Hi LMT, and a belated welcome to this forum. You might update your profile to let us know whereabouts you are located.http://myimiev.com/forum/viewtopic.php?f=13&t=3196
In the engineering world, prior to undertaking any electrical design, we first go through a systems design process, clearly identifying the requirements and studying all the tradeoffs to arrive at a cost-effective solution.
…Just got my i
2010 model and looking for solar hack to charge main pack… my current intention is to have:
solar panel 200+W > battery charger > battery > power diode > connection to regen system.
so battery chargers during day light hours and adds to regen when braking occurs in D, E or B… i understand even if i can get it to work ill only be getting a couple of km extra a day but i think thats cool.
In this case, my take is that you are wishing to undertake a design implementation, the efficacy of which is, at best, questionable, but also recognizing this fact with wide-open eyes. It sounds as though you want to make a science project out of this, without regard that it may, at best, extend your range by, say, 5km after a day of sitting out in the sun. Perhaps you wish to drive your car to work and have the solar panel add a few Wh while the car is parked (something a number of our members have actually needed to do, but eventually gave up the idea as impracticable).
[I just deleted a detailed math analysis of what you're trying to do, as both PV1 and Don touched upon this adequately.]
Bottom line, if you wish to pursue this then either design or find yourself a dc-dc converter that takes a very variable input low voltage and outputs something on the order of 350vdc, and then figure out where to inject this into your battery pack (there are a number of different spots, depending on whether you have CHAdeMO or not). Also, you might refrain from using the term "regen" for anything other than the electric motor feeding the battery while acting as a generator.
Wish you all the best in your endeavour.
PS An extra 5km of range can be accomplished extremely easily in the i-MiEV by simply altering your driving behavior ever-so-slightly.