3 ms·
It's not just about capacity (80% is still a lot), it's that degraded batteries lose their ability to deliver high current under load—so acceleration suffers an
by benzible 1y ago
It's not just about capacity (80% is still a lot), it's that degraded batteries lose their ability to deliver high current under load—so acceleration suffers and voltage sags under hard pulls. For grid storage, you're doing slow, steady charge/discharge cycles over hours, so the same battery that can't handle aggressive driving anymore works perfectly fine. Plus, grid storage has virtually unlimited space and no range anxiety, so if you need 25% more packs to hit your capacity target, you just stack them in a warehouse where real estate is cheap.
- miahi 1y agoAlso, batteries will degrade faster over time when they start to degrade, because they need more frequent charging. Their internal resistance increase and that promotes heat buildup during fast charging/discharging, another thing that promotes degradation. Slow charge/discharge cycles also help with heat management.
- ramses0 1y agoLooking forward to the grid-scale warehouse fire of battery packs popping off...
- dylan604 1y agoThey claim to have taken the Moss Landing fire into account with how they are placing their batteries. We won't know if they've really solved the problem or not until their first battery pack experiences a runaway thermal event.
- hinkley 1y ago> For grid storage, you're doing slow, steady charge/discharge cycles over hours. Only if the feed in is a bottleneck. For peak shaving you could go faster.