1. No, solar cell modules are connected in series and parallel and then packaged to form a solar panel. The panels are then connected according to actual needs, and rectifiers, inverters, etc. are installed. are added to form a photovoltaic energy production system.
2. If you want to buy solar panels, you must first determine your electricity demand, because solar cells are calculated based on quantity per wp (some companies simplify it by saying how much per panel, but in reality it is calculated by wp).
After determining your needs, you should also consider the battery technology you want to use. Monocrystalline, polycrystalline and amorphous silicon solar cells have different efficiencies and prices. The more expensive it is, the lower the efficiency will be and the installation space will of course be larger.
When you determinethe needs and the technology to use, you can calculate them according to your local sunshine conditions (here psh:peak
sunshine
time), it depends on the service data local weather forecast. Consider temperature, dust, manufacturing, and overall power generation system losses to determine how many panels you say you need to purchase.
The general standard for solar panels is a series connection of 3*12 batteries. The voltage is usually around 20V/panel and the current is around 2A. These manufacturers can also scale the battery up or down depending on your. needs.
The important parameters of solar panels are: open circuit voltage voc, short circuit current isc, peak voltage vmp, peak current imp and noct (normal cell
< p >operating temperature) The operating temperatureof the solar cell. Based on this, you can judge the quality of the battery panels.
3. What type of battery panel is best?
In terms of technology, silicon-based solar cell technology is currently the most mature.
Technically speaking, it is of course monocrystalline silicon, because the efficiency is high enough.
In terms of price and payback time, amorphous silicon is also very competitive.
According to manufacturers, Wuxi Suntech and Nanjing Zhongdian are the biggest in China, bpsolar, unisolar and sunpower are all pretty good.
1. The possibility that "the solar panel produces a voltage of 4~8V and is rectified to 5V2A" is very small: (8V) When the solar panel produces a voltage of 4V, the light intensity is already very low, and then the voltage increases, it is very difficult to maintain a current of 2 A.
2. Even if you charg the battery, it should be higher than the battery voltage. If the output voltage of the solar panel is low, the current will definitely decrease and it is almost impossible to boost and recharge again (boost and inverter efficiency should be considered). Unless your solar panels are very, very, very powerful!