Ac Solar Modules & Microinverters 1

Ac Solar Modules & Microinverters 1

The overall output power of the solar cell panel is greatly reduced, mainly because of some module damage (hail, wind pressure, wind vibration, snow pressure, lightning strike), local shadows, dirt, tilt Angle, orientation, different degrees of aging, small cracks... These problems will cause system configuration misalignment, resulting in reduced output efficiency defects, which are difficult to overcome traditional centralized inverters. Solar power generation cost ratio: module (40 ~ 50%), construction (20 ~ 30%), inverter (<10%), from the point of view of the cost proportion, the construction cost is as high as 1/3, if the inverter is directly installed on the module in production, the overall power generation cost can be greatly reduced.

In order to overcome such problems, in 2008 developed a microinverter (microinverter) applied to the solar module, that is, each DC solar module is equipped with a direct conversion of direct current (DC) to AC (AC) small inverter, it can be directly installed behind the module or fixed frame, Through the micro inverter tracking, each module can operate at more than 95% of the highest power point (system more than 99.5% of the time is normal operation), such an advantage is for each module to optimize the output power, so that the entire solar power system output power to obtain the highest, for the design architecture, Even if some modules are covered by shadows, heat, dust... In addition, its power transmission value is connected to AC power supply, do not need complex and professional series and parallel, direct parallel output, can also reduce the attenuation between power transmission, recent research shows that the module assembly micro-inverter can increase the energy collection by 20%, a single module provides standard AC frequency power supply, Each module has arc protection, which can reduce the probability of arc occurrence. It can be seen that the failure rate of the centralized inverter is high, it must be replaced often, and its life is only about half of the module, if we use the micro inverter its output power is lower, it can improve the service life of the inverter.

Since each module is behind the small inverter, the module does not need to configure another communication wire, can directly through the output wire of the AC Power supply, direct network communication, only need to install a power line network Bridge (Power line Ethernet Bridge) on the socket, do not need to set up another communication line, Users can directly access the web, iPhone, blackberry, tablet... Etc., watch the operation status of each module (power output, module temperature, fault message, module identification code), if there is an anomaly, it can be repaired or replaced immediately, so that the entire solar power system can operate smoothly.

Output terminal of AC module:

AC output, DC output, Control Interface

Ac solar module English name:

AC solar PV module ac pv module AC photovoltaic module AC Module PV systems composed of AC modules AC module-composed  PVAC Module

Proprietary abbreviation:

CVCF: constant voltage, constant frequency

EIA(Energy Information Administration) The United States Energy Information Administration

EMC: includes EMI(Electromagnetic interference) and EMS(electromagnetic tolerance) two parts

EMI(Electromagnetic interference) : The electromagnetic noise generated by the machine itself in the process of performing the intended function is not conducive to other systems

ETL: Electronic Testing Laboratory

MFGR: Manufacturer

HALT: Highly Accelerated Life Test. Halt: highly accelerated life test

HAST(Highly Accelerated Stress Test) : Accelerated stress test

HFRE: high frequency rectifier

HFTR: high frequency transformer

MEOST[Multiple Environment Over Stress Tests] : MEOST[multiple environment over stress tests]

MIC(microinverter) : A microinverter

Micro-inverters: indicates micro-inverters

MPPT[Maximum Power Point Tracking] : indicates maximum power point tracking

MTBF: mean time between failures

NEC: National Electrical Code

PVAC Module: AC solar module

VVVF: Change voltage, change frequency