The seven minefields of solar lamps and lanterns

First, the parameters of solar lamps and lanterns are seriously exaggerated.

Most solar lamps and lanterns sellers will carry out exaggerated parameter labels, especially solar street lights and projections. Lights marked power is often 100 watts, 200 watts, or even 500 watts, while the actual brightness of even a tenth can not reach.

The root cause of this chaos:

First, there is no unified national/industry standard for solar lamps and lanterns;
Second, there is no simple and direct power measurement tool. Even manufacturers based on the power controller parameters probably know the power of the lamps and lanterns; Third, everyone is on the exaggerated labels. Consumers only know that the higher the power, the brighter the power is. Not exaggerated labels products can not be sold, so only excessive label solar lights can sell well.

Not only solar lamps and lanterns, even the use of utility street lights to do an actual 300 watts, 500 watts there is a certain degree of difficulty, so the network above the 500 watts 600 watts of solar lamps and lanterns, look at it do not take it seriously! Even the current engineering-grade solar street lights can not reach this power!

The capacity of the battery limits the power of solar lamps and lanterns. The photovoltaic panels restrict the capacity of the battery. To do an actual brightness of 100 watts of solar lamps and lanterns and light only 8 hours to calculate, at least 3.7V ternary lithium battery 220AH and 6V photovoltaic panels 260 watts, which will require a very high price, technically challenging to achieve.

Second, photovoltaic panels and batteries must match.

Some manufacturers of solar lights marked 15A battery, but with 6V15W photovoltaic panels, which I find very speechless. 6V15W photovoltaic panels peak per hour can produce 2.5AH of electricity, and the average length of sunshine in China is 4.5H. Such a configuration is that 2.5AH photovoltaic panels 4.5 hours to a 15A battery full charge.

Some people may say that in addition to 4.5 hours, do not consider other times. After all, in addition to the peak 4.5 hours, other times can also produce electricity! Yes, there is nothing wrong with this statement.
First of all, in addition to the peak time at other times, the efficiency of electricity production is very low;
secondly, my peak capacity conversion here is calculated by 100% conversion. Photovoltaic power generation to battery charging, which can reach 80% of the conversion, is already Max efficiency. This is why your 10000mA rechargeable battery can not give 2000mA Apple phone charging 5 times. As for here is not calculated in such detail because we do not, as engineers in this area, do not need to calculate exact data.

Third, using monocrystalline silicon photovoltaic panels does not mean to be better than polycrystalline silicon.

Many businesses noted their solar lamps and lantern photovoltaic panels are made of monocrystalline silicon. They have high conversion efficiency, so the quality is better than polycrystalline silicon, which I can’t entirely agree with this.
Using this aspect of solar lamps and lanterns to measure photovoltaic panels is not reasonable. We should judge it by whether it can give the lamps and lanterns battery full charge. If the photovoltaic panels are 6V15W, this power produced per hour is 2.5A, which is too small for the power to charge the battery fully.

The monocrystalline silicon and polycrystalline silicon debate have always existed. Laboratory tests in monocrystalline silicon efficiency is indeed a little higher than polycrystalline silicon, but in the installed applications, they are not much difference.
In apply to solar lamps and lanterns, whether monocrystalline or polycrystalline, it will be good as long as you can use high-quality photovoltaic panels.

Fourth, photovoltaic panels must be installed in a place that can receive the maximum amount of sunlight.

Many customers buy solar lights because they are easy to install, do not need to pull the wire, and do not consider whether their environment is suitable for installing solar lamps and lanterns. Your installation location sunshine is less than 3 hours light. How can it be good to use?
Your photovoltaic panels and lamps wired more than 20 meters can blame the light power. How can the solar panel charge the battery fully?
The best wiring distance between photovoltaic panels and lamps is 5 meters. The longer the conversion wire, the lower efficiency.

The sun does not shine at noon when the sun is fiercest, which is not suitable for installing solar lamps and lanterns.

Solar photovoltaic panels must be installed in a certain place where the sunlight can shine to the maximum extent.
Solar photovoltaic panels must be installed where the sunlight can shine to the maximum extent.
Solar photovoltaic panels must be installed in a place where the sunlight can shine to the maximum extent.

V. Are the batteries new for solar lamps?

My place is the capital of lamps and lanterns, and there are all kinds of lights and lanterns accessories. I know the battery supplier to sell the battery are new energy vehicles dismantled batteries, whether ternary lithium or lithium iron phosphate batteries are dismantled batteries. The reason for this is: First, the new battery is expensive, and many manufacturers can not get it; Second, the new battery is supplied to new energy vehicles and other large customers, even if you have enough money but can not get it.

So are dismantled batteries durable? The answer is that dismantled batteries are also very long-lasting. The lights we sold three years ago are still working by our customers. Dismantled batteries have a set of perfect testing methods, as long as the strict screening can get a quality battery. Here the test is not the quality of the battery itself but human nature.

Sixth, the difference between ternary lithium batteries and lithium iron phosphate batteries.

We use a battery that is a ternary lithium battery and is also recommended the ternary lithium battery to our customers. The reason for not using lithium iron batteries is that it uses inert materials, making it not easy to detect good or bad quality; second, its low-temperature performance is much worse than ternary lithium.

The view here is that if the southern winter temperature is not below zero degrees, you can buy lithium iron batteries. Below zero degrees is not recommended to buy lithium iron solar lamps and lanterns, direct purchase of lithium ternary solar lamps and lanterns.

Seven, the more lamp beads, the higher the brightness?

More and more manufacturers are keen to make more and more lamps and lanterns because customers see so many lamps and lanterns, they will think that the lamps and lanterns have enough materials and good quality. The cost of lamps and lanterns is not too high anyway.

But it is not the beads but the batteries that maintain the brightness of the solar lamps and lanterns, how many watts of power the batteries can provide to the lamps and lanterns, and how many watts of brightness the lamps can work. Simply increasing the lamp beads does not increase the brightness but increases the resistance and energy consumption.

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