🔋 Introduction: Why Battery Sizing Matters
When planning a 5kW solar power system, selecting the right battery capacity is one of the most critical decisions you’ll make. Undersized storage means lost energy and limited independence, while oversized systems inflate costs and reduce ROI.
LiFePO4 batteries—known for their long lifespan, thermal stability, and safety—are increasingly the go-to choice for European homes. But what capacity do you actually need?
This guide walks you through how to calculate your ideal battery size, the pros and cons of different capacities, and real-world product comparisons.
⚙️ Step 1: Calculate Your Daily Energy Needs
Start with your average daily energy consumption:
Formula:
Daily Usage (kWh) = Average kW per hour × usage hours per day
For example:
- A typical small EU home uses around 8–12 kWh/day.
- Medium-sized homes might use 15–20 kWh/day.
👉 For a 5kW system, you can expect to generate around 20–25 kWh/day on sunny days.
🔍 Step 2: Determine the Ideal Battery Size
Here’s a quick capacity guideline:
| Daily Usage (kWh) | Recommended Battery Size | Backup Hours | Notes |
|---|---|---|---|
| 8–12 | 5–7 kWh | 8–10 hrs | For essential loads only |
| 13–18 | 10 kWh | 10–15 hrs | Covers most household use |
| 19–25 | 15 kWh | 15+ hrs | For full-day backup / off-grid |
💡 Tip: Aim for at least 1.5× your average daily usage if energy independence is a priority.
📦 Recommended Products (with Comparison)
Let’s compare three popular LiFePO4 options available in Europe, including our flagship model:
| Model | Capacity | Voltage | Cycle Life | Certification | Expandable | Price Range |
|---|---|---|---|---|---|---|
| JYH-EB2048 | 5.12 kWh | 51.2V | 6000+ | CE, UN38.3 | ✅ Yes | €700–€900 |
| BYD LVS 10 | 10.24 kWh | 51.2V | 6000 | CE, VDE | ✅ Yes | €4,000+ |
| Pylontech US3000 | 3.5 kWh | 48V | 6000 | CE, UN38.3 | ✅ Yes | €950–€1,100 |
📌 Our JYH-EB2048 is ideal for modular builds—stack three units for a total of 15kWh.
🌍 EU Regulations & Installation
In most EU countries:
- Batteries over 2 kWh may require registration.
- Battery + inverter combos must be CE certified.
- Fire safety clearance is required for indoor installs.
📎 VDE Battery Safety Standard (PDF)
📎 EU Solar Guidelines – European Commission
🔧 System Configuration Tips
- Use a hybrid inverter like JYH-Inverter to enable seamless charge/discharge management.
- Connect via BMS (Battery Management System) for safe operation.
- Install near your inverter for minimal wiring loss.
For more information, refer to our guide:
📎 How to Connect LiFePO4 Batteries to Your Solar System
🧾 Conclusion: Smarter Sizing = Better Returns
Choosing the right battery size ensures your 5kW solar system delivers maximum independence and efficiency. The JYH-EB2048 offers an affordable, stackable, and certified solution that’s ideal for most European homes.
Looking for help? Contact us for a free consultation.
