3 ms·

The manufacturers certainly list it as part of the expected life. Lipo batteries for example are guaranteed for 6000 cycles at which point they will have 80% of

The manufacturers certainly list it as part of the expected life. Lipo batteries for example are guaranteed for 6000 cycles at which point they will have 80% of their rated capacity and a minimum of 10 years. So they are fairly certain one of those two criteria is going to lead to the battery no longer meeting >80% capacity. But that is the other thing about them only lasting 6k cycles or 10 years, its not like the battery is expected to be dead just lacking a fifth of its capacity. What is happening with batteries out of old EVs today is either cell scavenging and remade into new batteries or just racking the whole battery into grid storage. Per KWH they pretty cheap once they are that degraded but still quite usable in other applications.

anonuser123456 3y ago
This is depressing. I had never really considered chronological age when looking at batteries. The longevity is really important for the ultimate economic viability and I’ve been tracking that to decide when to pull the trigger on a home battery. A 6000 or 10 year cycle rating means functionally 10 years for a solar deployment because you are only cycling the batteries 1x per day. I was hoping you could get 20 years out of such a system (thus halving the cost). Bummer.
- ProllyInfamous 3y ago
  Unless you live in California, and use a "time of day" meter [for kWH offsetting], there are few reasons you would need at-home battery storage (other than power outages... get a gasoline generator, instead!). Direct-tie inverters utilize "the electric grid" as your battery/capacitor... unless you are off the grid. Also, there is a glaring safety defect that violates UL, contained within every Tesla Powerwall 2... so don't get one of those.