Help CenterPerformance & Lifetime
Component lifespan and replacement intervals
Performance3 min readUpdated: 2026-08
A solar project combines components with very different lifespans. Anticipating their replacements is essential for a realistic ROI and total cost of ownership calculation.
| Component | Typical lifespan | Note |
|---|---|---|
| Solar panels | 25–30 years | Gradual degradation, generally no abrupt failure |
| Inverter | 10–15 years | The component most often replaced once over the system's lifetime |
| Lead-acid battery (AGM/Gel) | 3–5 years | Strongly depends on DoD and temperature |
| LiFePO4 battery | 8–12 years | Well beyond that with moderate DoD and controlled temperature |
| Charge controller (MPPT) | 10 years | Often as reliable as the inverter |
| Cables, connectors, structure | 20+ years | With a careful install and properly protected connections |
For a 20–25 year ROI calculation, include at least one inverter replacement and two to three lead-acid battery replacements (or a single one for LiFePO4) in the total cost.
A quote that only shows the initial cost without mentioning future replacements badly underestimates the real cost over the system's lifetime — particularly for the chosen battery technology.
Common mistakes
- Comparing two plans only on initial cost without accounting for future replacements
- Forgetting to budget for an inverter replacement in a 20-year ROI calculation
- Underestimating lead-acid battery replacement frequency in a hot climate