Solar Diag

Online solutions for enhancing the safety and efficiency of operating photovoltaic panels and power plants.

Key features

  • Fire prevention
  • Identification of dangerous touch voltage
  • Remote and local disconnection
  • Diagnostics and optimisation of photovoltaic panel performance

Photovoltaic panels

Operational Efficiency

Due to the series connection of PV panels, the resulting power delivered to the grid depends on the weakest among them. If a fault is not diagnosed in time, it leads to energy losses of up to several hundred kWh per year in each string, corresponding to economic losses in the order of thousands of crowns per year.

Safety Risks

With the increasing number of photovoltaic installations, the danger of fires also grows. Their source can be:

  • Series arc – PV panels and circuits have a high number of connections, where a transitional state can occur with the possibility of local ignition
  • Parallel short-circuit – shorting of output conductors
  • Leakage current (short-circuit to frame) – dangerous touch voltage arises due to poor grounding

ModemTec solution

ModemTec, a longstanding leader in the field of powerline communication and electrical line diagnostics, presents a unique solution that protects PV panel owners from the danger of fires. Solar Diag is a unique online diagnostic tool that can detect and warn of potentially dangerous conditions, as well as identify reduced performance of installed panels.

How it works

The diagnostic unit MT-SD11 is placed at the output of an individual string (approx. 20 panels connected in series). This unit measures voltage and current and services sensors for sunlight and temperature.

Communication with this unit occurs via the direct current bus, to which the individual strings are connected, and the output of this bus is in the inverter, where the driver servicing the diagnostic units is located. From it, the output leads to the superior diagnostic software. In case of a critical situation, the unit can safely disconnect the entire string.

Solar Diag Brochure