We install new circuit boards,
the first " phev mode" will spoof the state of charge and force the prius to get 80 plus mpg even at highway speeds
the second " Hybrid energy manager"
( new information rebooting not required)
when the extra pack becomes depleted the prius resumes factory behavior and mpg
How far you get depends on the kilo watt/ hour rating of the pack. A prius will travel about 4 miles per kw/h therefore 10 kw/h pack will go 40 miles.
the best value right now is 7900 for a LiFeP04 with battery management system.
You would expect 20 miles, perhaps much more, of 100 mpg driving between charges.
Kim Adelman ( plugin conversions) and Steve Woodruff
Indy's partnership and AutoBeYours PHEV's
streaming audio EVcast
Just adding another battery to a Prius will not gain MPGs, many have tried.
There is an open source discussion at eaa-phev.org instead the Prius computer must be fooled into believing the state of charge is higher than it has
(calculated, counted or otherwise measured) this is done by adding a microcomputer with custom software.
After doing this, we discover that the car will get incredibly high gas mileage....but only while the added battery pack is charged....
which leads us desiring about 5kw minimum of added storage capacity
and shortly thereafter the desire to charge that new battery pack and shortly
after that the desire to charge it without destroying that new expensive battery pack
which leads us to wanting a battery management computer.( BMS)
but the BMS we buy must be programmed for the chemistry of pack we have chosen ( lead-acid, nickel metal hydride, or lithium iron phosphate, or whatever)
NiMH weighs more thatn Lithium Ion
Force = mass x acceleration
Work = Force x distance
Power = Work / time
/\Energy = Work + Q (delta heat)
Excerpt from EVworld April 2010
Upgrading LIVN GRN Kim Adelman and Mike Dibble flew in from Chicago Saturday morning, where I picked them up at the airport. They had just done an install of their Prius plug-in conversion kit on a car in the Windy City. They would spend the weekend with Judy and me -- attending the event in Lincoln -- to do several upgrades to our 2009 Prius conversion, LIVN GRN. The first upgrade was installation of a set of buttons that now allows us to control the mode in which the car is operating: normal Prius hybrid mode, all-electric mode, and blended plug-in hybrid mode. Prior to the buttons, I had to connect my MacBook laptop and run a Windows app in VM Fusionware to change the settings, which is defaulted to short-range PHEV. That mode allows us to drive up to 20 miles in blended PHEV mode, usually resulting in fuel economy ratings of better than 100 mpg. The medium range mode increases that to around 30 miles, while long range can be upwards of 40 miles with fuel economy falling in the 75 mpg range. Each mode makes a little more frugal use of the battery and little more use of the Atkinson-cycle gasoline engine. The second upgrade was to PICC's software and consists of three separate patches to improve the performance of the system. The third upgrade was to replace the small accessory battery charger with a more robust one. To test the car, we put Judy in the driver's seat and had her take her normal route to work at Omaha Steaks, with one important difference. Kim had her immediately put the car in EV-mode after it started and we drove the first mile and a half at the setting. Then before we got to the hill she climbs every weekday, Kim had her push the PHEV button. This causes the Prius engine to turn on and warm up the catalytic converter. Once up the hill, Judy put the car back in EV-mode. We drove the rest of the two miles to her office and then, all in EV-mode. The results were astounding. The computer showed that over the 11-mile trip, the car got 468 mpg! Here's the rationale behind Kim's strategy: it makes more sense to burn the gasoline the Prius uses to prep the catalytic converter while moving than doing it parked in the driveway or driving out of the subdivision at 25 mph. When you do it at 40 mph, your effective fuel economy goes from near zero to better than 70 mpg. I captured this all on video and I'll try to post it online in the near future. This is really cool stuff. Kim and his colleagues have done a remarkable job of making an already potent system even better. Check them out at Plug In Conversions Corporations. Until next time, stay plugged into EVWorld...
The AutoBeYours Battery assembly area