There were some comments about UPSs some posts before saying they are not really necessary. And when I read the post of Michael.K I remember another thing. It were not SD-Cards or RPis, that failed repeatedly, but LED lamps. So we measured the grid voltage in our home and recorded the readings during one year. It turned out, that it was always near the upper limit, and sometimes even above it. We then complained to the electric power supplier company and presented our measurements. They reacted very quickly and changed the settings of the transformer. Since then the voltage is within the limits. I guess this can influence the lifetime of the equipment, too. I know, there is a power supply between grid and RPi that transforms the voltage. But it cannot always filter all peaks of overvoltage.
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