Boosted actually did this for their earlier boards. Nothing wrong with it.
1 Like
Great. I’ll try to find some current ratings to determine the width needed.
Wow so happy how is everything coming along.
I strongly considered this. Not routed into the deck, just layed under the grip tape.
The main reason i went with silicone wire is cus copper braid uses much thicker individual strands, and so lots of flexing/vibration over time can cause it to snap. I dont know how much of a problem that would actually be, but it’s worth considering.
12AWG is really not that thick. Not noticable at all under the foam and grip tape for me. 14AWG might even be enough if you’re going 4WD.
1 Like
You were using 12awg?
1 Like
Currently using 12AWG under my grip tape, yes.
2 Likes
Hahaha best reply of the week for sure 
7 Likes
If you need a 3 wire channel made up, I can do that.
I think" everything in my shop is something I have made to use personally.
So never considered a 3 wire concave loom.
4 Likes
Are these designed to fit the standard width deck or the bigboi?
Neither of them but you can chop down existing decks a bit to make them fit.
1 Like
so there is a specific deck needed to use them?
They will fit our future deck line and can also be fitted to existing decks with minor efforts.
15 Likes
For a big pack with a high P count you will stay well within a region that is acceptable for the cell.
Off-Road boards usually do not go fast in average and there for the amp drain is not as high as many people think. A10P pack can deliver 70-100A continuos with such a cell. In reality you will never see 70A continuos form your battery.
If you have fixed budget for the battery and you want a lot of range, you can go higher in P count and get what you are looking for. Cell prices for higher drain cells can be twice as high as for lower drain cells. So far the same money you can build a bigger pack and reduce the strain from each cell.
At the moment some cells are also hard to buy and that also plays a role.
Some riders also ride on flat terrain and others ride in hilly areas. Some riders are 70KG other 100Kg.
Conclusion: You can not simply judge a cell without knowing the pack size and terrain and rider weight + average speed.
1 Like
While you are completely right about the intended mountainboard use of the board and battery box, i want to say that my board on street is capped at 110 battery amps total and i can really feel when i hit that duty cycle limit where motors start to throttle.
With 12s4p P42A cells at room temperature, they sag down to around 26% on the wand so i assume around 3.3V/cell at 27A load each. Mooch test says 3.55v at 30A so everything else is cable losses and/or measuring errors
If i were to use the battery box with 48G cells in 12s7p i would actually get a similar or worse sag trying to pull over 100 battery amps from it even though it has 3 more cells in parallel. Add the fact that i’m draining 16A from roughly 8A rated cells and things don’t look nice anymore.
Battery box and pcb look nice, p42a’s fit with a bit of sanding, everything is cool, it’s just that some around here guzzle electrons like a hellcat does petrol on a german highway. They WILL take offense if they are told a fiat micra engine is all they ever need
8 Likes
The Samsung 48G you recommend though is typically more expensive than the much better performing 21700 cells. The 48G is also much harder to find.
By using a better performing cell you can save money and possibly have a smaller pack (fewer cells in parallel) too.
I disagree, relative cell performance is independent of those things.
How the Samsung 48G performs compared to another cell like the Samsung 50G or Molicel P42A (if it fits) doesn’t depend on pack size, terrain, rider weight, average speed, etc.
The performance of any particular pack when riding, of course, depends on all those things and more. We can’t even begin to estimate how a pack will perform without knowing a lot about how the pack will be used.
But we can certainly judge (via testing) how a cell performs, and compares to other cells, without knowing any of those things.
Respectfully, with the Samsung 48G performing worse than most other high and ultra-high capacity 21700’s, being harder to find, and typically costing the same or more than the best performing 21700’s I feel it becomes difficult to build a case for its use.
27 Likes
If someone takes offence from a sentence like " dare a look at a certain cell", I feel very sorry for that person. Posting toxic comments also doesn’t help… coming up with a viable technical argument does help.
1 Like
Cant let it lie can you? I already provided you with a technician answer but here it is again with pretty pictures and telemetry.
In this post is a telemetry log of a ride I did late last year, switch it to satellite. Entirely off road.
Now lets only concentrate on the battery current, as you can see multiple times the battery current is higher than the maximum current your 12S7P 48G pack could supply. As @Battery_Mooch says, those cells are good for max 5-7A per cell, so circa 35A total current output. My board is set for 80A per side battery max and is geared for ~30mph max speed, so potentially on bad terrain at 50% duty cycle my battery can be approximately 90A total output current and just 15 mph - this is already almost 3x the power output that your 48G pack can provide. If you gear shorter, the situation gets even worse.
Your 48G pack will be severely power limited, we all know how motor amps work against battery amps, I’m not disputing it will still have torque off the line, but as you accelerate on bad terrain the battery will sag, the internal resistance will climb, it will get hot, it will be an awful experience to ride and the cells will suffer a short life. Can you honestly hand on heart say you have tested this before recommending, because I don’t think you have - and that’s my issue. I know you have never been wrong in your entire life, but I’m sure you can see why I think you do this community a disservice with shitty advice.
13 Likes
With regards to battery amps here’s my log from riding that location.
Consider that this is on a board with a 18s4p pack. The point of interest is this:
So over 9 miles and an hour long ride I drew peak power of up to 16A per cell. But more interesting is that the average current is 4.3A per cell for an hour.
Curious as to @Battery_Mooch and @Trampa opinions on how 48G would cope delivering over 4A continuous for over an hour with peaks up to 16A?
Im guessing they would be a saggy mess and I would have spent an hour sitting on the battery voltage limit. I can verify that the P42A would give no fucks.
6 Likes
Out of curiosity. I see your average Wh/km was 52.3
What tyres and gearing were u using?
1 Like