This is my custom “hollow-core”/integrated deck. Made with a combination of fiberglass, maple hardwood, and baltic birch. The deck literally made from another board from Five Mile called the warhorse.
It has a skeleton design it has room for a 12s3p 18650 lithium pack and duel focboxes. It also has an integrated voltage meter, charging port, anti-spark connector for power, and phase leads.
Lots of love went into the deck and I loved how it turned out.
I honestly love the board so much that I don’t want to ride it. It belongs on a wall tbh. However it would be a disgrace if I didn’t use it for the whole reason I made it.
Build should be done really soon cause I randomly got 2 days off. Teachers are walking out Thursday and Friday cause of #RedForEd here in Phoenix. Just waiting for the silicone to dry
Spec wise it is:
12s3p with LG HG2s. Spot welded with the “boss” welder
Focbox
Bestech bms
@marcmt88 awesome mount
Single SK3 6374 149KV
36 and 16 teeth pullies
Also custom slide glove remote I made. More on that later.
Probably alot easier to understand what’s going on in the diagram than in the pictures. Anyways channeling the wires is taking some time. About half way done now.
So all the bms wires are channeled and I was just hooking up the B- and P- to the battery. B- to the negative of the battery and P- to the positive. However when I went to solder the P- I got a huge spark melting the end of my wire. Obviously I shorted the battery
This is my first time bypassing a bms so I must have hooked it up wrong. I don’t see how though. @thisguyhere this is the bms you sell. Can you maybe take a look? Thanks
This is the bms’s diagram
And this is my diagram of exactly how I hooked it up.
Yep I think I killed the bms. @thisguyhere thanks for the diagram totally my mistake. It seemed to be working up until I solder all the bms leads on. I checked each voltage and they were correctly connected however this spot on the bms got hot and stays hot.
Everywhere else is room temperature so I must have broken something there.
I also did plug in the charger for around 2 hrs to see if it would balance the cells and it didn’t seem to do anything. For now I will just balance them with my imax. Will have to find another bms.
For now I guess I will just have to balance charge with my imax and buy a new bms
The reason the bms shorted is because you connected the positive of the battery to the p- (bms output negative or power negative) this is basically a straight short and your lucky the bms has a short circuit protection otherwise the battery would be cooked to. When wiring the battery positive goes straight to the load.
Couldnt help myself and took my first official ride today! Yesterday got my bushings and the motor mount solid. Had to buy entirely new bolts for it. The ones that came with it stripped too easily. I am using 94 green and 90 red venom barrels stacked together. Totally stable as long as weight is above front truck.
Charged the cells up to 49 volts and did a speed test. It was breaking 30 mph no problem. However my speedometer app said I broke 40…
I honestly don’t believe that though. I definitely felt faster than 30 but I don’t even think 40 is possible at 12s and 149kv especially in a 3p configuration. I would expect there to be too much voltage sag. Also I had the vesc limited to use only 40 amps. I will have to give it another test some other time.
Also the deck was totally solid at these speeds. It has no flex! Feels and looks just like a normal deck. And because the weight it in the center of the board it’s short take is actually functional
Forgot to explain my anti spark connector. There is a sanded down xt90s inside the deck and was put in while I was making it along with the charging port. All you do is simply plug the other end in and it is fused!
Yeah definitely want to get a new one even if you think that it could be fine. Not worth the risk. I went through three batteries due to a shorted drain resistor, after I thought mine was fine after a misplaced balance lead. Got a new one off ebay and it fixed the problem. $100 mistake there…
