1. Why Accurate Calculation Matters
Incorrect battery sizing leads to:
- Power shortages
- System inefficiency
- Higher costs
2. Step-by-Step Calculation Method
Step 1: Determine Load (kW)
Example:
- Total load = 3 kW
Step 2: Define Backup Time
Example:
- Backup = 4 hours
Step 3: Calculate Energy Needed
Energy = Load × Time
👉 3 × 4 = 12 kWh
Step 4: Adjust for DoD
If DoD = 80%:
Required capacity = 12 ÷ 0.8 = 15 kWh
Step 5: Add System Losses
Add 10–20%
👉 Final capacity ≈ 16–18 kWh
3. Real Example (Highly Important)
System:
- Load: 5 kW
- Backup: 6 hours
Calculation:
- Energy = 30 kWh
- Adjusted = 37–40 kWh
4. Pro Tips
- Always oversize slightly
- Consider future expansion
- Use high-efficiency batteries
5. Conclusion
Correct sizing ensures:
- Stable system
- Longer battery life
- Better ROI
📩 CTA
👉 Need help calculating your system?
👉 Send your load details — we’ll design it for free