Vacuumschmelze presented a family of current sensors for solar inverters. These sensors are used to monitor the AC power output of solar systems into the power grid and measure its DC component. Unlike conventional In a grid-connected system, the direct current produced by the solar modules is converted into the alternating current required for the grid (115 V / 230 V AC voltage) and fed into the grid. Small-scale inverters have a typical output range of 1.5 – 6 kW, but are mainly around 2 to 3 kW (peak), while larger inverter systems may have output of 30 – 100 kW and higher. The maximum direct current for grid feed-in varies from country to country; it may be as little as a few milliamperes in some European countries. Because the DC component of grid current can saturate the local transformer or transformers of other grid-connected devices, or trip an earth leakage circuit breaker, permitted maximum tolerances are laid down. Current sensors in solar inverters must measure DC components with extremely high accuracy.

Chokes

Common mode chokes by the company can be installed at the input to the inverter (between solar panel and inverter) or at the output to the grid. As component of radio interference suppression filters, the chokes are designed to block or damp undesired interference voltage levels which could cause electromagnetic interference between electronic devices. Peak tolerances for these levels are governed by international regulations and may not be exceeded by solar generators. VAC supplies both common mode chokes for 250 V or 380 V mains operation and high-insulation models for DC voltages of up to 1000 V.