Foil assist battery for beginner

Build, Repair & Mod
1

Hello everyone,

That’s my first post and I know I’m tackling a question that is already ubiquitous. However I didn’t find any beginner-friendly solution for the moment.

As I want to create a diy foil assist on my surf foil setup to pump on flat water, Im struggling to find a solution for the battery.

I would like to use a flipsky brushless 6384 and a waterproof esc (Flipsky IP68 Waterproof ESC Electronic Speed Controller Mini FSESC6.8 – FLIPSKY). (I have a fone phantom 1250 and a 35L surf foil board)

Unfortunately, I don’t have the time to learn to build a li ion battery, but it seems to be way more secure than a lipo option.
Thus, can somebody help me to find a beginner friendly solution for the battery ? (Adapt an ebike battery? Use a foil drive battery? Find a specific website to buy a battery? Use a takuma second hand battery ?)

2

Use something like these?
https://iflight-rc.eu/de-de/products/fullsend-6s-4000mah-li-ion-battery?variant=44043325178121

1 Like
3

You may need to add where you live. That would affect options that might make sense and invite a response from someone in that region. Europe? USA? Australia?

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4

Hello thanks for your advice, I live in the South of France

5

Thanks for the answer,
Interesting but it seems that I would need at least 40V and 100A continuous.
Am I right?

6

The packs in the link use EVE INR21700-40PL cells.
Take 4 packs, to get 12s2p.

That is a known working solution.

There is no reason why you would need 100A continuously.

2 Likes
7

I’m 90kg, maybe it influences the current needed. According to my research, average power is not huge (around 2–3 kW), but take-off and recovery phases regularly require 4 kW or more.
At 12s (~44 V) this translates to:
3 kW → ~68 A
4 kW → ~90 A
Also, I’m planning to use it on flat water.

Do you think your option is sufficient ?

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And what do you think about 25ah battery from Takuma?

Thanks!

8

Im 95kg. First I had 12s2p and the battery was empty super fast and i supposedly had a supposedly voltage sag. I now have 12s4p and it’s so much better! I’m often on a river and drive around for a bit.
You could get 8 of those fullsend and make 12s 4p.
I don’t know who, but somebody told be the Takuma batteries like burning (I hope I’m wrong here)

9

try this site in germany , lots of options (good service i bought mine there)
E-Bike & Scooter Akkus online kaufen | Ihr Akku-Experte akkushop24 fü

10

Not sure where you get your numbers.
I am 84kg and need 2.2kW to get on foil and about half of that once up.

I use the same cells in my batteries.
On spec they should provide 60A, so 120A for a 2P setup. But I would not expect that for long

If you want to pump your setup, you probably do not want something more heavy than that.

11

Bicycle Motor Works in the US sells some quality high-power packs that would probably be great for this use case. Their 14s Ampace JP40 packs look like the best value for foiling; the 8ah version (14s2p) has 60a continuous and the 12ah (14s3p) has 80a continuous discharge. (https://www.bicyclemotorworks.com/product-page/52v-12ah-ampace-jp40-lithium-ion-e-bike-battery, https://www.bicyclemotorworks.com/product-page/52v-8ah-ampace-jp40-lithium-ion-e-bike-battery)

They have other options too (Molicel, Samsung); while pricey, they seem like excellent quality and a good option for an off-the-shelf pack.