Today's solar inverter layout needs based on the current sensor compact, low-cost and reliable ground current detection scheme. The LEM accordingly specially designed CT series sensor. They are rated range of 100mA, 200mA and 400mA current device rated current to provide a linear output of 5 volts. Under the conditions of the 80% and 90% of the rated current, the response time of less than 20 milliseconds and 60 milliseconds. 

Use of high-tech design (fluxgate) is crucial to the accurate measurement of small DC or AC current especially low offset drift conditions; measurable DC and AC current up to 18 kHz. CT products can be mounted on the PCB, small size, light weight, with the phase conductor through the through hole. Mounted on the PCB CAS / CASR / CKSR current sensor using the same closed-loop fluxgate technology; isolated measurement of AC and DC current, they cover the range of 6 to 50Arms rated highest measured three times the rated value, frequency up to 300 kHz (+ /-3dB). 

Specially designed in accordance with the requirements of the latest the mppt charge controller design trends, they improved the performance of the following aspects: common mode interference, temperature drift (offset and gain; depending on the model, the the largest zero temperature drift of 7 to 30 ppm / K), the response time (less than 0.3 microseconds), the insulation level, the +5 volt supply and compact size. 
In order to synchronize with the grid, require special control of the output terminal of the inverter. Must inverter output sinusoidal AC, to minimize harmonic respond quickly to the current changes to the network side. The sensors used here must have a fast reaction time and low 0:00 drift. 

Reduce the temperature changes caused by zero drift also help to reduce the need for complex compensation algorithms. In contrast, in the through sensors monitoring the DC input terminal of the wind charge controller of the MPPT, variations of the current corresponding to less, which can be used low-cost open-loop sensors. No access to the power grid inverter, such as a rechargeable battery backup system, free from the national grid, but must meet the same safety and efficiency requirements. 

PV inverter design must comply with the specifications are likely to become more stringent. Example, and limitations of DC input power grid may reach some kind of consensus on the total allowable level of the output current of the inverter harmonics; according to the layout of the existing features a variety of local restrictions. This requires to accurately measure current in the grid frequency is much higher than 50 or 60 hertz. 

Close collaboration between Lyme and other sensor manufacturers and PV inverter manufacturers, technology development will lay the foundation. The integrated use of these technologies to achieve real competitive advantage and market share in the growing solar energy industry.