In 2018, the National Development and Reform Commission issued a new PV subsidy policy. The benchmark on-grid tariff was lowered significantly and the return on investment was reduced. The distributed PV subsidy was lowered from 0.42 yuan/kWh to 0.37 yuan/kWh, which was lower than expected, while the module price dropped drastically. From the first year of electric subsidies in 2015, the module price is about 4 yuan/W, the system cost is about 7-8 yuan/W, the module price is about 2.8 yuan/W by 2018, and the system cost is about 5-6 yuan/W, so 2018 It is more cost-effective to invest in distributed power plants than in 2015, and more and more photovoltaic power generation will enter the average family.
The main function of the inverter is to convert the DC power from the PV modules into AC power. Because the inverter is the only device with “wisdom†in the PV system, in addition, the inverter also carries the test components, power grid, and cable operation. State, communication with the outside world, system security, housekeeping, and other important functions. Then, what should pay attention to the selection of household inverters?
1 Configure a safe and reliable DC switch
The situation of household power stations is very complex and their locations are relatively remote. Once the components are short-circuited and grounded, they cannot be reached immediately after the sale, and there is a risk of fire or electric shock. This allows the owner to disconnect the DC switch (this operation is very simple). Avoid further upgrades.
2 Minimize noise
Household PV inverters are installed in residents' homes. If noise is generated during operation, it will cause great inconvenience to people's lives. The sound of inverters comes from fans and inductors, and the inverters are fanless. There is no fan inside and outside to eliminate the largest source of noise; the entire inductor is potted and put into a separate aluminum case to reduce the current and vibration of the inductor.
3 take a variety of display methods
Need to have LCD display, intuitive and convenient, suitable for some users without a smart phone to view, physical button life is short, voice-activated button operation is simple, longer life; using GPRS monitoring, using smart phones to monitor power station operation, can be anywhere, anytime Viewing can manage thousands or even tens of thousands of power stations in a unified way. The two-way monitoring system can provide active services, discover problems, early warning of faults, and remote diagnosis and processing of problems.
4 high power generation
There are many factors that affect the power generation of the inverter. The first is that the inverter must be stable and cannot be damaged because once the inverter is faulty, repair or replacement is required. The frequency is as low as two or three days, and as many as five or six days. During this period, electricity costs are lost. Great. The second is the efficiency of the inverter, the three efficiency of the inverter, the maximum efficiency, the weighted efficiency, and the MPPT efficiency. The weighted total efficiency is the one that has the greatest impact on the power generation because the inverter operates at a time lower than the rated power. of. The third is the DC operating voltage range. The wider the voltage range, it represents the early start-up and late-stop, and the longer the power generation, the higher the power generation. Fourth, MPPT tracking technology has high accuracy, fast dynamic response, can adapt to rapid changes in light, and increase power generation efficiency. Fifth, the inverter output voltage range should also be wide, it is best to achieve between 180-270V, of course, can not be too high, more than 270V will have an impact on home appliances.
Combination of 5 kinds of operation and maintenance methods
PV is a new thing in China, but it is still not fully mature. It is very important to reduce the operation and maintenance time by combining multiple modes of operation and maintenance. There are several modes of operation and maintenance at present. One is remote operation and maintenance, and the equipment manufacturer conducts remote diagnosis. System failures, analysis and judgment of causes, find solutions, and guide owners and installers to solve or remotely upgrade software problems on-site. This method is the fastest, has high requirements for O&M software and hardware, and can control in both directions, and is faster. The second is on-site operation and maintenance. In the event that the problem cannot be solved remotely, the equipment manufacturers will send the product to the site after sale. This equipment manufacturer has strong technical strength and many after-sales service points for after-sales personnel. It is best to have full-time personnel in the local area.
