For my tests I used a > 15 year old waterproof backbag and just inserted the motor wire through the main opening:
For the future I just bought the following:
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Looks great! I gave it a try today as well, but the temperature climbed pretty fast.
Do you ever run into overheating issues? Or do you mostly just use it to get up on the foil and then keep going by pumping?
Cable glands are useful to prevent water from entering into rigid volumes. Why wouldnât a modified vacuum bagging valve for molding composite do the same for cables going out of soft containers ?
Variant:
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If anyone knows how Duotone solves cooling with their new hip-bag assist, Iâd like to know as well
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I put my tow boogie 12s4p camdenboss into a decathlon 10L backpack to run as an assist, and it fit easily, and with the heatsink had no heat issues and was comfortable, it just lacks a waist strap.
Seeing this bag, I am tempted to try it, as I think it might be more comfortable to remove the box and have a flatter bag. I wonder if a solution could be to follow a similar approach to the box heatsink: to glue and clamp with screws a heat sink to the bag, with a metal plate on the inside. That gives a stable surface to attach ESC, and cable glands through the metal rather than plastic.
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Iâm waiting for the OverBoard Pro-Light bag to arrive, it should fit a 2x(6s2p) and the electronics from the camdenboss build
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to glue and clamp with screws a heat sink to the bag
I tested with Butyl tape yesterday and it seems like a perfect choice, often used in boating as a seal around trough-hole mounts.
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Interesting choice:
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I am using a 75100 vesc and have no heat problems. You may try to just add some cooling surface/mass.
Doing cable gland today. Biggest risk be aware of is mechanical forces on the thin fabric, especially over time (falling, cable grabbing something etc) since it has glued seams. I might reinforce seams on the outside. Also adding 50mm 3d printed washers around the cable. Duotone use a carbon fiber box for a good reason here. I think the thicker kayak bag pvc is stronger over time.
Interesting, I used the 75100 Pro VESC inside a box with an 8s5p Molicell battery. The box features a heatsink, and for initial testing, I placed the entire box in a backpack. It heated up quickly, so I need to do further testing with different propellers to see how it performs.
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The solution might be the bag fabrics pressed between the inner part of the vacuum plug and a cable gland outer part + o-ring seal on the outside.
May I ask where did you get the heatsink and what did you use to seal the whole thing?
Glued using marine silicone. Same washer on the inside, printed 2mm PC. Waterproof when tested with 10mm 3g2.5 cable.
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I wonder about filling the bag with silicon moulding compound to minimise movement, with space for each battery, and ESC and wires held in place with the mould. I suppose you will need some heat solution for any prolonged use.
Sorry, wrong information.
I use the following Makerbase VESC 84100 in the bag without additional cooling without any heat issues:
https://de.aliexpress.com/item/1005006515708671.html?spm=a2g0n.productlist.0.0.13c5c89efDd6cf&browser_id=59123ac3145b46a3a6576536c7bd9490&aff_trace_key=a9e3655457104dec8ebabb1104296d61-1748026177747-04576-UneMJZVf&aff_platform=msite&m_page_id=uxkigpqzocabnffp197635cf80e1f14c4ebb170a5a&gclid=&pdp_ext_f={"order"%3A"239"%2C"eval"%3A"1"}&pdp_npi=4%40dis!EUR!166.62!83.30!!!187.49!93.74!%40211b813b17497187266482637e9530!12000037495490277!sea!AT!736362968!X&algo_pvid=9cb78cb7-002c-4db7-8c57-8f2305c1b586&_universallink=1&m_page_id=uxkigpqzocabnffp197635cf80e1f14c4ebb170a5a
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Thereâs the issue. You need to run in a 12S3P config. Youâll get the same runtime with less heat.
I can run the 75100 with no added cooling in an efoil motor position for 40mins. I run a 12S 10Ah pack.
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I will likely design a 3d printed insert for the bag, printed in pc if everything else is a success after testing. Print Adds weight so will be small and only offer a minimal inner/outer shell for mechanical protection and stability.
Note that the overboard bag is IP66 (normally fresh water only) so not for submerged use. Iâm using individual plastic bags inside for both battery and ESC.
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Exactly, I never understood why foildrive advertises the lower voltage on their endurance battery as a advantage.