Second-life batteries
What happens when a pack is no longer good enough for a car.
You'll learn
- Explain second-life batteries at engineering level
- Read the numbers that define the behaviour
- Apply the idea to a real pack
Overview
A pack at 70% capacity is finished as a car battery but perfectly capable as stationary storage, where mass and volume barely matter.
In depth
- 1Assessment
Read the BMS history, test capacity and resistance module by module.
- 2Sorting
Group modules of similar health so the weakest does not cap the string.
- 3Repackaging
Fit new enclosures, a stationary BMS and grid-tied inverters.
- 4Deployment
Peak shaving, solar self-consumption, charger buffering or grid services.
Key takeaways
Remember this
- 70% capacity is still excellent for stationary use.
- Sorting by health is the key economic step.
- Buffering makes high-power charging viable on weak grids.
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