Correct BESS sizing determines ROI. This lesson provides expert knowledge for installers and energy consultants.
The 5 Sizing Factors
- Load profile: When is how much consumed?
- PV generation: How much solar power available?
- Use case: Self-consumption, arbitrage, peak-shaving?
- Cycles/day: How often is the storage used?
- Budget: Customer investment range
Formula: Optimal Capacity
Capacity (kWh) = Daily consumption × (1 - Self-consumption rate) × 0.8Understanding C-Rate
| C-Rate | Meaning | Application |
|---|---|---|
| 0.5C | 2h charge/discharge | Self-consumption |
| 1C | 1h charge/discharge | Arbitrage |
| 2C | 30min charge/discharge | Peak-shaving |
| 4C+ | 15min charge/discharge | Grid services |
Target for commercial: ROI under 5 years, ideally 2-3 years.
Sizing tool in Stromfee Academy Lesson 9.
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