Residents install photovoltaic power plants based on two reasons: First, the spirit level for environmental protection and energy conservation, governance haze weather, improve air quality. Second, the material level For investment income, taking Shanghai as an example, for the residents with large electricity consumption, 4-6 years can recover costs, 25 years of annual income up to 14%, investment income exceeds any of a bank's wealth management products.
However, the premise is that the photovoltaic power station will not cause damage to the residents' property and people. The residents' power stations and commercial power stations are different, and the residents' power stations are not operated and maintained by professionals. If a residential power station uses a string inverter, there will be a DC high voltage on the line (20 modules will form a 600V DC high voltage). During the 25-year operation period of the power station, due to aging of the adapter, arcing may cause fire or Electric leakage hurts people. Using micro-inverter technology, the components are all in parallel, and the DC side is 3OV low voltage, so the safety is guaranteed.
Second, the photovoltaic power plant is a product that has a 25-year return. Residents benefit from 25 years of power generation. It is very important to ensure that the system generates normal power. In 25 years, the power loss of individual components will be low or invalid due to inconsistent component attenuation, hot spots, PID effects, bird droppings, and the like.
In a system using string inverters, the power generation of one module will be greatly reduced because of the serial relationship between each module. For residents who do not have professional knowledge, problems cannot be discovered in time, which will greatly reduce the residents’ investment income. With micro-inverter technology, each component is connected in parallel, and the power generation or failure of individual components will not affect other components. It can ensure the normal power generation of the system.
The impact of low individual component power generation on the output of string inverters and micro-inverter systems:
Thirdly, after the construction of the residential PV power station, the EPC shall bear a maximum of 5 years of warranty. In the long operation afterwards, the user will need to maintain it himself. For the string inverter system, it is difficult for the residents to discover because each component cannot be monitored. Component failures, if the inverter fails, residents need professional service. For the micro-inverter system, the user can monitor the power generation of each component at any time in real time through the EMA platform. Once a failure is found, residents can replace the failed component by themselves, or they can not replace it, because in this system, individual components The failure will not affect the normal operation of other components.
EMA monitoring platform
When residents build photovoltaic power plants, the above three issues (safety, power generation protection, and easy maintenance) must be considered and solutions must be provided. Personally think that in the construction of residential PV power plants, micro-inverters have great advantages, but at present micro-inverters do not have advantages in price to string inverters. Some mid- and high-end users will use micro-inverters at any time. With the decline of micro-reverse prices, micro-inverters will dominate the residential market.
Oushida is second quality machine,but the quality also similar with longneng quality.only different is the Motor material. Longneng is 45# baosteel cold-rolled.Oushida is 60# cold-rolled baosteel.608 bearing use C&U.another one is scnc, another is CHL.
We have self machinery room to control the aluminium allowable error.We also removal the dust that every process machining to control no more tolerance on the spare.
There is testing room to control the quality stable.
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Yongkang Longneng Power Tools CO., LTD. , http://www.longnengtool.com