SG3KTL / 4KTL / 5KTL is a transformerless inverter with higher
  efficiency. Its aluminum housing makes it very compact, robust and
  light in weight. The direct plug-in terminal port provides easy, safe
   and reliable cable connection under any circumstances. It can be
  used for string-connected outdoor small PV power station, or
  individually for a small house.

  SG50K3 is using low-frequency isolation transformer for protection
  purpose for indoor applications. It is the ideal product used for
  string-connected medium PV power station to simply PV power
   plant design.

  SG500K3 is using low-frequency isolation transformer for protective
  purpose. Its wider input voltage range ensures more combinations
  of the PV arrays. Moreover, optical fiber isolation technology has
   been adopted to increase its anti-interference ability under the
   circumstances of multiple inverters installation. In addition,
   optimized circuit and structural design has improved system
   thermal efficiency which enhancing system reliability and stability.
   Reinforced protection functions, including the DC ground fault
   protection, make it the best product for large scale PV power plant.

  For a large-scale grid-connected PV system, it is a general practice
  to install a DC combining device in between the PV modules and
  inverters for the sake of minimizing the cable distance between
  them, facilitating maintenance and improving reliability. With many
   years of PV grid-connected system design experience, our PVS PV
  array combiner box series is specially-designed for meeting the
   need of high performance and high reliability of PV systems. In
  combining with our Sun Access inverters, Sungrow PVS provides
  a turnkey solution for PV power plant systems. By using PV array
  combiner box, according to the input voltage of the inverter, Clients
  can connect a fixed number of similar PV modules to form a PV
  array. Then, different strings of pv array can be converged into the
  PV array string box. After that, together with lightning arresters and
  circuit breakers, it is connecting to the inverter to reduce the system
  installation time and increase the system safety.