I haven't seen any science from BMS advocates yet. They make lots of assumptions based on nothing.
Besides I have a BMS I just don't have a cell level BMS. I haven't heard the theory on self discharge yet? Or the rate at which they discharge or an example of someone putting one on the shelf for 5 years then measuring the voltage and capacity. Save for Jack Richard who boldly did it and published a video. I read a lot of papers and I only found one that talks about self discharge although I don't agree with the way they use the term because what they really verify in the paper is capacity fade. Sent from my iPhone > On Jun 19, 2015, at 3:34 PM, Lee Hart via EV <[email protected]> wrote: > > Ben Goren via EV wrote: >>> I am curious as to how Paul came to his belief. >> >> His methodology is inadequate to the task -- rather like using a >> roadside truck scale to weigh the first four people to pass by and >> concluding that all humans weigh exactly 200 pounds. >> >> Lee, in comparison, is akin to a long-time general practice physician >> who's kept aggregate patient records of vital statistics for decades, >> and concludes that...80% more likely to need treatment... > > I wouldn't put it that starkly. I'd say it's more like "Joe Blow" buying a > new ICE car, and at 3000 miles he sees that the oil level on the dipstick is > still the same. So he concludes that "it doesn't use a drop of oil"! > > So he skips the oil changes. 2 years and 30,000 miles later, the car is towed > to the dealer, three quarts low and with a wrecked engine. > > On the other hand, his mechanic "Crusty" swears by 3000 mile oil changes. > That's not always necessary; but it's good insurance. People who do this can > expect to go 200,000 miles before the engine is using any significant amount > of oil. > > So it's more like the blind men and the elephant. Each sees the same data, > but come to different conclusions because of their perspective. > > I'm not some big company; I'm a lone wolf working in his basement. I have to > get my batteries cheap; as bargains, or donations, or old, or used, or on > loan so I don't dare hurt them. That means they aren't likely to be prime > stock. But that's a good thing! I get to see batteries at their WORST, not > just at their best. > > Another thing... > > "The storage battery is one of those peculiar things which > appeals to the imagination, and no more perfect thing could > be desired by stock swindlers. Just as soon as a man gets > working on the secondary battery, it brings out his latent > capacity for lying." -- Thomas A. Edison > > "There are few industries with more BS than the battery > industry. -- Elon Musk > > Battery information has been unreliable for a hundred years. 99% of what you > read is either lying to make money, or the mindless parroting of what someone > else said. > > This mean you should treat everything you read about batteries as BS > ("baloney sandwiches", as Carl Sagan said). You have to *test it for > yourself*! This is tedious; but not particularly difficult or expensive. > > And, you need to keep a skeptical mind. Just because one does X doesn't mean > that they all do X. It's as if there's a devious little demon inside, doing > everything in his power to trick you. With only a few quick tests, he's > likely to lie to you (and get away with it)! So you need to be diligent, and > repeat your tests in different ways to pry the truth out of him. "Oh yeah? > *Prove* it!" > > -- > The greatest pleasure in life is to create something that wasn't > there before. -- Roy Spence > -- > Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
