Optimizing your solar consumption: Battery storage guide in Pully

In Pully, with an altitude of 426 m and significant annual global solar irradiation, solar potential is a valuable resource. The city, labeled Energy City since 2017, actively encourages energy transition through the Ecowatt program.

Installing a storage battery is particularly relevant if your photovoltaic system produces a surplus that you do not consume during the day. With 2776 heating degree-days per year, energy demand is constant, and storing produced electricity allows for better coverage of your nighttime needs.

The ideal time to install a storage system is during the review of your photovoltaic installation or if you notice your self-consumption rate is low. During the winter period, when heating is in high demand, having a reserve allows for better management of household energy.

By anticipating this work, you fully align with the goals of the City of Pully Energy Concept, aiming to rationalize consumption and promote the use of renewable energies within the municipal territory.

The choice of a battery depends primarily on your actual consumption profile in the evening and at night, and not just on the power installed on your roof. A battery is useful if your solar production significantly exceeds your daytime consumption.

It is essential to check technical compatibility with your existing inverter before any purchase, as hybrid systems or AC-coupled solutions offer different flexibility depending on the age of your system.

Lithium iron phosphate (LiFePO4) technologies are now the standard for their durability and safety. There are different levels of quality regarding the allowed depth of discharge and the number of guaranteed cycles. It is advisable to consult technical data sheets to favor equipment with a long lifespan.

Finally, sizing must remain consistent : too large a capacity is an unnecessary investment, while too small a capacity will not allow you to cover your essential nighttime electricity needs.

The building stock in Pully is varied, ranging from old villas to more recent constructions. For buildings dating from before 1990, caution is required during any technical intervention, particularly regarding the state of electrical installations and the possible presence of old materials.

If you are planning integration in a basement or garage, ensure that the space is ventilated and that the temperature remains moderate, as solar storage batteries are sensitive to extreme thermal conditions.

The thermal insulation of your house indirectly influences your storage need., via a heat pump) can be better managed by a battery. It is recommended to check the state of the electrical panel during the feasibility study. An update to standards may be required before installing the storage system.

In case of doubt, hire a qualified electrician to validate that your current grid will support the addition of a storage unit without risk of overload or technical failure.

In the canton of Vaud, the installation of solar equipment generally falls under a simplified procedure or an exemption from a building permit. For internal storage systems, no specific authorization is required, provided this does not result in structural modification or a change in the building's exterior appearance.

However, it is advisable to contact the municipality for any questions regarding compliance with the general appearance. If your building is protected or located in a sensitive heritage area, implementation constraints could apply.

Compliance with fire safety is mandatory. Batteries must be installed in accordance with current standards. For outdoor equipment or if the installation changes the appearance of the facade, the Municipality or the Prefect are the competent authorities.

In case of doubt, the simplified procedure consists of submitting a short file to the local urban planning department. Do not forget to request written confirmation of your exemption if you have any doubt about the heritage classification of your property.

The Swiss and Vaud tax system offers interesting possibilities for your energy investments. By law, expenses incurred for measures aimed at rationalizing energy consumption or using renewable energies are 100% deductible from your taxable income.

These investments concern the replacement of obsolete installations or the addition of new elements, such as a storage battery in an existing building., after deducting any subsidies received.

A crucial aspect of taxation is the handling of carry-forwards. If your investments cannot be fully deducted during the year they are incurred, the balance can be carried forward over the next two tax periods.

Note that this option is exclusive : if you choose to deduct actual costs including your energy investments, you cannot claim the flat-rate deduction for the maintenance of your property during the same period.

It is highly recommended to plan your work and check your tax intentions with your advisor before starting the process, as the rules for cumulation are strict.

The execution of a storage battery project unfolds in several logical stages. After validating your quote, the first phase consists of an in-depth technical study of your existing electrical installation.

Once the material is ordered, the physical installation generally requires only a short on-site intervention by qualified professionals.

It is preferable to schedule this work outside of periods of extreme cold, with Pully recording an average of 44 frost days per year, to facilitate access and technical handling that can sometimes be delicate outdoors or in unheated areas.

The commissioning includes configuring the energy management software and performing functional tests with your inverter. Once these tests are completed, the final inspection marks the end of the process.

It is important to allow sufficient time for these software configuration steps, which ensure the optimal performance of your battery. By anticipating your needs, you ensure a smooth transition to increased energy autonomy without disrupting your daily life.

The most common error is underestimating the necessary capacity or unnecessarily oversizing the system. Take the time to analyze your actual consumption records before asking for quotes. A battery is useful if your solar production significantly exceeds your daytime consumption, never forget that.

Before validating a technical choice, systematically ensure the compatibility of the battery model with your current inverter.

Here is a checklist to effectively prepare : check first if your photovoltaic system is sufficiently productive; ask a professional to measure your actual nighttime consumption; validate the space available in a tempered and ventilated room; ensure that your electrical panel complies with current safety standards; check with the municipality if any heritage restrictions apply to your building; compare several quotes clearly detailing the equipment, installation, and commissioning; finally, confirm that the installer provides training on the use of the management software.