There are increasing people using solar power generation system at present. After using solar power system, they find that the daily power generation does not meet anticipation in their mind. For example, some people install 3KW solar panels, but only produces 5 to 6KW/H a day and some even lower. However, some of their machines can produce as much as 20KW/H every day. Why? Who stole my electricity?
Generally speaking, there are the follow aspects:
- PV module efficiency
- Charge controller efficiency
- The voltage of wire decreases
- Loss and attenuation of storage battery
- Inverter efficiency
Ⅰ.PV module efficiency
The efficiency of PV modules has always been a topic of concern to everyone, but what is the relationship between the efficiency of PV modules and our actual power generation? Lots of people don’t know, now I am going to make a brief introduction. PV module efficiency refers to the power generation of PV modules per unit area. According to current efficiency, an area of 1 square meter can generate 200W of electricity when the installation and orientation are correct. At present, the largest size module is 1950*995 MM, and the Max power can be over 400W. The generating capacity of PV module will slowly decay with time. That is to say, the longer it takes, the lower the power of PV modules. Generally, after using 20 years, solar panels can still maintain 85% of the power generation, which is pretty good.
Is it true that the higher efficiency solar panels we use, the more power will be generated?
No, the higher efficiency of solar panels, the smaller area needed for installation. If the installation area is large enough, we can choose solar panels with higher cost performance.