Comment by belval
1 year ago
Unless these are special a "useful life" rating of 5000 cycles mean that after 5000 cycles your battery will be down to about 80% capacity compared to their original MWh rating.
But full cycle is probably not the complete picture when it comes to grid scale storage since they have some control over the charge/discharge rate and they can optimize their usage, a bit like how electric cars allow you to stay in the 20-80% range instead of going all the way up to 100%.
Good point. In 0% to 100% capacity cycle, the battery will be dead long before 5000 cycles. OTOH, listed capacity may already take into account a more gentle 20% to 80%, or less, cycle. https://www.tesla.com/megapack doesn't provide specs, though.