Little FOCer! 84V 5kW VESC-Based Controller

I know your concern. I’ve been doing what I can in the design to lower cost but there’s only so much I can do. The cost of materials and production services are going up and that forces the price tag up.

This is why I’m resurrecting the Cheap FOCer. I want to offer it as a way to get decent performance without breaking the bank.

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But this is just valid for the ones who want to start with a new entry level board as is just 12S capable. But for the ones who want to evolve their XRs to a better thing, a low voltage focer is not an option, which is a completely different niche. A HV VESC is a must.

So unless there would be a Cheap Focer HV with at least 75v -less doesn’t worth it, who wants to vescify a XR with the same or even less power than XR?-, ideally 84v, it will be useless for people interested in the Little Focer.

The cheap focer isn’t exclusively made for balance vehicles. If it’s 16s capable I want one for a small electric scooter rebuild

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Is 12S buddy. Some people used 13S but is at your own risk. 16S is already HV VESC, not capable for Cheap Focer.

???

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Oh, there is a new one with new specs. Fair enough. That’s better for sure.
But not for a XR convertion, sadly. To keep pretty much the same as XR offers already, doesn’t worth it.

Unfortunately vesc conversions aren’t cheap anyways. The damn badger battery enclosure is $350. This is awesome for floatwheels since 16s is plenty there.

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If you want good quality and capable of HV, then I can’t do cheap. I’m already going as cheap as I can with the Little FOCer. You can have cheap, HV, or good quality. Choose 2.

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Probably just making Little Focer v3 open source as cheap focer -in fact we wouldn’t want or need anything more-, would be enough to make the trick :wink: . Althought I am sure this is not gonna happen

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Yeah I can’t do that…yet. Myself and others are trying to make a living off of some of these designs I’m coming out with. The Cheap FOCer series is the open hardware project that I’m giving to the world right now. I know it’s not quite the HV capability you want but it’s better than most. Now maybe (and I truly mean maybe) the CFOC can evolve into 18S capability but that’s not yet up for discussion.

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Whats the size of the battery/phase/connectors from the factory. If I was considering one for a bike, could the stock wiring support 250 phase amps/100 battery amps for any period of time?

12 gauge silicone wire I believe. I put an xt90s and 5.5mm bullets on mine. The bullets are probably overkill but I do 100 battery amps and 250 phase all day with no warm wires or connectors.

Wow that’s surprising. I suppose since it’s not continuous it’s fine, but I’m surprised it’s not getting warm.

Not that I remember. I’ll have to check again and see.

@shaman question, any reason for not adding bolt-on main terminals to the little focer? It would be better for organizing the cable management to make it custom based on the space you have. Also the durability could get improved if you have a way to change the cables if get damaged…
Maybe there is a reason which I am not aware of.

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@shaman I’m using the tronic 250 in a build, and I was wondering what type of JST connectors you used on the board, and the gauge of the wire going to the battery and motor - I’m just planning out what I’m going to do before buying stuff ya know

Plus the battery connector type that is sold on the tronic 250 on the tronicsystems website

If you’re buying the tronic it’s 10awg on phase and battery. and qs8 on the battery connector.

5.5 on the motor side

thx - what type of jst connectors are on the actual board?