2018 National Development and Reform Commission issued a new photovoltaic subsidy policy, the benchmark feed-in tariff decreased significantly, the rate of return on investment decreased, distributed PV subsidies from 0.42 yuan / kWh to 0.37 yuan / kWh, lower than expected rate, and a lot of component prices, From the year of 2015, the subsidy is about 4 yuan / W, the system cost is about 7-8 yuan / W, and the component price is about 2.8 yuan / W by 2018. The system cost is about 5-6 yuan / W, so in 2018 Compared with the 2015 investment household distributed power station more cost-effective, photovoltaic power generation will be more and more into the average family.
The main function of the inverter is to convert the DC power generated by the PV modules into AC power. Since the inverter is the only 'smart' device in the PV system, in addition, the inverter also undertakes the operation of test components, power grids and cables Status, and communication with the outside world, system security steward and other important functions.So, household inverter selection should pay attention to what?
1 Configure a safe and reliable DC switch
Household power station situation is very complicated, the location is relatively remote, once the components short-circuit ground and other phenomena, the sale can not be rushed to the scene, there may be a fire or electric shock, then the owner can disconnect the DC switch (this operation is very simple) Avoid further escalation of the problem.
2 to minimize the noise
Household photovoltaic inverter installed in the residents home, if the operation of the noise, will bring great inconvenience to people's lives, the inverter's voice comes from fans and inductors, inverters to be fanless design, There is no fan inside or outside, eliminating the largest noise source; the overall plastic irrigation plastic, and placed in a separate aluminum enclosure, reducing the inductor current and vibration sound.
3 to take a variety of display
Both have LCD display, intuitive and convenient, suitable for some users do not have a smart phone to view the physical keys short life, voice-activated button operation is simple, longer life; using GPRS monitoring methods, using smart phones to monitor power plant operation, anytime, anywhere View, you can manage thousands or even tens of thousands of unified power plant, two-way monitoring system can provide proactive services, identify problems, failure warning, problem remote diagnosis and processing functions.
4 high power generation
Inverter affect the power generation of many factors, first of all inverter to be stable, can not be bad, because once the inverter fails to repair machine or replacement, at least two or three days, as many as five or six days, during which the loss of electricity The second is the efficiency of the inverter, the three inverter efficiency, maximum efficiency, weighted efficiency and MPPT efficiency, the greatest impact on the power generation is the weighted integrated efficiency, because the inverter is operating below the rated power Time is the most .Third, DC voltage range, the voltage range is wider, on behalf of the early start night stop, power generation time is long, the higher the power generation. Fourth, MPPT tracking technology to high precision, dynamic response speed, to adapt to light Rapid change, improve power generation efficiency. Fifth, the inverter output voltage range should also be wide, the best can reach between 180-270V, of course, can not be too high, more than 270V will have an impact on household appliances.
5 kinds of operation and maintenance methods combined
Photovoltaic in the country or a new life, but also not fully mature, a combination of multiple operation and maintenance methods, minimize operation and maintenance time is very important, the current operation and maintenance methods are several, one is the remote operation and maintenance, equipment manufacturers through remote diagnosis System failure, analyze and determine the reasons, find solutions to guide owners, installers to solve the problem or remotely upgrade software, this method is the fastest, high requirements for operation and maintenance software and hardware, bidirectional control, faster. Second is On-site operation and maintenance, the remote can not solve the problem, after the sale of equipment manufacturers to the scene, the equipment manufacturers after-sales staff strong technical force, after-sales service and more, preferably in the local full-time staff.
