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Energy storage

Storage

What is an energy storage?

A battery storage system is the ideal complement to a solar power system, because households don't need as much solar power as they produce. The energy storage system stores the excess energy produced by the photovoltaic system during the day. Thanks to the battery storage, solar power is also available in the evenings, at night, and in the mornings.

What is an energy storage?

The solar system self-check

You benefit from an independent power supply
Less dependent on rising electricity prices.
They consume 100% emission-free electricity.
You can use your solar energy day and night.

FreeState storage system comparison

ManufacturerHuaweiSunE3DC
InverterOnly usable with the specified inverter (DC system) KTL-M1Compatible with any inverter (AC system)All in One
Storage Capacity5–90 kWh11–55 kWh4 – 84 kWh
Emergency power2 lighting groups (e.g., refrigerator & living room lighting)Entire house without a heat pumpEntire house with heat pump
Island operationYes, limitedUnder reviewYes
Costs/Indicative Prices:
installed, excl. VAT
Prices exclude inverter, emergency power or off-grid operation (except E3DC)
14 kWh: From CHF 12,000.– 21 kWh: From CHF 17,000.–11 kWh: From CHF 13,000.– 22 kWh: From CHF 17,000.–14 kWh: From CHF 21,000.– 18 kWh: From CHF 24,000.– 21 kWh: From CHF 25,000.–
SmartEnergy, FreeState ONE Installed, excluding VAT.
From CHF 1,500 (Data logger only, without consumption measurement)
From CHF 3,900.–, with boiler control 50% and 100%
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Photovoltaic system and electricity storage

The perfect combination

Configure your own solar system in minutes with our solar calculator and receive a concrete offer immediately:

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When does a battery storage system make sense?

Solar panels produce the most electricity at midday, when household consumption is usually low. Without storage, excess energy is fed into the grid at low compensation rates. Maximizing self-consumption increases profitability and reduces electricity costs.

With a suitable storage solution, self-consumption can be increased from 30-35% to around 70%

Storage

How does an energy storage system work?

Solar energy can be used directly, stored in a battery, or fed into the grid. Excess power charges the battery, supplying the home from evening to morning; grid power is used only when the battery is empty. Optimal performance depends on the right system and battery size, ideally combined with intelligent energy control.

How does an energy storage system work?
Battery Storage Installation
Storage

Battery Storage Installation

Based on your specific situation and needs, our experts will recommend either the AC or DC system. Installation is carried out by our experienced specialists, all of whom are certified by the manufacturer. FreeState automatically registers each installed battery with Inobat, ensuring the proper disposal of your aging energy storage system

PV System

Our Storage Solutions

We work with leading manufacturers to offer you reliable, high-performance energy storage systems tailored to your needs.

Key Features
Whole-home emergency power
Integrated inverter (up to 15 kWp)
Expandable capacity (18–21 kWh)
Smart energy management
Remote control & home automation integration
Solar-optimized EV charging
Warranty
10-year manufacturer warranty
Free service
Options
Wallbox charging station
Bidirectional charging interface
Modbus / KNX connectivity
Loxone integration

SigenStor Battery Storage

SigenStor Battery Storage
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Key Features
Lithium iron phosphate technology
Smart software for higher self-consumption
App-based monitoring & analytics
Capacity: 11–55 kWh
Expandable at any time
Warranty
10-year system warranty (80% capacity)
Options
Emergency power (Sonnen Protect 8000)

sonnenBatterie

sonnenBatterie
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Key Features
Space-saving design
Modular & expandable
Compatible with Kostal & SolarEdge
20 years of battery expertise
Warranty
10 years on BYD battery
5–12 years on inverters (depending on brand)

BYD

BYD
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Highlights
Modular & expandable
Compatible with Huawei inverters (1- & 3-phase)
Smart app integration
100% depth of discharge
Warranty
10-year warranty (80% usable energy)

HUAWEI LUNA

HUAWEI LUNA
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