Solar rack installation system – installation drawing of solar heating system

“< H2 > what elements should be paid attention to when installing the support of the balcony wall mounted solar water heating system

1. Each set of flat plate is equipped with two sets of supports. Each set of support is composed of one rear support, one front support, one oblique support, two pressure blocks, three sets of long screws and three sets of short screws

2. When determining the position of the expansion bolt of the fixed support, make the support 25 ~ 30cm away from the edges of both ends of the flat plate, and the expansion bolt on one side of the flat plate pipe head is 2 ~ 3cm higher than the other side

Installation method of photovoltaic power generation support

(1) The bracket is installed in the bracket installation mode. The battery module is supported by a metal frame and presents a preset inclination. Fix the bracket on the roof with screws. This installation method will bring problems such as increasing roof load-bearing and wind stress. However, since the airflow path completely surrounds the battery module, the module can maintain a relatively low operating temperature, thereby improving efficiency. Some bracket installation methods can adjust the inclination angle according to season to improve the efficiency of photovoltaic system. (2) Installation method: install the battery module on the frame on the roof, which is parallel to the inclination of the roof and 10 ~ 20cm high from the roof. The supporting cross bars are fixed on the frame of the, and the components are fixed on these cross bars. The installation method provides a path for the free flow of air for the square array. The disadvantage of the installation method is that it is difficult to maintain the square array and replace the roof materials. (3) Direct installation the direct installation method installs the battery module directly on the cover of the ordinary roof, so there is no need to support the frame and cross bar. The components must maintain the integrity of the roof covering seal, so they must be approved

What are the steps to install the TV stand

If the ordinary brick wall needs to install the LCD TV rack, you only need to drill holes on the wall with an impact drill, then plug in the plastic expansion pipe, and finally fix the LCD TV rack with screws to hang the LCD TV.

5。 If it is a board wall, you need to first select the positioning of the LCD TV hanger, first use the art knife to punch a small hole at the fixed position, and then put a 2cm thick long wooden strip on the LCD TV hanger to make the self tapping screw pass through the gypsum board and enter the wooden strip during self tapping, so as to increase the stress area

What should be paid attention to when installing components in household solar power generation system

When installing components, because some components are fragile, they need to be handled with care to avoid impact. When installing batteries, controllers, inverters and other items, the positive and negative poles should be clearly separated and not connected reversely to avoid affecting the use. In addition, thermal insulation measures should be taken for batteries in winter to prevent the temperature of batteries from being too low, If the temperature of the battery is too low, it will affect the normal use of the solar power generation system, and the battery room should also maintain its ventilation and dryness. The whole room should be clean, tidy and moisture-proof

Solar system connection method

There are two questions about the problem:

1. Is your inverter 24V DC input? 24V 1000W 220V50Hz output

2. Is the controller 24V 20A? Instead of 20a 24W

If your inverter is 24V 1000W 220V50Hz output and the controller is 24V 20a, you can connect two 160W solar panels in parallel to the controller and two batteries in series to the controller

The inverter is generally equipped with low-voltage protection. The two batteries connected in series can be directly connected to the inverter without passing through the controller. If the low-voltage protection voltage of the inverter is greatly different from the low-voltage protection voltage at both ends of the battery, it is necessary to connect the DC output end of the controller with the DC input end of the inverter

24V bulb can be directly connected to the output of the controller

If the 500W kettle and 50W fan are 220V AC appliances, they are connected with the AC output end of the inverter

As for the three 15W panels, they can be used or not. They are only 45W in total. The connection does not play a great role in the total power generation. Moreover, if the three panels are connected, they can only be connected in parallel, then connected in series with the other two 160W panels, and then connected in parallel with the other two 160W panels

Due to the voltage difference at both ends of different power panels, the total power after connection is not equal to 160 * 2 + 15 * 3 = 365w, but will be lower than 365w. After the actual connection of the next three 15W panels, the increased power will not be higher than 30W, chicken ribs! We might as well use the remaining three for other purposes

How do solar modules form a system in series

For solar cell modules, the output of each module has two wires, positive and negative. If it is an off grid system, it depends on the voltage of your system. The series or parallel connection depends on the working voltage of your system

For example, if the system voltage is 24V and the output voltage of each battery board is 17V, the battery boards need to be connected in series, and then the series battery boards formed by each two are connected in parallel. You should send your system configuration. I’ll give you a measurement of 10.4 temperature coefficient

10.4.1 purpose

Measure the current temperature coefficient from the component test( α)、 Voltage temperature coefficient( β) And peak power temperature coefficient( δ)。 The temperature coefficient thus measured is only valid under the irradiance used in the test; Refer to IEC 60904-10 for the evaluation of temperature coefficient of components under different irradiance

