Recent content by jdh2550

For us lazy and/or soldering iron challenged folks :) when do you think you'll begin offering assembled systems for use with other battery packs? (If I read the thread right you're going to wait until you go to surface mount before offering the assembled systems)? The board looks great and...

Drunkskunk - Thanks for the Tesla lesson. Well written and good insight. I really enjoyed reading this and learned a bit more about the infamous converted Pierce Arrow.

This is another place to start (not saying it's the only source one should trust - just a starting place): http://en.wikipedia.org/wiki/Tesla_electric_car

Err, :? , your post mostly confuses me. Are you saying it's easy to solder? That might be the case for you, but not I. Second up, your talk about $500 for artwork doesn't seem to jive with the fact that Jeff can get boards for $2 a pop now. Isn't the artwork required for producing the board...

Yep, reports of Tesla driving such a car have been pretty much proved to be BS (that's not a historically correct term - but you get the idea). I think there's a discussion of the lack of validity of the claim on wikipedia - but I was too bone idle to look it up.

I presume that's the price for the unpopulated board? How much for a populated "turn-key" solution? (I can't solder surface mount components for sh!t). Thanks.

Of course, I have to disagree with this ;-) Motor scooter sized EVs are practical today. While the batteries supplied are marginal that's usually because of cost considerations rather than battery capability. A good set of U1 sized SLA's with battery balancers will give a scooter a...

My XM-2000, the controller has a cut off at 50A and is a 60V system = 3kW. The newer Z-20 has a claimed 90A cut off so that will be up to 4.5kW.

I believe GM have a deal with A123 for batteries for the Volt. I expect them to bring it to market - as it seems that they need to fill a hole in their marketing strategy. They certainly aren't doing it because they give a damn about the environment or anything else. If BEVs are to make...

Sounds like high current draw is an issue - so not much use for EVs: BetBatt, Inc is the licensee of this technology.

Can anyone point me at a discharge curve for 50A (approx 20C)? I looked through rmitchell's RC forum references but the max I found was a 30A (about 13C). Thanks.

Good question: As far as I know the important aspects of the charging cycle are: 1) Voltage profile required by the chemistry (x amount of time at y voltage for chemistry z) 2) Internal resistance of battery pack - which determines the maximum safe charging current for a given chemistry (heat...

Wow, things certainly took off like a rocket around here. Some observations: Although the "boffin" (William Tahil) quoted by safe has an impressive title he's not very current with Lithium (anyone who still quotes "the attendant safety issues of Lithium" isn't talking about the LiFePO4...

Toorbough ULL-Zeveigh - WOW! Thanks for your detailed post. I learned much about both NiMH and the Chevron/ECD Ovonics relationship. Some questions for you: (1) Where's a good source for me to read up on more of what you've written about? (I thought I was fairly well up to speed on it - but I...

To clarify my quote - I mean with regards to Peukert effect. Whereas So, OneEye, you're saying that my assumption is incorrect? I.e. adding packs in parallel reduces the effective discharge rate, which in turn negates the high draw issues? I thought that basically in a parallel circuit the...