1. Understand the limits of statistics
SAIDI measures average interruption duration per customer. ElCom’s 2024 report counts interruptions lasting at least three minutes. That report alone cannot establish the frequency or cause of shorter events at your property. Ask for information about your address and the times observed.
2. Record events before drawing conclusions
Record the date, time, affected devices, observed duration and error messages. Keep available logs and ask the DSO whether a matching grid event occurred. A smart plug or device log can miss brief events. An electrical contractor should inspect the installation; where needed, a specialist can select a suitable analyser and interpret its measurements.
3. Define the required continuity
List essential circuits, their power demand and starting currents. Establish the maximum interruption they can tolerate and the runtime required. For medical equipment, have the solution validated by its supplier and the professional responsible for its use. An advertisement for fast switching does not establish compatibility.
4. Check the proposed model’s backup function
Request documentation for the model sold in Switzerland: compatible battery, switching equipment, supplied circuits, power, reserve and restart behaviour. For example, Fronius describes PV Point as a backup circuit with an interruption; its models do not all provide the same functions. Compare solar backup and uninterruptible power separately, then request an appropriate commissioning test.
5. Prepare a damage file
Where possible, keep invoices, photos, logs and the diagnosis before replacing devices. Promptly contact the DSO and insurer and ask which procedure and deadlines apply to your contract. Liability and insurance cover are not automatic. If disputed, have the facts and relevant legal basis assessed before taking formal action.