Hahaha. That was me. Yep. Still using it that way. Works good. Took all of 10 minutes to “fix”.
@MAC
This is weird! you have a drawing with 24mm dia con, your motor dia is 28mm, the drawing in their website shows 28mm and my motor is 24mm dia
Could the diameter depend on seal type used? 24 mm for lip seal and 28 mm for ceramic seal 
I asked my buddy to modify it for 27mm. will let you know
Finally the custom smart BMS is coming along. some of the features:
- Supports Li-Ion and LiFePO4 cells
- Supports up to 320Ah pack
- Up to 320 amps burst discharge ( timing depends on heatsink)
- Up to 320 amps continuous discharge (with proper Heatsink)
- 10 to 15 cells in series
- Up to 100 amps charge current
- Supports Standard CANopen fast smart chargers (delta-q ICL1200 and ICL1500)
- Supports non smart passive chargers
- Support Charge regulation based on the SOC (state of charge %) and Pack temperature for fast charge and pack longevity
- Accurate coulomb count Gas gauge with SOP, SOC,SOP, SOH,Cycle Counts and history of the pack.
- USB port for PC host application and firmware update and later host software
- Isolated CAN port with dedicated Wakeup signals
- ON/OFF Button
- Small OLED Display for main pack info
- Auxiliary isolated 5V 500ma output
- 2 Isolated emergency shutdown inputs (can be dedicated for kill switch, water leak sensor…)
- Auxiliary uart communication dedicated for Bluetooth or IoT gateway ,IoT gateway module is under development
Hardware Protections: - Fast configurable shortcut protection
- Fast configurable overload protection
- x2 configurable Battery pack temperature protections
- x1 configurable high current switches temperature protections
- Cells configurable under voltage protections
- Cells configurable Over Voltage Protections
- Inline last resort fuse protections
Firmware Protections:
- Pack discharge Over current protections
- Pack Charge Over current Protection
- Extra x2 High current fets temperature protections
- Extra x2 Battery pack temperature protections
Below is the short video in action while charging with icl15000 charger. I was only be able testing it up to 55 amps continuous in water thank. Hopefully next is to put my pack in and test in water
https://drive.google.com/file/d/1DqsEY6j_TyS62RU7q2K-frIm5cIt8gYl/view?usp=sharing
11 Likes
Wow, you are clearly enjoying the electrical side of an efoil build! 
Keep up the good work! I hope all this effort is not only for a one-off build?
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Nice. When will it be available?
Do you have a price ?
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I am still testing it. For low quantity around 100 units cost per unit is around $300 which doesn’t seem to be feasible for DIYers unless you want to have a high end bms for this price. I am also working to reduce the costs while working on the software and firmware features
2 Likes
You’ll break that mast so easily, i have the same gong mast and it’s not robust even before cutting.
It will be ugly when it breaks, please take my word and reinforce it before use!
Either a couple of layers of glass fibre or some bracing plates would do it, you’ll anyway cover it with your motor mount - it won’t be dragging or visible.
Even simpler would be to glue a solid metal brace into the unused mast channel.
Nike!
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I am looking at it now and I should say you are right. What if I enforce the motor holder clamp that covers the same section? I can do couple of layers of carbon fiber glassing on the 3d printed clamp that holds that section
thinking about it, and being lazy, i’d glue a piece of steel bar or alu as thick as possible in the unused channel (if you don’t need that for water cooling tube).
I find the gong mast on the thin/flexible side so you’d win some overall stiffness with that.
Holder clamp carbon overlay would work too but harder to know if it’s good since there’s a 3d print in there where the mast needs support
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came across this, looking for the perfect ip67 connectors between board and foil. Your connectors are stated for no more than 50 mating cycles. @samisin Did you have any problem with that ever since?
Where did you see this?
Its listed on the website specs
I’m super lost now. Which connector is it, and which website?
The amphenol connector being used is rated for 50 mating cycles at its stated ip rating according to its spec sheet on the amphenol website
Sorry, but I don’t see that on the website or the spec sheet. Please post a link or screenshot of this.
