BYD Battery-Box Premium HVS
From CHF 6,500
- Capacity
- 5.1 to 22.1 kWh
- Chemistry
- LFP (Lithium Iron Phosphate)
- Warranty
- 10 years / 60%
- Cycles
- ≥ 6,000 cycles
Modular 2.56 kWh, compatible with Fronius, Sungrow, KOSTAL.
Solar battery storage in Switzerland — price, installation and grants.
I.ON installs BYD, Huawei and Fronius solar battery storage for homeowners and SMEs across Western Switzerland. Paired with your solar panel installation, a battery lifts your self-consumption from 30% to 70–80%. Consumption curve analysis, sizing, paperwork and 10-year monitoring handled by our in-house team.
- Free on-site study
- Detailed quote within 7 days
- Cantonal subsidies handled
- Direct installer
Why store
From 30% to 80% self-consumption.
A solar installation without a battery self-consumes on average 30% of its production. The rest is exported at the feed-in tariff (8–12 ct/kWh), while you buy back in the evening at the purchase price (26–32 ct/kWh). This gap is exactly what the battery captures.
With a 10 kWh battery on an 8 kWp installation, self-consumption rises to 70–80%. The extra saving is CHF 600 to 900 per year. Over 15 years, the cumulative gain exceeds CHF 10,000 — which pays for the battery several times over.
Beyond financial return, the battery delivers three concrete things: independence from tariff hikes (electricity has risen by 27% on average in Switzerland since 2022), coverage of evening loads when solar production is zero, and — with the backup function — partial autonomy during a grid outage.
2026 comparison
The batteries we install in Western Switzerland.
Three brands selected for long-term reliability, compatibility with common inverters in Switzerland, and 10-year spare parts availability.
Huawei Luna 2000
From CHF 7,000
- Capacity
- 5 to 30 kWh
- Chemistry
- LFP
- Warranty
- 10 years / 60%
- Cycles
- ≥ 6,000 cycles
Per-module optimisers, FusionSolar monitoring, three-phase redundancy.
Fronius Reserva
From CHF 8,500
- Capacity
- 6 to 24 kWh
- Chemistry
- LFP
- Warranty
- 10 years / 70%
- Cycles
- ≥ 8,000 cycles
Integrated inverter + battery, blackout backup function included.
Sizing
What battery capacity for your home?
Indicative figures. Final sizing comes after reading your hourly consumption curve provided by the grid operator.
| Profile | Consumption | Recommended capacity | Note |
|---|---|---|---|
| Apartment / small house | 2,500 to 3,500 kWh/year | 5 to 7 kWh | Target: cover evening and night consumption. |
| 4–5 room house | 4,000 to 5,500 kWh/year | 10 kWh | Recommended standard in Western Switzerland. Self-consumption 65–75%. |
| House with heat pump | 6,000 to 9,000 kWh/year | 13 to 15 kWh | Stores daytime PV surplus to power the heat pump in the evening. |
| Large house + EV charging | 9,000 to 15,000 kWh/year | 15 to 22 kWh | Pair with an 11 kW charger steered by the inverter. |
Our approach
From consumption analysis to a 10-year warranty.
- 01
Consumption analysis
Reading the hourly load curve provided by the grid operator (Romande Energie, SIG, Groupe E) over 12 months. Identifying evening / night / weekend power draws to size the battery precisely.
- 02
Brand and capacity selection
BYD, Huawei or Fronius selection based on compatibility with your existing inverter and the need for backup capability. Argued recommendation, no imposed brand.
- 03
Permits and admin
Notification to the grid operator, application for cantonal or municipal subsidy where eligible, verification of indoor installation rules (ventilation, clearance, accessibility).
- 04
Installation and connection
Mounted in the utility room, basement or garage. High-voltage DC wiring, inverter connection, firmware commissioning. 1 to 2 days depending on configuration. Charge / discharge tests with the customer.
- 05
Monitoring and 10-year warranty
Mobile app included (Fronius Solar.web, BYD Be Connect, Huawei FusionSolar). Cycle tracking, state of health (SoH), anomaly alerts. Our team responds within 48 hours under warranty.
Grants and tax
What reduces the net cost of your battery.
No federal one-time payment for the battery alone. Payback comes from the tax deduction, cantonal premiums where available, and above all from the self-consumption gain.
Cantonal grants
No direct federal subsidy for the battery alone, but Geneva (éco21 programme), Fribourg and several Vaud municipalities (Lausanne, Nyon, Morges) offer a CHF 500 to 2,000 grant when the battery accompanies a new PV installation.
Tax deduction
The net cost of the battery is 100% deductible from taxable income as an energy investment. At a 27% marginal rate, that's a CHF 1,800 to 3,500 tax saving on a 10 kWh battery.
Global renovation bonus
If the battery is part of a broader project (PV + heat pump + insulation), a cumulative cantonal bonus can reach 15–30% of the total individual grants, depending on the canton.
Feed-in tariff arbitrage
With a battery, you export less to the grid and consume more of your production. At a feed-in tariff of 8–12 ct/kWh against a purchase price of 26–32 ct/kWh, this gap drives most of the battery's payback.
