The Saw | R-Spec Drive | 4WD | dual Unity | Haya | 12S4P | 97mm

That’s basically free

You could fill the hole with epoxy and sand it to get a frosted look that would diffuse the light

I was looking at the specs of the light bar, it is powered directly by the battery? That’s one road block I stumped on mine, using a 60 led/m strip I would need another DC/DC converter just for the leds

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Light bar used , directly battery powered, the foward voltage of the strip is 48V (measured with DMM) the lights become dim as hell when around 41-40V… but for the simplicity of the circuit, i did not care. I’ve also added a little 15ohm 4W ballast resistor for when the battery are fully charged (50.2V)

I was contemplating on reworking the LED strip in to a 24V operational voltage, normally it’s 8 LED in series, i would have changed it up to 4 // 4. But didn’t do that, just used as is.

now that I think about it… I should just of removed one LED out of the circuit, making the forward voltage 42V, that would have covered my entire voltage span with minimal dimming… oh well, already made 8 holes, not going back


Wait did you just say you did a group buy for these giant-ass pcb? :slight_smile:


Awesome work dude. So 2 BMS’s? one for each side?

Where can we get those PCBS… :wink:


I been using PCBway recently and i must say that i have been impressed with both quality and turn around time.

a few questions . . . what thickness copper did you go with for these boards?

have you used these cheep BMS before? are they any good?

in your system do the 2 sides run interdependent? is the main power from one half connected to the other?

2 oz copper, no i haven’t used this bms before, i am already a bit disappointed by it, it has no balance circuit… oh well it will be good for charging and cell monitoring

yes i was planning on paralleling up the two 12S2P packs, that way i can use only one charge port… but i could just has easily run them independently, but would require 2 charge ports.

What about one charge port but connected to each battery with a diode? This way they will still be isolated and no current will flow between them, using a 0.3v drop diode should be no problem

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i will be interested to see how this works out. I have a similar setup in my build where i have a 12s battery pack in an enclosure and i have 3 of them in parallel. in my last build i had to join all the balance points between all of the different packs and one big bms, but it means lots of cables between separate enclosures. I had been considering separate bms in each enclosure and just running power and charge to each enclosure but was concerned that something weird might happen.

im this close |------| to trying to make my own bms. but i already have so many projects on the go :frowning:

do it, make a de-featured version of the DiebieMS, no need for high discharge, cell balance + monitoring, CAN communication, LCD port, Unity switch control, charge control. would be dope.


yeah this is exactly what i was thinking.


Yeah that should work, only problem is it would charge the battery to around 49.9V

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Hey there, awesome build. I am wondering how much amperage you plan to put through the hubs?

This is the nomenclature i went for

Probably 60A motor and 30A batt

when do you think you will have it running? will you do any videos of it?

Go 16s pls if possible.

i should be done in a few weeks, still waiting for parts…

won’t be able to ride it until a few months



Led array, 5 leds all good, 1 led no good

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Hubz are in, #12 suiting up

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oooooh! the connectors, minimum wiring, repeatable setup is my kinda porn.


Testing the leds… fuck my retina. Technical note, these strips pull 200mA each @50V

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