Installing a solar storage battery in Montreux: A guide for homeowners

Montreux, with an irradiation of 1,349 kWh/m²/year, benefits from efficient photovoltaic production. Choosing to install a battery is justified when your production clearly exceeds your daytime consumption. As a city with the Gold Energy City label, Montreux aims to reduce greenhouse gas emissions by 70% by 2040.

Storage allows you to lead this transition individually.

The best time to undertake this work is when reviewing your overall energy system. With 2,560 heating degree days per year, thermal management is a major part of your bills. Storing solar energy produced during the day to power heating or cooling systems in the evening helps smooth out demand peaks.

A battery is useful if you notice your inverter is consistently feeding excess energy into the grid that could be utilized by your own consumption.

The market offers various battery technologies, primarily based on Lithium Iron Phosphate (LiFePO4) for their durability and safety. When choosing your equipment, the battery capacity should be sized according to your evening consumption, not just the peak power of your solar panels.

Under-sizing would limit the economic benefit, while over-sizing would unnecessarily increase your investment.

A critical step is checking compatibility with your existing inverter. Some batteries require a hybrid inverter capable of managing bidirectional flows between panels, the grid, and storage. Other systems, called AC-coupled, allow adding a battery to an existing solar installation.

It is essential to evaluate the discharge performance and life cycle of the proposed equipment. Prioritize smart monitoring options that allow you to visualize your self-consumption rate in real-time via a dedicated app, facilitating daily management of your energy flows.

In Montreux, the building stock is diverse, ranging from recent villas to older buildings with complex structures. If your building was constructed before 1990, special attention must be paid to the condition of electrical installations when integrating the battery.

Wiring must meet current safety standards to handle charging and discharging.1°C.

In older houses, insulation may be limited, increasing energy needs. Before adding a battery, verify if your electrical panel has the necessary space to accommodate new management and protection components. Also ensure that the support structure is adequate if the battery is wall-mounted.

An analysis of your domestic electrical network by a qualified electrician is essential to avoid overheating or current instability in aging installations.

For solar installations in Montreux, you must submit a notification form along with a site plan, a cadastral extract, and photos of the building and planned installation. These steps are necessary to ensure the harmonious integration of equipment into the urban landscape.

Generally, solar installations are subject to a simplified procedure or an exemption from a building permit. However, if your building is protected or located in a specific area of Montreux's heritage, additional constraints may apply.

It is highly recommended to contact the relevant authorities, the municipality or the prefect, before ordering your equipment. Even in cases of exemption, verify your project's compliance with the municipal energy plan (PDCén) and exterior appearance.

Do not start any work without receiving confirmation of the applicable procedure. Archiving your documents is important to prove the legality of the installation in the event of a property resale.

Regarding taxation, Swiss law allows for the deduction of investments aimed at saving energy. The tax deduction rate is 100% for expenses incurred to rationalize energy consumption or use renewable energies. These investments concern the replacement or addition of installations in existing buildings.

If costs cannot be fully accounted for during the year of execution, the balance can be carried forward to the following two tax periods, provided the net income is not negative.

It is crucial to note that if measures are subsidized by a public entity, you can only deduct the costs you actually bear yourself. Application for any aid or confirmation of tax modalities must be made before work begins. Scrupulously keep all detailed invoices.

The choice between deducting actual costs and the flat-rate deduction is made at each tax period. If you opt for carrying forward costs, the flat-rate deduction is not possible for that period.

The typical workflow for a solar storage project begins with a diagnostic and quote phase, followed by obtaining necessary permits. Although Montreux experiences about 31 frost days per year, internal electrical work related to the battery is not significantly affected by winter conditions, unlike roofing work.

However, it is recommended to plan installations before peak seasonal demand periods to ensure the availability of tradespeople and equipment.

Once the installation is administratively validated, the work focuses on mounting supports, electrical connection to the panel, and configuring management software. Technical steps include securing the grid, installing the battery, connecting to the existing inverter, and load testing.

Upon completion, a technical handover with your installer is essential to verify correct operation and communication between components. Allow time for commissioning, during which the system will be configured according to your consumption habits.

Before requesting quotes, ensure you have your annual electricity bills to accurately assess your nighttime consumption. Verify the available space in your technical room or garage, ensuring the area is dry and well-ventilated.

Do not neglect to check if your current PV installation is compatible with adding a battery, or if an inverter update is needed. Request several comparative quotes and ensure each installer visits the site to inspect your existing electrical panel.

A classic mistake is ignoring the battery discharge capacity : a high-capacity battery is useless if it cannot deliver enough instantaneous power for your domestic needs.

Do not focus solely on price; the quality of after-sales service and the manufacturer's warranty on charge cycles are decisive criteria for long-term profitability. Finally, never forget to clarify the administrative procedure with the municipality before signing any engagement contract, to avoid any future blockages.