PV industry has come winter , the various manufacturers of photovoltaic industry chain struggled desperately to cut costs in order to be more ruthless price customers will be required , as the PV inverter industry chain most technical content of days Jiaozi - PV grid-connected inverter , also spared , 500KW grid inverter price, from today's 0.5 yuan per watt in 2009 dropped to 2.0 yuan per watt inverter manufacturers in lower profits at the same time , alternative photovoltaic inverter also more expensive components or even cancel conducted to ensure that the whole of the price drop.

However, due to the special status of PV inverters in photovoltaic power plants , some inverter manufacturers cost reduction measures have seriously jeopardized the entire industry. Because in photovoltaic power plants , the cost of the inverter is less than 10 % loss accounts for more than 80 % to 90% power generation efficiency of photovoltaic power plants controlled by the inverter, inverter assessment methods can not rely on the price , the more important the inverter is to look at the actual generation capacity.

Now the domestic production of inverters up to 300 manufacturers , ultimately left 10 influential manufacturers will come home in the end what companies will ultimately survive , which companies will be the first out , I think: just keep going back to the product quality route, sense of social responsibility , moral bottom line, companies have continued to improve capacity is the ultimate winner. I engaged in photovoltaic inverter design more than five years , from the perspective of a systems engineer , to tell you some bad Revealed manufacturers reduce costs insider.

MPPT efficiency mystery , in the photovoltaic inverter specifications book, most manufacturers have MPPT efficiency of this indicator, some marked as 99% , some even labeled as 99.9%, MPPT efficiency is currently no reliable instrument to measure , do not require certification measurements , in fact , MPPT efficiency is the most critical factor in the decision PV inverter generation , far more than the importance of the efficiency of the PV inverter DC TO AC itself , domestic PV inverters are under the same conditions as Comparative generating capacity , may differ up to 20% of this difference is mainly due to MPPT efficiency.

There MPPT students can first understand the basic principles and implementation methods Baidu MPPT 's . I mainly to everyone Revealed MPPT efficiency calculation methods and sources , MPPT efficiency equal hardware efficiency multiplied by the efficiency of software and hardware efficiency mainly by the accuracy of the current sensor to determine the accuracy of the sampling circuit , the software efficiency is mainly determined by the sampling frequency , there are many ways to achieve MPPT , but no matter which method is used , the first to measure the components of the power of change, and then react to changes . This is one of the most critical components is the current sensor , its accuracy and linearity errors will directly determine the efficiency of the hardware , software and sampling frequency accuracy by hardware also determined .