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Is a battery worth it in 2026? The honest math

Is a battery worth it in 2026? The honest math

Ivan Miric·

Few components on a solar installation draw more heated debate than the battery. Sceptics say it is too expensive. Advocates call it essential. The truth is in between, and it depends heavily on your consumption profile. Here is the math without the marketing gloss.

What a battery actually costs in 2026

Lithium-iron-phosphate (LFP) prices have been flat over 2024/25. In Switzerland today:

  • CHF 600, 900 per usable kWh, including inverter and installation
  • Typical home sizing: 8, 15 kWh
  • Turnkey single-family system: CHF 6,000, 12,000

Premium brands like BYD and Huawei LUNA sit at the upper end but ship with 10-year warranties and long-term service chains.

How big should the battery be?

Rule of thumb: 1 kWh of storage per 1 kWp of PV. Sharper sizing helps:

  • Mostly home during the day: 5–7 kWh is enough, you consume directly
  • Out during the day, home in the evening: 8–12 kWh to cover the evening peak
  • Heat pump and/or EV: 10–15 kWh, the extra load justifies the size

Oversizing hurts. A battery that rarely fills pays back slowly. One that is always full by midday is too small.

What you actually save

The core mechanic: every kWh you self-consume instead of exporting saves the spread between retail and feed-in tariff.

  • 2026 retail: ~30 Rp./kWh
  • 2026 feed-in (new minimum): ~6–12 Rp./kWh
  • Savings per shifted kWh: ~18–24 Rp.

A 10 kWh battery that cycles ~250 times a year shifts roughly 2,000–2,500 kWh from export to self-consumption, worth CHF 400, 600 per year.

Honest payback

At CHF 8,000 invested and CHF 500/year returned: ~16 years. That is about the warranty length. Without rising tariffs a battery is not a money-maker, it is insurance.

The math gets better when:

  • Tariffs rise, many cantons expect further increases in 2027/28
  • Dynamic pricing matures and the battery can charge cheaply at night and discharge during the day
  • You combine heat pump + EV + AC and push annual consumption above 10,000 kWh
  • You operate inside a LEG (possible from 2026) and sell surplus to neighbours

New from 1 January 2026: batteries stop paying grid fees

The Mantelerlass lets storage operators reclaim the grid fee on power they import, store and later re-export (Art. 18d StromVV). This is especially meaningful for community and commercial batteries, adding several cents of margin per kWh.

Our verdict

A battery is not purely a return investment, it is insurance against tariff risk and an autonomy booster. If you are investing anyway, three setups make a battery a clear win in 2026:

  1. Heat pump plus EV in the household
  2. High evening load with day-time absence
  3. A SolarFree contract where we size the battery against your real load profile, not a generic rule

Explore our battery solutions →

All numbers based on Swiss market data as of April 2026. Individual cases may vary.