Customer reviews
What our clients say,in full transparency.
Février 2026
“Installation d'une pompe à chaleur en remplacement d'un potager à bois pour une villa achetée en 2025. I.ON a accepté de maintenir le prix du devis réalisé plus d'une année avant par la propriétaire précédente. L'ensemble des travaux a été effectué par une équipe très compétente et sympathique. Tout s'est bien déroulé dans les délais fixés. I.ON ne m'a pas laissé tomber lorsqu'il a fallu faire fonctionner les panneaux thermiques existants avec la pompe à chaleur via le régulateur pour tout automatiser.”
Novembre 2025
“Installation réalisée en décembre 2023. Avec le recul de plusieurs années de production : matériel conseillé de très bonne qualité (PV Longi HI-MO6 + onduleur triphasé SMA), simulation de production réaliste et même un peu pessimiste, système de pilotage SMA très ouvert et compatible. Avec deux véhicules électriques et 8,8 kWc installés, 60 à 70 % de mes besoins annuels en mobilité sont couverts par le solaire. Les contacts avec l'équipe ont toujours été très bons, avec des échanges constructifs sur des aspects parfois très pointus.”
Novembre 2025
“Pour le remplacement de notre chaudière à gaz, nous avons décidé d'équiper notre PPE de 8 appartements (24 personnes) avec pompe à chaleur et panneaux photovoltaïques. Entre les grands groupes peu intéressés et les PME du secteur sanitaire surtout actives sur les villas, seul I.ON a su nous écouter et proposer un équipement correctement dimensionné pour chauffer notre immeuble et produire 900 litres d'eau chaude sanitaire par jour. Mention excellente pour l'équipe interne : discrète mais très efficace dans ses relations avec les autorités cantonales et l'administration de notre PPE. Aucun copropriétaire n'a eu à subir de gêne pendant les travaux.”
Octobre 2025
“Expérience absolument excellente du début à la fin avec I.ON. Deux équipes sont intervenues : l'une pour l'installation photovoltaïque (panneaux solaires, batterie et borne de recharge pour voiture électrique), l'autre pour la pompe à chaleur, le réseau de conduites et les nouveaux radiateurs. Tout a été réalisé de manière rapide, efficace et avec une excellente qualité. Le service après-vente est tout aussi remarquable : à chaque question, nous avons toujours obtenu une réponse claire et rapide.”
Décembre 2024
“Un grand merci à toute l'équipe de I.ON Energy pour l'installation de notre pompe à chaleur géothermique. Un commercial qui connaît le produit et qui a suivi l'intégralité de notre projet, c'était appréciable d'avoir un point de contact pour gérer les différents corps de métier (forage, installation de la sonde, chauffagiste, électricien, isolation, démarches administratives). Après l'installation, l'équipe continue à répondre aux questions et partage ses conseils.”
Mai 2025
“Excellent travail avec un rapport qualité-prix imbattable : des travailleurs très consciencieux et compétents, un vendeur très sympathique et de bon conseil, une direction et un back-office sérieux. À recommander sans réserve dans la jungle du photovoltaïque.”
Frequently asked
What homeowners ask us most.
Another question on battery storage, inverter compatibility or lead times in Western Switzerland? Our team replies within 24 hours.
How much does solar battery storage cost in Switzerland?
A battery storage system installed by I.ON starts at CHF 6,500 for 10 kWh (BYD Battery-Box). A Huawei Luna 2000 or a Fronius Reserva of equivalent capacity ranges from CHF 7,000 to CHF 9,000, installation included. The price depends on capacity, brand and compatibility with your existing inverter.
Is a solar battery worth it in Switzerland?
Without a battery, a household self-consumes about 30% of its solar production. With a battery, that figure rises to 70–80%. For an 8 kWp installation in Western Switzerland, the extra saving is CHF 600 to 900 per year. The payback period of a battery is 8 to 12 years depending on your supplier's electricity rate.
What battery capacity for a single-family home?
For a 4–5 room house consuming 4,000 to 5,500 kWh per year, a 10 kWh battery is recommended. It covers evening and night consumption. For a house with a heat pump or an EV charger, scale up to 13–15 kWh. I.ON sizes the battery based on your actual consumption curve (12-month meter reading).
Can a battery be added to an existing solar installation?
Yes, in most cases. If your inverter is compatible (Fronius, SolarEdge, Sungrow, Huawei, KOSTAL), the battery connects directly on the DC or AC side depending on the topology. Otherwise, a partial inverter replacement may be required. I.ON assesses compatibility during the free study and proposes the most cost-effective solution.
How long does a solar battery last?
The LFP (Lithium Iron Phosphate) batteries installed by I.ON have a lifespan of 12 to 15 years, or 6,000 to 10,000 cycles. The manufacturer warranty covers 10 years with a minimum residual capacity of 60 to 70%. Beyond that, the battery keeps running with reduced capacity, with no safety risk.
Does the battery work during a power outage?
Only if the installation includes the backup function (Fronius Reserva by default, Huawei and BYD optional with a dedicated module). Without backup, the battery is disconnected from the grid for safety reasons during an outage. With backup, you retain 5 to 15 kW of autonomy on prioritised circuits.
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