To which 'contradictory' statements to you refer?garygid wrote:In spite of AndyH's best design, and confidence in Nissan, we do not yet KNOW what they ACTUALLY implemented, or why Nissan has made seemingly contradictory statements about how to use THEIR battery.
As a retired military analyst and lithium importer/vendor, I strongly disagree with both parts of this statement. There is enough information available from various manufacturers with which we can bound performance to a fairly high confidence level. And the same for management systems, methods, and practices. There are only so many ways to manage a multi-cell pack and only a limited number of companies transferring those strategies to silicon.garygid wrote:Comparisons to other similar battery chemistries or conjecture as to what Nissan MIGHT or SHOULD have done get us closer to understanding, and are a GREAT education for what is possible, but does not tell us WHEN or HOW Nissan attempts to "protect" and "equalize" their cells.
While I agree that we don't know exactly to three decimal places how these particular cells will age, it is clear that Nissan's systems give us more than enough information to track pack and cell health and thus learn how to minimize the inevitable decay. And you can certainly bet that Nissan knows to a high confidence level how the pack will perform - they've been at this for ~17 years, afterall - and THEY are the ones putting big money and reputation on the line to bring us the Leaf!garygid wrote:Further, we do not know how the cells WILL AGE, and Nissan does not yet display enough information to help us extend the useful life.
Nothing is obvious to the uninformed - and being informed is possible but voluntary.
There are mandatory pack health and wellness visits with a dealership, and there is ample information available from the car's diagnostics systems - with better precision than the capacity display.garygid wrote:It appears that the estimated capacity has to drop 17% (to 83%) BEFORE there is any displayed indication (one bar capacity loss). By then, it might be too late to change usage patterns to "preserve" the battery better.
I know you're not really trying to suggest that the battery is bad because you don't like the bar graph?!
Yes? And this is a problem why?garygid wrote:Basically, we have a LOT of guesses, and LITTLE really helpful information, for example: frequent QC should be avoided, but it is OK to do QC occasionally, even 3 or 4 times a day.
Whew! With THIS I can agree!garygid wrote:But, this is probably the way it will be for early adopters. We will learn a lot more as we use, observe, and measure. The reports of experiences and observations will help guide the rest of us. Keep up the good work.