About high speed Door Accessories:
1.Driving system: High Speed Door Servo System motor and control, motor SNMA / SEJ +reducer+flang+encoder+control box
2.Other accessories: Middle aluminium bar, bottom aluminium bar, aluminium vertical track, stainless steel vertical track, brushes,round nylon strip, PVC roll, rolling steel tube complete, drum be;;s for rolling tube, side end covers, stainless steel cover, steel tubes, air bag sensor system, safety light beam, Microwave sensor 24 Gigahertz,PVC welding machine, smoke and fire sensors, PVC transparent window, magnetic loop, photocell, remote control, manual push button, sound warning alarm Led lamp traffic light
For some main accessories, here is detain introduction:
1).24G radar sensor:
Brand: Hofic
Technology: Microwave processor
Maintain time: 0.5s
Protection: IP54
Transmitting frequency: 24.125GHz
Maximum installation height: <5meter
Transmitting power density: <5mw/cm2
Power consumption: <1W(VA)
Installation angle: 0-90°(lengthways) -30-30°(crosswise)
Supply voltage: AC&DC 12V-30V
2).Photocell:
Approval CE & ISO9001
Power supply AC/DC 12-30V
Static current 25A
Action current 40mA
Mounting distance Max 10m
NO or NC contact Done by NO./NC. contact selection
Working environment temperature -42℃ to +45℃
Working environment humidity 10 to 90%RH
Appearance dimensions( controller) 123*50*32mm(L*W*H)
Appearance dimensions(Magic eye head) 19*13mm(L*D)
3). Remote control
Operating Voltage: AC220V/50HZ+-20%
Transmit power:≤100mW;Super regenerative module, strong anti-interference
Operating temperature:-30℃-+70℃
Working frequency: 433MHZ;transmitter 1527, millions of encoding chip
Accept sensitivity:≤110dB
Manipulation method: electric remote control
Configure the quantity: Wireless number; factory configuration transmitter two. Can be equipped with PT2272 digital decoder chip
Configure the function: Up, down, stop, anti-lock full-featured reproduction
4). Magnetic loop
Voltage: 12V AC/DC +-10% 24V 115V AC+-10% 230V
Power: <2VA
Continued electrical output: 7A / 250V AC
Frequency range: 20 to 200K Hz
Response time: infinity (factory setting) or adjust maintain time
Sensitivity: 0.01% to 0.1% divided into 3 levels
Protection level: IP30
Electromagnetic compatibility (EMC) Complies with EM50081-1 and EN50082-2
Detection loop inductance: the limit of 40uH to 100uH ideal value 80uH to 300uH
Operating temperature: -25 ℃ to 70 ℃
Storage temperature: -40 ℃ to 85 ℃
Relative humidity: <90% non-condensing
Temperature compensation: automatic compensation up to 50 ℃ / h
Connection type: 11 pin DIN rail socket
Dimensions: 41 * 78 * 85 mm (width * height * length)
Weight: 250 grams
5). manual push button
This exit switch button is made of ABS and has built-in indicator light make it looks more elegant and fashionbale. It can be widely used in public entrance gates, public door, home, office, hotel, etc.
Door Exit Button Push To Exit Switch Door Opener For Access Control Security
Main Feature
Fashionable appearance
Made of ABS Plastic
Easy to install and operate
Used for access control
Specification
Mechanical Life: 500,000 test
Material: Plastic
6). Limit switch encoder
Voltage: DC5V-24V
Output voltage: high voltage≥85%Vcc, low voltage≤0.5V
Maximum mechanical speed:6000rpm
Anti-vibration: 50m/s,10-200HZ,XYZeach way 2 times.
Current consumption:≤30mA
Response frequency: 0-100KHZ
Protection: waterproof,oil proof,dust prevention, IP54
The output code system: binary code
Operating life: MTBF≥30000(+25℃,2000rpm)
Rotational inertia:4.0x10-8kgm²
Maximum load:radial direction20N
Axial direction:10N
Weight: about 0.4kg
High Speed Door Accessories,High Speed Door,Electronic High Speed Door Accessories
Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hfhighspeeddoor.com