Home battery in 2026: price, capacity and return
Updated in September 2026. A home battery stores surplus solar electricity for use later in the day. The right battery is not simply the largest one: its capacity should match your solar production, consumption profile and future plans.
Which capacity suits your home?
We assess annual electricity consumption, daytime and evening use, solar-panel output, injection, dynamic tariffs and future consumption from an EV or heat pump. This prevents oversizing and unnecessary investment.
Indicative all-in prices
- 5 kWh: approximately €3,500
- 10 kWh: approximately €6,000–€6,500
- 15 kWh: approximately €8,500–€9,500
- 20 kWh: approximately €11,000–€12,000
These are indicative installed prices. The final investment depends on the battery technology, inverter compatibility, backup functionality, electrical modifications and installation conditions.
How much can a battery save?
Savings come from increasing self-consumption, reducing grid purchases and, where relevant, shifting consumption to favourable tariff periods. The return therefore depends on your actual energy profile. We provide a transparent scenario rather than a guaranteed payback period.
Battery, solar panels and energy management
A smart energy-management system can coordinate the battery, solar panels, EV charger and heat pump. This helps use locally generated electricity at the most valuable time.
Frequently asked questions
Is a 10 kWh battery suitable for every household?
No. For some homes 5 kWh is sufficient, while higher consumption or future electrification may justify more capacity.
Can a battery work during a power cut?
Only when the selected system includes compatible backup hardware and is designed for this purpose.
