New consulting relationship with GreenTecAuto begins
What actually goes wrong with the batteries????
A look at todays Hybrid and EV battery packs
Battery packs exposed
Keeping Warm In New England
Plugging into the SUN
Making a small solar concentrator
Building MIMA and the plug in adapters
Converting a telephone truck to electric
DIY dual pulse Capacitor Discharge Spotwelder
Getting in shape while making electricity
Replacing gasoline with solar electric lawn equipment
What is Genesis One?
How to stop the aging process DIY
MIMA Install Day 2005 a Big Success!
Building a hybrid car grid charger
Assembling the bases
building it bigger 4.5A
Calibrating the temperature
Calibration and test of components and boards
Charger # 1 goes into beta testing
Discharger # 1 / gridcharger cycler accessory
Fan and temp boards
Getting serious
Harnesses for the Insights are nearly finished
Helpers make it go much faster
Inside the overnight charger
Modified overnight boxes
More thermal testing
Moving towards the goal line
PTC strip monitor and charger shutdown circuit
Temp volts and current calibration fixture
Test of accuracy
The code
Thermal testing.
The weather slows us down
Tapping into the Wind
Expanding MIMA with the Distribution board ( users projects )

More thermal testing

More thermal testing
one hot little box

Figured I should do some thermal testing outdoors, as it was nearly 90F this afternoon.
We punched two full sized fan holes on the prototype overnight charger. To start where the first test left off, we sealed the new fan holes so I could try the first variation.
Variation #1
75F ambient
Fan exhausting instead of blowing air into the box.
Into the box test got up to 102F, out of the box only got up to 96F, which makes sense as the replacement cooler air is being drawn in through all the louvers, so it is distributed more evenly than when the box is pressurized, and we try to blow the air out.
Variation # 2
75F ambient
I connected a second fan, which was also drawing air out of the box, and the box then stabilized at 93F.
Variation #3
Brought the test into an 85-90F outdoor environment.
Temp got up to about 106F with both fans.
Variation #4
Again sealed the second fan, and saw the box temp get up to 115F, and still rising, so I removed the tape, and after an hour we were back at a stable 107F
Variation # 5
Did not get a chance to try a final variation where one fan blew in, and one out, but expect that it will not work as well as the both drawing air out, as it would virtually eliminate any fresh air frpm being drawn in through the louvers.
Bottom line, I thing we should have two fans, and will run the 50 overnight charger boxes through the punch.