Improve the energy yield of home solar system components and choose inverter?

Published by Xianghong February 19,2024


Tips for generating energy from home solar system components


home solar system components


1. Orientation selection of photovoltaic solar panels


The orientation of photovoltaic solar panels is usually chosen around the south direction to maximize the power generation per unit capacity of the solar power generation system. The best efficiency is within 20° to the southwest. Pay attention to the influence of the surrounding environment and buildings. If the environment permits, it should be as far as possible 20° to the southwest.
After choosing the location, the next thing to do is to choose the angle of inclination. Most solar panel angles are about 45 degrees. This is determined by the local latitude, because the angle of sunlight at different latitudes is also different. Not the same, from a professional point of view, you can use a computer to accurately calculate a value based on the local latitude, so that the power generation efficiency can achieve the ideal goal


30kw solar system


2. Reduce the loss of solar cable lines


For performance and safety reasons, it is important to select the correct PV wire size for your solar system. If the photovoltaic wire is undersized, a significant voltage drop will occur in the photovoltaic wire, resulting in excessive power loss. Also, if the PV wires are undersized, the PV wires may heat up to a point that could cause a fire
The PV wires from the charge controller to the battery pack can often be the same size or larger than the main wires of the PV array. The exception is charge controllers that are of the type that can run a 12 or 24 volt battery bank, even if the PV array is running at a higher voltage, such as 48VDC or higher. These charge controllers have large transformers that step down the voltage, but in the process, they increase the current flow to the battery pack. Refer to your charge controller's installation instructions when selecting the correct PV wire size to use.


3. Solar module efficiency and quality


Calculation method: Theoretical power generation = annual solar radiation x installed capacity x system efficiency

There are two factors here, the battery area and the photoelectric conversion efficiency. The conversion efficiency here has a direct impact on the power generation of the power station.

Component collocation loss

The series connection will cause current loss due to the component current difference, and the parallel connection will cause voltage loss due to the component voltage difference. Loss will reach more than 8%.

Ensure good ventilation of components

According to the data, if the temperature rises by 1°C, the power of crystalline silicon solar modules will drop by about 0.3%. Therefore, it is necessary to prevent the influence of temperature on power generation and maintain a better ventilation environment.

The loss of dust cannot be underestimated

The panel of the crystalline silicon module is tempered glass, and if it is exposed for a long time, organic matter and a large amount of dust will naturally accumulate. Dust on the surface blocks the light, which will reduce the output efficiency of the module and directly endanger the power generation.

In addition, it will cause the "hot spot" effect of the components, causing damage to the components. Rainwater can be cleaned without special maintenance. If you encounter adhesive dirt, you can simply clean it.



What should be paid attention to when choosing a solar inverter for a home solar system?


As we all know, after converting solar energy into electrical energy, it is not immediately possible to use it directly. This is mainly because the newly converted electric current is alternating current, while your household electrical appliances are direct current. If it is not processed, it cannot be used. At this time, the role of the solar inverter is revealed, so how to choose a solar inverter?


solar inverter


1. Equipped with a reliable DC switch:


The situation of the household system is relatively complicated, and the location is relatively remote. If there is a short circuit and grounding of the components, when the after-sales maintenance cannot be carried out immediately, it is likely to cause a fire or a safety accident. At this time, you can Allowing the user to disconnect the DC switch prevents further escalation of the fault.


2. Reduce noise:


Household solar inverters are installed in residential houses. If there is noise during operation, it will bring inconvenience to everyone's life. Most of the noise of the inverter comes from fans and inductors. The inverter should be selected Fanless design, there are no fans inside and outside, to eliminate noise sources as much as possible. The inductance is potted with glue as a whole and put into the aluminum casing independently to reduce the current and vibration of the inductance.


3. Multiple display methods are used:


when choosing a solar inverter, there must be an LCD display, which is intuitive and convenient. It is suitable for some customers who do not have a mobile phone to query real-time power generation. The physical function keys have a short life, and the voice-activated function keys are easy to operate and have a longer life long. Choose the monitoring method, use the mobile phone to monitor the operation of the power station, you can query at any time, and manage thousands or even tens of thousands of power stations in a unified manner. The two-way monitoring system can provide active services, problem discovery, fault warning, remote diagnosis and processing functions.


4. High power generation:


There are many factors that affect the power generation of solar inverters. The first is the stability of the inverter. Once the inverter is abnormal, it needs to be repaired or replaced. It takes three or four days at least, and one or two at most. Weekly, during this period, the electricity charge loss is very large; the second is the efficiency of the inverter, the efficiency of the three inverters, the greater efficiency, the weighted efficiency and the efficiency of MPPT, the weighted one has a greater impact on the power generation Comprehensive efficiency, because the inverter works at less than the rated power for the most time; the third is the DC operating voltage range, the wider the voltage range, it means early start and late stop, the longer the power generation time, the higher the power generation; Fourth, the precision of MPPT tracking technology should be high, and the dynamic response speed should be fast, which can meet the sharp change of light and improve the efficiency of power generation; fifth, the output voltage range of the inverter should also be wide, preferably between 180-270V, of course Can not be too high, exceeding 270V will affect household appliances.