Well, if I have overheating issues this is what I will run, used them is all sorts of vehicules since 2020. very good stuff.
One of the cells in the battery is dying of quick self discharge, hopefully in an uneventfull manner.
It is isolated in a safe spot with active balancing turned off.
There was not warning sign, that is quite strange. I had another week cell (n°7) but on a much lower scale.
Well that was a wasted 50€ of epoxy and few hours of work.
I checked options, stellantis 6s55ah modules look like an option, good price per kWh. (165€ plus tax per module)
Any other prebuilt automotive modules I should look into? Thanks for reccomendations !
After one week, the bad cell is fully discharged and dying.
Battery situation sorted out for this weekend with a few working batteries borrowed from work. It is also a good test of parallel use, as I have some new bms to test.
Each battery has a 60A cutout and 50A continuous, so I should not have bms cut outs with this setup.
Have to change lake, as the one where I made the first tests is not suited or allowed for towed sports and I got a few remarks after rising the boat two days in a row 
REsearch on wake shapers :
A quick and easy solution would be to have some sort of plate sandwiched with the motor mount on the transom.
A little underpowered playing in the strong river current, vesc is overheating, at the moment there is only a small fan, but nothing to extract the heat out.
The limit of this project is nice lakes or sea with low current close to where I live.
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Had a redemption session, with flat water, boat waves to hunt and in a ski zone 
Then went on a family adventure across the lake and back, around 6km.
The max continuous speed was around 8kph dur to the controller overheating and getting into thermal limitation. This is the next point of interest.
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Option for air cooling
Request for silixcon PPM compatible software ongoing. I’m almost sure the silixcon would run with no cooling due to higher efficiency and quality MOSfets.
I planned for a water line by static pressure but have nowhere free to mount water blocks.
Strip your vesc from the housing and put it directly to the big aluminium Plate while using good cooling paste. Maybe thats enough.
Yes, that would definitely help, but I fear that if I dont get the heat out of the plate, it will not work. Easy thing would be to replace all spacers by alu tubes , to transfer heat to the bottom plate that is exposed to the outside.
I can fit a small water block here with right exits/fittings :
Not sure how effective it would be.
Give the passive cooling a try, if it is not enough cooling put a cooling block directly to the alu plate and there on top the striped vesc. Like a sandwich.
ESC Cooling
https://a.aliexpress.com/_EIklJkw
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Nice sizes, thank you!
will order some just in case I need it. 
got the big one 123x56x7mmmm to fit below the esc instead of the stock housing.
Not convinced by the idea of breaking the waterproof nature of the engine cover for cooling. So water circulation or passive is the way.
The plate is some material. with a little bit of luck it works without water. On my small minn kota housing I didn’t had a chance for passive.
Will first remove stock heatsink and fix the controller to the alu plate directly 
Thinking about getting two of these to try wake surfing behind the boat :
Will need to sort out continuous power first.
If you ad 200kg into the boat power from the 65161 isn’t enough. You would need 15kw at least I think.
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The board get on plane with the 6hp, 2stroke, with :
-boat 70kg full
-me 70kg dressed
-wife 67kg dressed
-kid 16kg
-gear 5-10kg
So I think close to 160kgs of payload with 4.5kw should work.
But with extra 65kgs (total 220kg) it does not get on plane.
150kgs, plus me on tow, could work if the drive efficiency is good, or extra peak power at start 
Crossing fingers for you🤞🏻
Thinking about implementing this kind of extra safety, the system is not as safe as some lighter weigh boogie due to the size and weight of the craft, plus the stability that comes with the size…
Received the insta 360 X5 I ordered as a discount on ali, I will mount it on the boat.
First test of the cam, great quality, screen, huge step up since last time I owned a 360 cam.
Made a mount to install it on the boat, with a older high quality benro monopod. Two of those clamps will be installed on the battery box, and the monopod used as a stick will screw into the bottom clamp. Camera a and mandatory orange towing flag on top
Received cell holders and nickel if I get motivation to make a battery or samples of EVE 50PL or 58E to test
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