TechnologyEnergy Storage
Retrofit Battery Storage 2026 – Costs & ROI
Battery storage raises self-consumption from ~30% to 70–80%. We calculate honestly.
Key figures overview
~30 %
Self-consumption without storage
70–80 %
Self-consumption with storage
CHF 800–1400
Cost per kWh capacity
12–18 years
Payback period
Why this combination?
Massively increased self-consumption
Use midday surplus in the evening instead of feeding it in.
Backup power capability
Many home storage units supply defined circuits during a grid outage.
Protection against price increases
Each kWh from storage saves 28–42 Rp./kWh vs. grid.
Peak shaving for businesses
Smooth peak loads and reduce monthly demand charges.
Frequently asked questions
Is battery storage worth it in 2026?
Honestly: payback 12–18 years vs. 10-year warranty. May improve with falling prices.
What size do I need?
1 kWh per 1 kWp solar. For 10 kWp: recommend 8–12 kWh net capacity.
Is there a subsidy for battery storage?
No federal subsidy. Some cantons (GR, GL, OW) offer CHF 200–500/kWh.
Storage analysis – calculate honestly
Calculate your solar potential including heat pump and storage integration.
Calculate subsidy