A photovoltaic installation is an investment that can reduce electricity and heating bills when combined with a heat pump. In order for its effect to be measurable, it must operate effectively and optimally. It often happens that photovoltaic inverters switch off cyclically during voltage surges. This can be prevented by using the CP-721-FPV voltage relay. On the one hand, this relay reduces the risk of the inverter switching off. On the other hand, it increases self-consumption in domestic installations. How? You can find out how the CP-721-FPV relay works and how to configure it in our video guide.