1.8.1 Battery life is longer than you think

Many people assume residential batteries degrade fast and only last ten years, the same way EV batteries do. It is not true.

Early EV batteries used NMC chemistry, which does degrade quickly. Residential storage today uses LFP, which is fundamentally more stable, cycles more times, and lasts much longer.

The battery model we use most often retains 70% of its capacity after 10,000 cycles over 15 years. A properly sized solar system cycles the battery roughly 300 times per year. After 15 years that's still under 5,000 cycles — well within spec.

You don't need to worry about battery lifespan.