Recently, problems have begun to appear in installations where electronic devices are connected in homes equipped with photovoltaic (PV) systems.

1. For sensitive electronic equipment such as dosing stations, frequency converters, and other control electronics that may react to short power interruptions or phase voltage/current shifts, it is not recommended to connect them to inverter outputs intended solely for surplus-load devices — such as boilers, direct heaters, or electric heating systems — where these issues typically do not occur.
2. This problem can also appear when devices are connected to backup outputs (those powered by the PV system’s battery during a grid outage).
   During the switching process between the inverter and the public grid, a brief power interruption can occur, which can negatively affect sensitive devices, especially frequency converters.
3. Standard electrical circuits connected directly to the public distribution grid are less susceptible to these disturbances and potential voltage spikes.
   Therefore, all critical equipment should be connected to grid-linked circuits, where the inverter handles energy export by adjusting the voltage and current vector phase.
4. Always use products from reputable manufacturers, which are more likely to meet the required technical standards and ensure stable output characteristics, minimizing the risk of such problems.
5. Another essential aspect of PV installation is proper grounding and the use of surge protection devices throughout the network and around sensitive equipment.
   If grounding or surge protection is installed incorrectly, large voltage spikes may occur — both during inverter operation and during thunderstorms or electrostatic discharges.

Recommended protective components:

• Surge protection devices (SPD)
• Fuse disconnector installed before the SPD

All these measures should be considered already at the electrical design stage.
This recommendation applies especially to installations not covered by a complete protection design.

Neglecting proper protection may lead to irreversible damage to sensitive electronic components, such as dosing systems, remote control units, and frequency inverters used in both circulation pumps and heat pumps.