1. There is a serious false standard in the parameters of solar lamps

Most solar lamp sellers will make false parameters, especially solar street lamps and solar flood lights. The power of the lamp is often 100 watts, 200 watts or even 500 watts, and the actual brightness is not even one-tenth. The fundamental reasons for this chaos are: first, there is no unified national/industry standard for solar lamps; second, there is no simple and direct power measurement tool, even the manufacturers probably know the power of the lamps according to the parameters of the power controller; Everyone is imagining the standard, and consumers only know that the higher the power, the brighter, and the product will not sell if the power is not imaginary, so it can only be imaginary.

The power of the solar lamp is limited by the battery capacity, and the battery capacity is limited by the photovoltaic panel. To make a solar lamp with an actual brightness of 100 watts, if it is only bright for 8 hours, at least 3.7V ternary lithium batteries 220AH and 6V are required. 260 watts of photovoltaic panels, which will require a high price and is technically difficult to achieve.

2. Photovoltaic panels and batteries must match.

Some manufacturers’ solar lights are marked with 15A batteries but equipped with 6V15W photovoltaic panels. I feel very speechless about this. The peak value of 6V15W photovoltaic panels can generate 2.5AH of electricity per hour. The average sunshine duration in my country is 4.5H. This configuration is to think that 2.5AH photovoltaic panels can fully charge a 15A battery in 4.5 hours?

Someone might say, except for 4.5 hours, do not consider other time? After all, in addition to the peak 4.5 hours, electricity can also be generated at other times! Yes, there is nothing wrong with this statement. First of all, the efficiency of electricity production at other times except for the peak time is very low; secondly, the peak capacity conversion here is calculated based on 100% conversion. The process of photovoltaic power generation to charge the battery can reach 80% conversion, which is not bad. The reason why your 10000mA power bank cannot charge the 2000mA iPhone 5 times. As for the details that are not calculated here, it is because we are not engineers in this area and do not need to be very detailed.

3. The use of monocrystalline silicon photovoltaic panels does not mean that it is better than polycrystalline silicon.

Many businesses advertise that their solar lamps and photovoltaic panels are made of monocrystalline silicon, which has high conversion efficiency, and how better it is than polycrystalline silicon. I am speechless. From the perspective of solar lamps, the quality of photovoltaic panels should be whether it can fully charge the batteries of the lamps. If the photovoltaic panels are all 6V15W, the electricity produced per hour is 2.5A, and your monocrystalline silicon is better than my polycrystalline silicon. there? If it's just to fool you to sell high prices, I'm sorry.

The dispute between monocrystalline silicon and polycrystalline silicon has always existed. In laboratory tests, the efficiency of monocrystalline silicon is indeed a little higher than that of polycrystalline silicon, but in installed applications, the gap between them is not large. Applied to solar lamps, whether it is monocrystalline or polycrystalline, as long as high-quality photovoltaic panels can be used, it is good.