Avec l'industrie solaire photovoltaïque en plein essor, De plus en plus de gens utilisent des systèmes solaires chez eux, ou des articles à énergie solaire dans la vie quotidienne, comme des radiateurs à énergie solaire, Lumières de jardin solaires, etc..
Parfois, Les gens se concentreront sur la qualité du panneau solaire car ils veulent plus d'éclairage la nuit, car un meilleur panneau solaire permet plus d'énergie stockée dans les batteries, ce qui peut assurer un temps durable.
Il est bien connu que la puissance du panneau solaire est un facteur vital pour décider de la qualité du panneau solaire. La puissance est plus élevée, Le courant de travail est plus élevé, l'efficacité de charge est meilleure. La plupart des gens choisissent des panneaux solaires en comparant la puissance du panneau solaire.
Cependant, Si nous creusons à l'intérieur de la caractéristique de décharge du panneau solaire, Nous constaterons que l'énergie solaire est l'un des facteurs qui affectent la qualité du panneau solaire, mais pas le seul.
Voici un exemple:
Supposons que nous avons deux panneaux solaires A & B, Ils sont tous avec la tension 6V, Power 30W, théoriquement leurs performances de charge sont les mêmes. Mais est-ce correct?
Basé sur un algorithme idéal, dans un jour de la journée standard, Le courant de sortie nominal est i = 30w / 6v = 5a. Cependant, Il n'obtiendra jamais un courant de 5A constant toute la journée.
In practical application, due to the various kinds of geographical environment and weather conditions, there is almost no theoretical sunshine. Sometimes it rains, sometimes it has too many clouds in the sky, the sunshine change between weak or strong. As a result, the solar panel works in an unconventional environment 80% of the daytime probably, especially during dusk and dawn.
Now you may understand that it is meaningless to focus on the theoretical calculation formula, as the output current you calculate requires stable sunshine all the time, but it won’t happen even a day. Most of the time the solar panel receives weak sunshine and is hard to reach the rated output current.
Ainsi, the most important factor we always ignore is the low light performance of the solar panel, which decides how the solar panel works under weak sunshine.
What is the low light performance for the solar panel?
Low light performance, or low light efficiency of the solar panel, is the discharging efficiency of the solar panel during low light conditions.
Quoted from the academic sites:
“The low light performance/behavior of a solar panel is mainly dependent on the shunt resistance and series resistance of the cells.”
During low light condition, the solar panel discharging perfomance ensure the lowest value of the solar system charging, we can say it as a basement of the solar panel quality.
How can I know a solar panel’s low light performance is good or not?
Unfortunately, the testing of solar panel low light performance is difficult, it requires specific professional equipment, many factories or manufacturers don’t even have this testing ability.
Cependant, we consumers can still have a way to compare the low light performance of solar panels by doing simple testing.
Assume you have two solar panels from different suppliers, the solar panels have the same power, same voltage, etc.. Of course, you need to confirm the battery spec is also the same, it means these solar panels have the same system solution. Make them work under the sun during dawn, noon, and dusk, test and check the output current and working power respectively, then you can have the result that which solar panel has the better low light performance.
There will be no big difference during sunny days, but when it comes to rainy days or cloudy days, the low light performance will make big difference.
Welcome to contact us if any questions about this topic.
