30 BMW 318i Coupe, with a manual gearbox.
Great fun to drive. It is a bit bogan, so like the ute, I will remove the tinting and put a chrome grill insert back into it.
If it does become an EV, then it will most certainly need to have some respectable times at the drags!
E30 Specifications
Here are some pictures to get started.
Saturday 26 February 2011
Wednesday 23 February 2011
555 Contest Entry
Background.I was excited when the 555 contest was announced to recognize the most used Integrated Circuit ever.
After considering for a while what I could do for the competition, I started thinking about how best to celebrate the 40 years that the device has been around and the 10s of billions produced.
I have often admired home built computers that use discrete components so I though, I will make a 555!
This 555 project recreates an operational 555 timer using discrete transistors, resistors, diodes and capacitors.
It may not strictly conform to the competition rules, but I thought it would be fun and original anyway.
Initial Research.
I downloaded a few 555 datasheets from various manufactures only to find that the circuits often have subtle differences. Eventually after some Googling I located a scanned copy of the original Signetics datasheet from dapj Circuits, Including the Equivalent Circuit below.
After inspecting the circuit, I noticed Q19 is rather unusual and has 2 collectors. How can I implement this using discrete components? I decided to simulate the circuit using the brilliant and free Java app from falstad.com to make sure it worked and to quickly experiment with different arrangements for Q19.
Arranging the resistor on the base of Q19 as in the simulation works perfectly. If I used 2 transistors to replicate the original Q19 design, the circuit did not oscillate.
Construction
In order to simply construct the circuit to show its operation and at the same time preserve the original authenticity, I photocopied and enlarged the Philips schematic, glued it to some card and inserted the components through the card and used point to point wiring on the rear of the card.
Component side of card.
A pin was used to poke holes in the card to insert the components. This was a surprisingly quick method of building the circuit. For prototypes of simple circuits I may use this technique again.
the only thing I might do differently is to paste a reverse image of the circuit onto the wiring side of the card in order to avoid wiring errors.
Testing
In order to test it works, I attached an LED to the output and suitable timing components, Ra, Rb and C to give an approximate 1Hz flash rate.
the final testing can be seen in the this video.
Making it presentable
The final thing to do is to make the project presentable. I decided the inside of an old data book would be appropriate. I found a copy of a suitable book on the 'free' table of my local ham radio club, the Manly Warringah Radio Society.
The final thing to do is to make the project presentable. I decided the inside of an old data book would be appropriate. I found a copy of a suitable book on the 'free' table of my local ham radio club, the Manly Warringah Radio Society.
This was the first time I have used a book as an enclosure. It works well if you are not in a hurry, which I wasn't. I followed the guide by Bre Pettis from Make Magazine. (Cool guy who I had the pleasure of meeting at a Maker Faire in Austin, Tx.)
One half of the book was cut to accommodate the circuit, while the other half was to house a battery, the 555 timer data sheet and memorabilia.
Right hand side of book contains the circuit
The left hand side of the book contains A5 printed copies of the Philips data sheet, The 555 Timer Wikipedia page and finally an interview with the 555 inventor Hans R. Camenzind.
The finished project closes nicely into the book for safe keeping.Finished project in operation
Saturday 19 February 2011
Friday 11 February 2011
WWF - Living Planet Report 2010
WWF - Living Planet Report 2010
The report, a leading statement of the planet's health, found that people are spending beyond the Earth's ecological means and dipping far into the Earth's natural capital. The ecological deficit caused by consumption of energy, water and materials at rates 50 per cent beyond supply will have serious repercussions for wildlife and ecosystems, as well as for future generations of people, all of whom depend on nature's ecological services.
Australia is #8 and New Zealand has the 32nd most heaviest footprint.
The report, a leading statement of the planet's health, found that people are spending beyond the Earth's ecological means and dipping far into the Earth's natural capital. The ecological deficit caused by consumption of energy, water and materials at rates 50 per cent beyond supply will have serious repercussions for wildlife and ecosystems, as well as for future generations of people, all of whom depend on nature's ecological services.
Australia is #8 and New Zealand has the 32nd most heaviest footprint.
Monday 7 February 2011
Monday 17 January 2011
ELECTRIC TRUCKS GAIN TRACTION--Carl Schwab - IEEE Consultants' Network of Long Island
I have believed for a long time that there is more to gain by electrifying commercial vehicles rather than passenger vehicles
ELECTRIC TRUCKS GAIN TRACTION--Carl Schwab - IEEE Consultants' Network of Long Island
ELECTRIC TRUCKS GAIN TRACTION--Carl Schwab - IEEE Consultants' Network of Long Island
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