[KryptKanix]

Always wanted to build a electric car since my college days but didn't have the income/time. Well I picked up this 85 Porsche 944 for cheap, and thought I would start my journey here.

So far I got it completely gutted, and a blank canvas to work.

I have 16 battery packs made up from anr26650(3.3v 2500mAh, cells in 12s8p) I also have a 10" forklift motor that I got for almost nothing.

Now I want to think about what controller to use. I wanted to try my hand at making a open revolt controller, but abit conflicted because of the 144v cutoff for the battery pack. It is by no means a car for the highway, but would like to hit 120kmph reliably. Open to suggestions and more information.

 

[MattsAwesomeStuff]

The Open Revolt motor (though open source) is more or less a dead project. It became the P&S (Paul & Sabrina) controller. Paul hasn't been around in years and IIRC wasn't interested in doing more EV stuff. And, I don't even know if the most recent version works, or if there's corrections on it no one documented. I gave the last thing I had from Paul to Remy, and I think it was accurate then? Remy was going to post it somewhere I think.

I dare say the new DC forklift soon-to-be meta on a proven controller is instead to use a Prius Gen 2 controller ($50-150 at a junkyard), and then build a DC board to swap out the controller board for it, as designed by Damien of EVBMW.com.

Problem is... he designed and built it, but only ever published the schematic I think. It was just a quick "Hey I bet this'd work", and it did. He built a board and used it, but he's got a million projects on the go and didn't get around to finishing it or putting it up for sale. And then EV8 went and took that schematic and made a circuit and got a disgusting amount of power out of a DC build in his RX8 (so, second person confirmed that the circuit works fine). So, I pestered EV8 to post his circuit. And he said he couldn't. And I said "Well whatever you used to make it, whatever that document was, could you share it?" and he said no... because he didn't put it into a document. He just built the whole circuit in his head.

... so me and some others pestered him and he said okay, when he has time in the new year, he'll put some time into formalizing the circuit and sharing it. It's low on his priority list, because he's a speed demon and already is mid-upgrade moving to an AC build.

It's now the new year, so, I'll go bug him again.

In any case, him or someone else I'm sure will get around to posting some usable circuit for it. I think it's reasonably safe to plan your build around it.

 

[KryptKanix]

The Open Revolt motor (though open source) is more or less a dead project. It became the P&S (Paul & Sabrina) controller. Paul hasn't been around in years and IIRC wasn't interested in doing more EV stuff. And, I don't even know if the most recent version works, or if there's corrections on it no one documented. I gave the last thing I had from Paul to Remy, and I think it was accurate then? Remy was going to post it somewhere I think.

I dare say the new DC forklift soon-to-be meta on a proven controller is instead to use a Prius Gen 2 controller ($50-150 at a junkyard), and then build a DC board to swap out the controller board for it, as designed by Damien of EVBMW.com.

Problem is... he designed and built it, but only ever published the schematic I think. It was just a quick "Hey I bet this'd work", and it did. He built a board and used it, but he's got a million projects on the go and didn't get around to finishing it or putting it up for sale. And then EV8 went and took that schematic and made a circuit and got a disgusting amount of power out of a DC build in his RX8 (so, second person confirmed that the circuit works fine). So, I pestered EV8 to post his circuit. And he said he couldn't. And I said "Well whatever you used to make it, whatever that document was, could you share it?" and he said no... because he didn't put it into a document. He just built the whole circuit in his head.

... so me and some others pestered him and he said okay, when he has time in the new year, he'll put some time into formalizing the circuit and sharing it. It's low on his priority list, because he's a speed demon and already is mid-upgrade moving to an AC build.

It's now the new year, so, I'll go bug him again.

In any case, him or someone else I'm sure will get around to posting some usable circuit for it. I think it's reasonably safe to plan your build around it.

Yes I've actually read up on that prius gen 2 controller. He had it running something like 200v 1000amps. I was interested, but didn't see anything solid to follow along with. Any other options available?

 

[ishiwgao]

I have 16 battery packs made up from anr26650(3.3v 2500mAh, cells in 12s8p)

Quick question, where did you get your battery packs from anr26650? did you buy the batteries from somewhere and made it yourself, or did you buy the pack/modules from some other place?

 

[KryptKanix]

Quick question, where did you get your battery packs from anr26650? did you buy the batteries from somewhere and made it yourself, or did you buy the pack/modules from some other place?

I got them locally, I live near Toronto Canada. They came from a electric bus. I did have to remove them from the casing to check them, and also remove the bms because I couldn't make use of them.

 

[onegreenev]

This is a viable option if you have time to mess around. He is still improving the design and can be used for any induction motor and more. Build a power section to allow pretty high amperage and combine the brains from this project and you have a running vehicle. This way you can make a high voltage high amperage inverter. Or keep it mild. They have drop in replacements for Tesla units too and for the Leaf. Check it out. Can't hurt. Home - openinverter.org - Open Source AC motor inverter

 

[lordmundi]

Always wanted to build a electric car since my college days but didn't have the income/time. Well I picked up this 85 Porsche 944 for cheap, and thought I would start my journey here.

I'm really interested in following your progress. My son and I have just started a conversion on a 1987 Porsche 924S which is very similar to yours. I would love to be able to throw ideas around with you to see how you are solving various problems and what products you decide to use!

Best of luck!