And here’s my latest YouTube progress video…

Progress #2 - Strip Down and Weigh-in

Hi all, I guess it’s time for an update…

So, I’ve been busy since my last post, but probably not a lot to show for it.

First up was to collect my motor and inverter from Helix. They’d had the pair on a dyno for a week or so doing the characterisation. All seems to be good, though I am waiting for ...

Ok… so that embed worked for me. Please let me know if you can/can’t see that and I’ll try some other way if others can’t see it.

[EDIT: Maybe that didn't work so well. Here's a YT link...]



J

And here’s link to a quick video of the 6:1 epicyclic reduction I designed to fit on the Swindon Powertrain motor. I appreciate it would scream like a banshee with those straight cut gears, but it was proof on concept to see how all the tolerances would play together and whether I could then get ...

Here’s a link to me holding a print of the motor (first image) and then me offering it up into the project car chassis (second image). I printed the stator with an array of holes so I could see it fouling any chassis as I offered it in… https://purplemeanie.co.uk/wp-content/uploads/2025/02/IMG_4751 ...

Cool… thanks for your thoughts. Much appreciated…

To answer one of your previous questions first “how far are you down your route”… answer: a very long way :-) I have most of the major components in hand and will take deliver of the motor in a few days.

To your specific points…


Oh yes, KISS ...

Hi SuperV8,


Interesting project. What transmission/gear reduction would you use with the Helix motor? Would that also fit in the transmission tunnel?


So... I'm all about "don't get it right, get it running"... and in that vein phase-1 will be as simple as possible. And one of the ...

Ok, thanks Johannes. I like to understand the protocols I’m working with on a project and so I’ll probably keep doing a bit of research on charging, but appreciate that might be a bit of a luxury.

Lots to think about there on where it will make sense to inject the CCS.

Thanks again, J

Since only a maximum of 22kW is required for AC charging, the DC2DC converter is far from its maximum. The description states ”
Voltage range for full performance highside 450-850 V”, from which I conclude that lower voltages also work, only with limited power. You probably wouldn't even need to ...

The DC2DC converter doesn’t run by multiples. It is configured to run in one a few modes…. High-side constant voltage, low-side constant voltage, constant current etc. Then you tell it the relevant target parameters.

Thanks for your thoughts on FOCCCI, I’ve maintained open source forks before and ...

Can this DC2DC converter also be used as an OBC, perhaps with an additional rectifier? Then the additional weight for the charger can be saved


Hmm. My assumption to date has been no. But you raise an interesting point about using a rectifier. I don’t think there’s a configuration of the ...

Awesome! I think I have seen these videos before, was even recently wondering how it was going. Glad to see you're still at it.


Thanks for watching. Though I’m about 2 years behind on updates. I’m trying to get up to date now and should have videos coming out every few weeks (though I’ve said ...

Welcome, very cool project.

Are you planning on building or buying the 200kw bidirectional DC-DC converter? That's a serious chunk of hardware.

For the size considerations you could cobble up 4x Hyundai HSG (hybrid starter generators, one at each wheel / CV and use everything in the middle for ...

Great video, I've have for many years been thinking of converting my 7, but I think I would miss the power & sound of a super charged 4.8L V8 in a 750kg car :) it at least I converted my Jeep to EV :)


There are a few of us converting Sevens at the moment. It’s tricky to get a solution that ...

Hi Snelly, Yep, That's exactly what happened, see:



(The renders in that video a very old now)

J

... oh and another factor is flexibility.

The DC2DC converter gives me options to switch battery configurations around without having to nail an exact pack output voltage. If I can come up with a battery pack that will fit at say 300V or 500V etc, then the DC2DC lets me do that.

I agree that's a ...

Bratitude and Johu,
Thanks for the comments.

Yes, absolutely agree with your concerns.

But as you both are probably well aware, the n-dimensional problem to be solved is tricky, and it led me down this path. I couldn't find a motor that would fit, other than to buy new. Tesla (not a hope of ...

Hi all… first post… and as is customary, here’s my project…

https://purplemeanie.co.uk/wp-content/uploads/2022/12/IMG_3171-scaled.jpeg

So, I’ve been working on my project for about 3 years, and thinking about it for much longer.

I’m converting a 2012 Caterham Seven to be an EV.

The project ...