Re: Battery degradation info, 80% vs. 100% daily charge
Posted: Tue Jul 12, 2011 1:18 pm
I'm afraid it doesn't work that way. The above seems to imply that one module will go "bad" before the others do. If this were to happen in a dramatic way, it would show up sooner than later, and would be replaced under warranty. The Battery Monitoring System, plus all the research that went into the battery, suggests that they won't get out of balance in the first place. And if they did nonetheless, the most difference you could have by changing out one module of 48 would be 1/48 or 2 percent of the total.electricfuture wrote:The good news concerning new batteries is that my understanding is that you don't have to replace all of them at once. The battery 4? packs are individually monitored. Thus you could just replace say 20% to bring your range back to the original 100 miles. As time goes on I plan to replace them in stages over a 5 year period starting 8-10 years from now.
Replace 20% of the modules? That would be 10 modules. But if the new ones were at 100%, and the ones you didn't change had 80% capacity, the total capacity would be...80%. That's because they're in series, and the weakest module limits the total. Remember that the BMS can monitor the differences, but it can't modify the current draw pattern from them.