Hi,
Maybe introduce yourself, and atleast, take the decency to write something yourself instead of simply copy pasting from chatgpt.
Just a small note here, the total energy is incorrect.
Let me show you the numbers:
14x3,6x58.5 = 3kWh, not 3.5-3.6.
This might be interesting for you;
That is also a bs AI requirement
I would recommend you, like others:
State your location and just say which Capacity, Voltage and Peak current the pack should have. You can give a maximum size l-w-h and weight maybe. Maybe even specify your favorite cell. Let the one building it (the “pro”) come up with a recommendation on layout, busbar, …
Take their offer an paste it into AI to verify if you want
If you want to actually gain the knowledge yourself, I am happy to share my video on the topic:
I arrive at even lower energy
Assume 2kW discharge at nominal voltage 3.6V/cell, 14S = 50.4V, so 40A
At 13P that means 3A / cell
Discharge curve at 5A (closest value) reads about 4200mAh usable
4200mAh * 13 P * 14S * 3.6V = 2750Wh
4200mAh * 13 P * 14S * 3.7V = 2830Wh
thank you Roger, I am in Italy (Pollenza MC)
thank you Roger, I am in Italy (Pollenza MC)
thank you for the correction. sorry for my ignorance but is for that I am looking for help. Samsung 50S cells do not last so much. after not so many charge\discharge it loose power
They will be fine. Best practise is to run cells between 4.15v and 3v, that will give you the longest cycle life.
thank you. are you able to do it? that was a suggestion to prevent excessive producing heat.
Sorry, chiming in here cause i got a “ping” since my link got mentioned:). I do not know where you got your info about cells. I have used 50s cells in a Vesc Onewheel build for over 3000km under very harsh conditions, cells still charged and balanced nicely at 4.17v. And this was “only” a 2p pack…for the amount of parallel we use in efoil these cells will not suffer at all.
P45b is mucho overkill…
what do you mean with overkill? many efoiler said that samsung 50s last just a litle. molicell are more durable and prevent overheating better
I prefer the best cells
Ok…then in that case p50b (more range) or Reliance RS60 (even more range and discharge rate to power a supercar). Why settle for p45b, that’s weird.
Most efoil packs (production models) have inferior cells with lower discharge rate compared to 50s. I can say i have quite extensive experience with them on Onewheel, charging and discharging them to the max, monitoring their behavior using a high-end bms, and in use conditions where temps got high enough to overheat my vesc and motor, and temps below to -10C.
Hence i opted for them for the efoil, too bad i aborted that project…
I have used P42A, P45B and Samsung 40T for eFoil, P45B and P50B for Onewheels. Molicel are realy good, my P45B packs are 3Y old and still balace to 1 digit mV in a 7S11P config.
I also use RS50 for an assist in 12S2P and 12S3P config, they perform well for packs with low P, also great for Onwheels, probably overkill for an eFoil with a larger pack. You don’t need that high discharge per cell. Low resistance is still nice, you won’t get much voltage sag on high currents. Don’t now about long term behavior of the RS50, so far they still balance nicely but they only have about 10 charge cycles.
very good description. are you able to make it?
Hmm, are you sure 14S13P really fits ?
My design based on ludwig_bre inspiration below - it is 12S11P (originally wanted 14S9P, but found it hard to fit under my board and 3D printer contrains)
This design is 340x290 (plus handle) and it feels tight.
thank you. very good. what material have you used for the case?
who make it the case?
my internal space are a little bit different. 355x305x80
Hi,
I have prototype printed - but this picture show my intended final version.
Wonderful. can you do it one for me?
mm. 350 x 305x80. ???
