[JRP3]

I did see the potential with the higher voltage, I was looking at it more from a cost/marketing aspect. 500A, low cost, is somewhat in contrast with 300V high cell count. Especially if you're one of those who thinks they need a BMS If you run more, smaller cells, you might.

Originally Posted by electrabishi

While I agree that 500 amps may be on the low side for anything other than a put put at 156V

I resemble that remark, as I drive away in my 120 volt 550 Amp Fiero AC though!

[electrabishi]

Originally Posted by JRP3

I resemble that remark, as I drive away in my 120 volt 550 Amp Fiero AC though!

I know how it is too. There was a period I was running 120V of GC2's in the truck. The batteries themselves were barely good for 400 amps, and i even ran them at 350 amps. It was pretty much a put put

Mike

[electrabishi]

Originally Posted by electrabishi

I know how it is too. There was a period I was running 120V of GC2's in the truck. The batteries themselves were barely good for 400 amps, and i even ran them at 350 amps. It was pretty much a put put

Mike

Oh yeah but meant to say too, that knowing the truck could be more peppier with just a change in batteries helped me to remember that someday I'd drop a 200AH pack of lithium in there. Then it would be peppier than with the Deka's that would belt out 1000 amps

So just remember when planning a conversion, or asking a developer to build a new controller. Always ask for more that what you think you'll need. Because I know deep down inside everyone, no matter how fast your conversion is, there will always be a time when you want it to go "a little" faster I have never heard someone claim they wish their car were just a little slower

Mike

[JRP3]

I think our avatars say it all in respect to expected levels of performance

[electrabishi]

Originally Posted by JRP3

I think our avatars say it all in respect to expected levels of performance

Wow, I didn't think Fiero's had 6 wheels

Mike

[JRP3]

Maybe someday I can have all of them smoking

[piotrsko]

Originally Posted by JRP3

Maybe someday I can have all of them smoking

i'm guessing you mean a fire from applied rotational torque exceeding the frictional coefficient instead of just applying external heat.

[Qer]

Originally Posted by JRP3

That seems an odd target. The 500A rating is low, suggesting a low controller price

Not for a small car, a MC or for a bigger car if you don't care about being able to take off like an oiled lightning at the stop lights. That said it might be on the small side for a big pickup, quite true.

Originally Posted by electrabishi

While the cell count would be higher you could do with lower AH capacity. And with the higher pack voltage than what you put on the motor you should never run the controller at 100% duty cycle. Plus the lower amp draw is easier on the batteries for continued use (more so than with lead acid that exhibit Pukerts effect).

There's that, too. And of course, a 300 Volt pack could easily provide suitable anode voltages for a class A valve amp with suitable output power for a car stereo, making it possible to finally have GOOD sound quality in a car!

[Tesseract]

Originally Posted by electrabishi

Nope. They are different ones. The ones Otmar is advertising are ones he had built prior to starting in with EVC. They still have the Cafe Electric Logo on them. And if I am not wrong the number of them is >10.

Mike

Hmmm... if the market is honestly 10 or more a year then this is not nearly as Quixotic a product for us to develop.

Originally Posted by JRP3

And why are you building a larger version of the Soliton when I'm still waiting for my 3 phase AC controller I know you could sell more than 4 of those a year

The hardware design for the AC controller is actually easier than it is for the DC... the software, however, is - no exaggerating - at least an order or magnitude more difficult.

In fact, it is a monumental enough task for Qer that we are seriously considering ponying up the $22k for the Mathworks simulation package to be able to develop the motor control part of the code with models, rather than laboriously convert the vector and torque control field equations into C code.

Not to distract (too much) from the subject at hand...

[electrabishi]

Originally Posted by Tesseract

Hmmm... if the market is honestly 10 or more a year then this is not nearly as Quixotic a product for us to develop.

I didn't mean to imply anything about the market. You'll have to do that yourself ;-) I think the market "could" be 10 or more a year though for any controller that will stand up to abuse and are produced and available for folks to buy. My experience with the 3 Zillas I've bought, while not painful like it is right now at this moment, was still pretty rough for me to wait. However I am glad I did because the product is solid. So if people will "wait" for a solid product, think how many will jump when one is readily available

Mike