10.4.2 device

The following devices are required to control and measure the test conditions:

a) The light source (natural light or class B or better solar simulator conforming to IEC 904-9) to be used in subsequent tests

b) A standard photovoltaic device conforming to IEC 60904-2 or IEC 60904-6, whose short-circuit current and irradiance characteristics calibrated with the absolute radiometer are known

c) A device that can change the temperature of the test sample within the required temperature range

d) A suitable support makes the test sample and the standard device in the same plane perpendicular to the incident light

e) A device for monitoring the temperature of test samples and standard devices. It is required that the accuracy of temperature test is ± 1 ℃ and the repeatability is ± 0.5 ℃

f) The instrument for testing the current of the test sample and the standard device has an accuracy of ± 0.2% of the reading

10.4.3 procedure

There are two acceptable procedures for measuring the temperature coefficient procedure under natural light

a) The test can be carried out under natural light only when the following conditions are met:

– the total irradiance reaches at least the upper limit to be tested

– the irradiance change caused by instantaneous oscillation (cloud, mist or smoke) shall be less than 2% of the total irradiance measured by standard devices

– wind speed less than 2m? s-1。

b) Install the standard device and the test assembly in the same plane, so that the sunlight shines on them vertically (± 5 °), and connect them to the required equipment

Note: the tests described in the following clauses shall be completed within one or two hours of the same day as soon as possible to reduce the impact of spectral changes. If this is not possible, spectral correction may be required

c) If the test components and standard devices are equipped with temperature control devices, set the temperature to the required value

d) If there is no temperature control device, the test sample and standard device shall be shielded from the sun and wind until the temperature is uniform and the difference from the ambient temperature is within ± 1 ℃, or the test sample shall be allowed to reach a stable equilibrium temperature, or the test sample shall be cooled to a value lower than the required test temperature, and then the component shall be heated naturally. Before measurement, the temperature of the standard device shall be stabilized within ± 1 ℃ of its equilibrium temperature

e) Record the current voltage curve and temperature of the sample, and record the short-circuit current and temperature of the standard device at the test temperature. If necessary, the test can be carried out immediately after the shelter is removed

f) The irradiance G0 can be calculated from the short-circuit current (ISC) test value of standard photovoltaic devices according to GB / T 6495.4-1996, and corrected to the value under standard test conditions (IRC). Use standard device specific temperature coefficients( α RC) correct the standard device temperature Tm

Where α RC is the relevant temperature coefficient (1 / ℃) at 25 ℃ and 1000W / m2

g) Adjust the temperature of the component through the controller or alternately exposing and shielding the test component to make it reach and maintain the required temperature. The test component can also be heated naturally, such as the periodic application of the data recording program described in Clause d) in the heating process

h) During each group of data recording, ensure that the temperature of test components and standard devices is stable and its change is within ± 1 ℃; The change of irradiance measured by standard device is within ± 1%. All data records shall be at 1000 W / m2 or converted to the value of this irradiance

i) Repeat steps d) to h), the component temperature is within the temperature range of interest of at least 30 ℃, and there are at least four equal temperature intervals. Each test condition shall be tested at least three times program under solar simulator

a) Determine the short-circuit current of components at room temperature and required irradiance according to GB / T 6495.1

b) Install the test module in the equipment that changes the temperature, install the standard photovoltaic device into the simulator beam, and connect it to the instrument

c) Set the irradiance at the short-circuit current generated by the test component as determined in clause A). Use standard photovoltaic cells to maintain the irradiance at this level throughout the test

d) Heat or cool the component to a temperature of interest. Once the component reaches the required temperature, ISC, VOC and peak power are solar panel racking system measured. Repeat the measurement of ISC, VOC and peak power by changing the temperature of the component in a temperature step of about 5 ℃ over the temperature range of interest of at least 30 ℃

Note: complete current voltage characteristics can be measured at each temperature to determine the maximum operating point voltage and maximum operating point current varying with temperature calculation of temperature coefficient

a) Draw the function diagram of ISC, VOC, Pmax and temperature, construct the least square fitting curve, and make the curve pass through each set of data

b) The temperature coefficient of short-circuit current is calculated from the linear slope of current, voltage and peak power fitted by the least square method α, Open circuit voltage temperature coefficient β And maximum power temperature coefficient δ。

Note 1: determine whether the test component can be considered as a linear component according to IEC 60904-10

Note 2: the temperature coefficient measured by this procedure is only valid at the irradiance level tested. The relative temperature coefficient can be expressed as a percentage, which is equal to the calculated value α,β and δ Divided by current, voltage and maximum power at 25 ℃

Note 3: since the filling factor of the component is a function of temperature, use α and β The product of is not sufficient to represent the temperature coefficient of maximum power