Go back and reread my post. I wasnât making an argument for or against either nominal or maximum battery ratings.
But since you asked. Nominal ratings are used for consumer products. Which is why they are used everywhere. Most people who use batteries are consumers.
Maximum ratings are used by engineers designing devices that use batteries. They make sure the device taking the battery can handle the voltage ranges that a nominally rated battery is capable of delivering (ie the maximum rated value)
Ebikes, power tools, adult vibrators all are consumer products and nominal voltage applies because an engineer already took into consideration the maximum rating.
Esk8 uses maximum voltage because for the most part we are the engineers. We are designing this shit ourselves and configuring the electronics to handle the voltages and currents we want to throw at it. So maximum voltage applies.
And as a side note, these arenât my opinions, this is how industry actually works.
But all I really wanted to say was using the ânormâ as an argument is not valid
Thatâs sounds like shit you pulled out of your ass. As engineers we should be able to handle a small calculation.
Also most of us are more consumers than engineers. We donât really Design anything. We just assemble stuff Thatâs already designed for us.
That is very optimistic. Engineers would know the difference between nominal and full charge voltage. If the argument was, hey most diy consumers are to stupid to know the difference so maybe you should point out itâs nominal (even though 12s6p layout is listed) , I can get behind that. Instead we are targeting/name calling @Simeon for no reason.
Actual engineers, yes. Which I happen actually be. Degreed and everything. With far too many years under my belt.
But in the case of esk8, I was being a bit loose on the interpretation to mean âthe crazy ass people building these boards designed to kill ourselves onâ. At the very least if they are building the batteries I hope they know the difference and can do the math. If they are setting up the controller, it would be nice if they knew the difference.
But I donât agree they should have to do the math just because they can. The diy esk8 âindustryâ talks in maximum rated voltages because of the aforementioned reasoning, so those are the numbers we want to see. Weâre too busy trying to come up with new ways to kill ourselves to even add 1+1.
But thanks for being civil and having an actual discussion
No matter what voltage we write on the battery we need additional knowledge anyway. 12s VESC are rated for 60V max. If we only go by max voltage you may get the idea that itâs fine for 14s because thatâs still under 60V
I donât believe there is an industry standard, companies seem to use whatever the hell they want.
Take power tools for example. Dewalt 20v batteries are 5s 18650 li-ion cells. They are using 4v per cell. Not nominal. Not max. Just an arbitrary round number. Even the fine print under the battery says â20v (Max) 5Ah 100whâ. I believe they did it to differentiate from their 18v NiCad line, but still⌠itâs confusing.
Once sales and marketing get involved all logic gets thrown out the window
Engineer: âWeâve designed this system to run at 18V using X model batteries available at such and such source.â
Project Manager: âHow are the safety aspects?â
Engineer: âWeâre using components that allow the system to safely handle up to 20Vsâ
Hey, canât you guys debate something without it getting personal? That kind of silliness is the last bastion of the desperate and completely negates the legitimacy of anything you have to sayâŚsheesh.
The tech stuff you guys bring up is worth reading. Your personal crap wastes my time.
If any cell (or electrolyte) factory has enough vapor escaping that the atmosphere is explosive then they have some verrrry severe safety and/or QC issues to address!
This was at a project site in Denmark that had an experimental hydrogen electric generator- hence the spicy air warnings. Not my every day, was just on-site to survey & spec the project.
