Guide Complet 2024 : Comparatif des Batteries Solaires - Comment Choisir la Meilleure Solution de Stockage | Wattuneed

Complete Guide 2024: Solar Battery Comparison

Learn how to choose the best storage solution for your photovoltaic installation.
Detailed comparison, price per kWh and expert advice to make the right investment.

Why is this guide essential?

Choosing a storage battery represents a major investment. With various technologies (Lithium, Gel, AGM, OPzS, OPzV) and significant price differences, it is crucial to understand the actual cost per usable kWh over its lifetime to make the right economic choice.

In 2024, many buyers focus on the initial purchase price and overlook key criteria: lifespan, number of cycles and depth of discharge. This comparison helps you identify the solution best suited to your needs and budget.

The 4 Main Solar Battery Technologies

Detailed Analysis by Technology

✓ Lithium Batteries — the premium choice

Why? Very long lifespan, high depth of discharge, low maintenance.

• ✓ 6000+ cycles
• ✓ 80–95% usable capacity
• ✓ very low long-term cost (≈ €0.05/usable kWh)
• ⚠️ higher initial investment
• ⚠️ sensitive to extreme temperatures (quality BMS required)

Recommendation (residential use): Pylontech US3000C / US5000 (reliability and wide compatibility).

✓ Gel / AGM Batteries — accessible solution

Ideal for getting started with a controlled budget, but with shorter lifespan and more limited discharge.

• ✓ lower purchase price
• ✓ simple installation
• ⚠️ ~1200 cycles
• ⚠️ typically limited to 50% discharge

✓ OPzS / OPzV — industrial robustness

Solutions adapted for intensive use and professional systems (or highly equipped homes).

• OPzS: excellent value for money, but requires maintenance
• OPzV: maintenance-free, often preferred when access is difficult

Comparison Table: Price per Usable kWh Over Lifetime

Method: total cost / (cycles × usable capacity).

How to Choose? Our Decision Guide