Grid Charger
Grid charger owners and location, as well as some service links for hybrid services
Grid charger code V3.0 manual
Understanding the charging and balancing process
Pack discharger
SOC reset device
Insight Battery pack lifter
Grid charger test adapters
Reprogramming the charger
Installing the Genesis One Universal grid charger in an Insight
Installing the Genesis One Universal grid charger in a First Gen Civic
Harness options
The Universal Grid Charger
MIMA Pack Whack and rebalancing the battery
Mikes Insight
EV Insight with a Prius heart
Grid charger Operating Instructions V1.2
Designing a PHEV system for the Civics, Insight 1 and 2 ------------Micro V-Buck PHEV
Doug's V-Boost
Randall's Insight
Paul's Adventures in alternative evergy
Western Washington University X-Prize car
Finding The Best Hybrid Mix
5th wheel part 2
Air cooled 5th wheel
Air springs arrive
No assist when warm
Attachment plate / Ripping the battery pack out .
Back to the 5th wheel
Back to the 5th wheel with some power in our pocket
Beefing up the rear suspension to handle the extra battery weight
Better wheel
IMA Battery Booster/Balencer/Charge controller.
Booster Battery progress
Booster pack test 1
Breaking away from the grid
Cleaning things up for the trek to Madison
DC/DC mounting and cooling
E-Wheel repair and inspection
Final 5th wheel
Finishing up the boost power supply
First full weight test
First power up of boost power supply
Got the exhaust finished
Holy Bat Dropings Robin it is an electric car
MIMA logo?
Air spring and EV wheel begin to take shape
More Prius batteries
New 5th wheel
One hour of electric priority
Portable charging system
Second boost test run
Some booster battery options
Starting to plan the trip to Madison
Test runs and 5th wheel
The Etek motor
The EV Wheel
The ideal battery for a 200 mile commute
Vboost +MIMA, a winning combo for the Insight
What is that orange tail on my Insight
E-wheel for any vehicle

No assist when warm

No assist when warm
Four of the guys reported that with the hot weather, their MIMA systems were loosing assist. Careful observation by Nemystic, and some testing by Hafnhaf with some freeze spray identified that it was a thermally related issue. I could not duplicate the problem on my test fixture, so I made a mount for the MIMA board where I could access it while driving. Nemystic brought his card down, so I would have one of the bad boards to work with. With a can of freeze spray in hand, I quickly found that Q6 the switching transistor that drives the MAMODE1 20KHZ PWM signal was the thermally sensitive component. The problem was that the MAMODE1 signal showed no measurable change between working and not working. Further testing showed that the gain of the 2N3704 transistor being greater than 100 would cause the assist to stop. Cool the transistor which drops the gain, and it works fine. I pulled out my heathkit semiconductor curve tracer, and was able to clearly see the gain change. I went through all of the transistors in my stock, and found that more than half of them had gain higher than the 100. I selected one of the transistors with a gain of 70, and replaced the part on Nemystics board, and the board became stable with no problems even when baked to 122F in the closed car. To finish the confirmation test, I selected a transistor with the highest gain of over 200, and put it into a new board that was not having the problem, and sure enough, assist stopped working as soon as the temp got to 80F. Now I need to come up with a board patch that will allow any transistor to work reliably.
Further testing with the new boards I just built confirmed that this fix works well, so if you have this problem, and want to fix it your self, just cut the emitter lead, bend it up, and after cleaning the hole in the board install the 150 ohm resistor and you should be good to go.If you want me to fix it, send the board back and I will turn it around asap.