How many years do solar cells last?
The service life of solar panels is determined by the battery sheet, tempered glass, EVA, TPT and other materials, generally will use a good bit of material manufacturers to do out of the panel service life can be up to 25 years, but with the impact of the environment, solar panels will be the material of the time changes and aging. Generally with 20 years of power will decay 30%, with 25 years of power will decay 70%.
The structural composition of solar cells:
(1) the role of tempered glass to protect the main body of power generation (such as battery cells), the selection of its light transmission is required, 1. Transmission must be high (generally 91% or more); 2. Ultra-white toughened processing
(2) EVA is used to bond fixed tempered glass and power generation body (such as battery cells), transparent EVA material advantages and disadvantages directly affect the life of the component, exposed to the air in the EVA easy to aging yellowing, thus affecting the light transmittance of the component, thus affecting the quality of the component power generation In addition to the quality of the EVA itself, the component manufacturers of the laminating process is also very large, such as the EVA adhesive linkage degree of substandard EVA, EVA and tempered glass, backplane bonding, and the backplane. Such as EVA adhesive degree is not up to standard, EVA and tempered glass, backplane bonding strength is not enough, will cause EVA early aging, affecting the component life.
(3) The main role of the battery is to generate electricity, the main body of power generation in the market is the mainstream of crystalline silicon solar cells, thin-film solar cells, both have their own advantages and disadvantages. Crystalline silicon solar cells, equipment costs are relatively low, but consumption and battery cost is very high, but the photoelectric conversion efficiency is also high, in the outdoor sunlight power generation is more appropriate; thin film solar cells, relatively high equipment costs, but consumption and battery costs are very low, but the photoelectric conversion efficiency relative to the crystalline silicon cell more than half a point, but the low light effect is very good, in the ordinary light can also generate electricity, such as the calculator on the Solar cells.
(4) EVA role as above, the main bonding encapsulation of power generation body and backplane
(5) the role of the backplane, sealing, insulation, waterproof (generally use TPT, TPE and other materials must be ageing-resistant, most component manufacturers are guaranteed for 25 years, tempered glass, aluminum alloy is generally not a problem, the key is with the backplane and whether the silicone can meet the requirements.)
(6) Aluminum alloy protective laminates, play a certain role in sealing and support
(7) junction box to protect the entire power generation system, play the role of the current transfer station, if the component short circuit junction box automatically disconnect the short circuit battery string, to prevent burning the entire system. The most critical thing in the junction box is the selection of diodes, according to the different types of battery cells in the component, the corresponding diodes are different.
(8) Silicone sealing effect, used to seal components and aluminum alloy frame, components and junction box junction. Some companies use double-sided tape, foam to replace the silicone, the domestic commonly used silicone, simple process, convenient, easy to operate, and the cost is very low.
Solar panels generally have a nominal life span of 20 years or more, which of course requires that the materials and workmanship of the panels meet the requirements.
If you want to use battery-powered heating is not very realistic, just imagine, so large rooms with air conditioning heating are about 10 horsepower, to switch to battery-powered, it is estimated that you have to use a minimum of 10 square meters of room to put the battery!
Regular solar panels theoretical life of 20 to 25 years, but the actual life may not be. The life expectancy of those miscellaneous products labeled in English on Taobao is hard to say! A few months bad are possible.
As you say to use solar heating is very very unreliable, first of all, solar panels photoelectric conversion rate is super low, even if the panels cover your entire roof and walls are not enough to give 120 square meters of room heating. The total cost of the initial installation of batteries, panels and ancillary equipment is enough to cover your electricity bill for decades. Batteries last only 2 to 3 years before they have to be replaced and are expensive.
Solar batteries last about ten years and are easy to replace.