AVR modified EV charger

[Gary]‘s built some nice AVR projects. The most interesting is the charge controller/monitor he built for his EV Porsche. Each board controls a charger – with one charger per battery. When the system isn’t charging the batteries, it provides real-time data to a VFD display in the dashboard of the 1978 Porsche 924. Hopefully he’ll notice the spike in traffic and will update the charger project page.


  1. dok says:

    Wow, after reading around on his site i realized that i only live 2hrs away. I live in Hoover, Al. I might just have to give him a call, make him update his site, then check out his work.

  2. dok says:

    Oh yeah, anybody know whats being watercooled? i notied the hose but cant figure out where its going.

  3. austin y. says:

    I was surprised when i read it too, because I live right in the middle of madison, AL! I’m definitely going to keep an eye out for this car.

  4. Alex W says:

    Very cool… Porsche has a c :)

  5. pragma says:

    Is using 16 individual chargers, one per battery, really going to extend his battery life by that much? Seems like overkill to me. Maybe he’s trying to maximize the range for this design (30+ miles according to site)?

  6. Computer_kid says:

    Seeing all of these electric vehicles is inspiring me to do one my self.

  7. Justa Noob says:

    OK, Will, please clarify the TLA “AVR”. What’s the difference between “Voltage Regulator” and “Automatic Voltage Regulator”? I’m gonna guess that it’s the aspect of managing that battery (group) of batteries, right?

    BTW, I for one would like to see where Gary stashed the rest of the batteries, aside from the three that are visible in his under-hood photo.

  8. Madouc says:

    AVR is a type of microcontroller from Atmel. It doesn’t stand for ‘automatic voltage regulator’

  9. Gary Dion says:

    Hi all! Thanks for the interest in the project! I was unaware I’d made it into Hack a Day. Sweet! Now it explains the spike in e-mail I’ve received lately! ;) I normally check this site religiously, but have been super busy lately, so I missed it. I’ve been remiss in responding to e-mail (sorry) – I’ll do better. I have been planing an update to my site and now that I see people actually look at it, I’ll make it a priority! Though, I do have some bad news… I no longer have the EV, so don’t look for me on the streets of Madison. I’d like to build another, time permitting.

  10. Philip Baus says:

    Is there any chance you have more information on the charger on the web? (diagrams bill of materials, instructions)? I am currently rebuilding a older EV and the K&W charger is the weak link. This really looks good. Thanks

  11. phorce1 says:

    Does anyone have this mirrored? Building an uber UPS and interested in this design. The built in 120V charger on the UPS is designed to top off 10 series connected 12V 5aH batteries so I suspect it will have a problem when I attach 100aH batteries.

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