Understanding whether the parameters of a solar lamp are reasonable is essential for various stakeholders, including manufacturers, wholesalers, and end-users. For manufacturers, accurate parameters ensure product quality, regulatory compliance, and competitiveness.

了解太阳能灯的参数是否合理对于制造商、批发商和最终用户等各利益相关方都至关重要。对于制造商来说，准确的参数可确保产品质量、法规合规性和竞争力。

For wholesalers, verifying parameters helps in making informed stock decisions, optimizing sales strategies, and enhancing customer satisfaction. End-users benefit from this knowledge through the effective performance, cost-efficiency, and durability of the solar lamp.

对于批发商来说，验证参数有助于做出明智的库存决策、优化销售策略和提高客户满意度。最终用户则通过太阳能灯的有效性能、成本效益和耐用性从这些知识中受益。

Additionally, given that many suppliers may display misleading or exaggerated parameters, verifying these specifications can reveal whether a supplier is being honest or misleading. Suppliers that provide accurate information are more trustworthy and reliable, and long-term business relationships with them are more likely to grow mutually.

此外，鉴于许多供应商可能会显示误导性或夸大的参数，验证这些规格可以揭示供应商是诚实的还是误导性的。提供准确信息的供应商更值得信赖和可靠，和他们建立长期业务关系更有可能相互成长。

Let’s calculate the following example and confirm whether its parameters are reasonable. All-in-one solar lamp, LED output power is 120W, luminous flux is 20400 lumens, photovoltaic panel is 36V 230W, lithium iron phosphate battery is 25.6V 96Ah, lamp size is 1545*788*70mm

Power	Lumens (lm)	Solar Panel	LiFePo4 Battery	Charge Time	Backup Time	Lamp Size L*W*H (mm)
120W	20400lm	36V 230W	25.6V 96Ah	6-8 Hours	> 3 Days	1545*788*70

Let’s calculate the luminous efficiency first, and divide the luminous flux by the power (20400÷120=170lm/w). This luminous efficiency is normal. Most solar street lights below 80W using first-line brand lamp beads such as Philips and Core can reach 180lm/w. The higher the power, the lower the luminous efficiency. Therefore, 120W can reach 170lm/w, which is a good value and reasonable.

我们先来算算光效是多少，用光通量除以功率20400÷120=170lm/w，这个光效属于正常水平，大部分的太阳能路灯80W以下使用飞利浦和科睿等一线品牌灯珠都可以达到180lm/w，功率越高光效越低，所以120W能达到170lm/w是不错的一个数值，也是合理的。

As for the power of photovoltaic panels, assuming that the size of the photovoltaic panel is the same as the length and width of the lamp body, that is, 1545*788mm ≈ 1.2㎡, and assuming that the efficiency of the photovoltaic panel is 20%, the estimated power of the photovoltaic panel is 1.2*1000*20%=240W (1000MJ/㎡ is the solar irradiance). The parameter table shows 230W, so it is reasonable.

光伏板功率方面，假设光伏板尺寸和灯体一样长宽，即1545*788mm ≈ 1.2㎡，假设光伏板效率是20%，估算光伏板功率是1.2*1000*20%=240W（1000MJ/㎡是太阳辐照度）。参数表显示230W，所以也是合理的。

Then we take a look at the charging efficiency. The battery capacity is 25.6*96=2457.6Wh, 2457.6÷230=10.68 hours. Considering that the energy conversion efficiency of MPPT is about 90%, 10.68÷90%=11.86, which means that the photovoltaic panel can be fully charged in 11.86 hours at the fastest, which is different from the 6-8 hours charging time shown in the data.

再来看看充电效率，电池容量是25.6*96=2457.6Wh，2457.6÷230=10.68 hours。再考虑到MPPT的能量转换效率大概在90%，10.68÷90%=11.86，代表光伏板最快11.86小时可以充满电，这和资料显示的6-8小时充电时间有误差的。

In terms of working time, this product is advertised as 12 hours and can be used for more than 3 days. We divide the battery capacity by the output power of the light source: 2457.6÷120W=20.48 hours. Referring to the GCOTS street light, which runs at full power for about 7.68 hours, can work for 12 hours, and has a backup time of 1 day in dimming mode, the battery life of this street light is 2.6 times that of GCOTS, so it is reasonable to work for 12 hours and have a backup time of more than 3 days (assuming the same dimming mode).

工作时间方面，这个产品标榜是12小时，且能再使用3天以上的时间。我们用电池容量和光源输出功率相除：2457.6÷120W=20.48 hours。参考GCOTS的路灯满功率运行约7.68小时，调光模式下可以工作12小时和1天备用时间，这款路灯的续航时间是GCOTS的2.6倍，所以工作12小时，3天以上的备用工作时间是合理的（假设是同一个调光模式）。

Finally, we analyze whether the space of the lamp body can accommodate such a large battery. At present, the commonly used battery types in solar lamps are 32650 cylindrical batteries and square batteries. 32650 batteries are of better quality and higher price. High-power solar street lights are more likely to use better batteries. Assume that 32650 batteries are used.

最后分析灯体的空间是否能装下这么大的电池。目前太阳能灯中常用的电池类型是32650的圆柱形电池和方形电池，32650的电池品质更好价格也会更高，对于大功率的太阳能路灯更有可能使用更优的电池，假设使用的是32650电池。

When analyzing the internal space of the solar lamp, we considered different battery placement options to ensure that the battery pack fits within the dimensions of the lamp. The battery type is 32700 LiFePO4 cylindrical cells, with a diameter of 32 mm and a height of 70 mm. The battery configuration is 8 series, 16 parallel, totaling 128 cells.

在分析太阳能灯具的内部空间时，我们考虑了电池的不同放置方式以确保电池包能够适应灯具的尺寸。电池类型为32700磷酸铁锂圆柱体电池，直径32 mm，高度70 mm。电池配置为8串16并，总共128节电池。

Single Layer Battery Placement 单层电池排列

When the batteries are arranged in a single layer, with a height of 32 mm, the length of each battery is 70 mm, and the width is 32 mm. The calculation for single-layer battery placement is as follows:

当电池单层排列时，高度为 32 毫米，每个电池的长度为 70 毫米，宽度为 32 毫米。单层电池放置计算如下：

• Width-wise: Up to 788 mm/32 mm ≈ 24 cells​ can be placed.
• Length-wise: Up to 1545 mm/70 mm ≈ 22 cells can be placed.

• 宽度方向：最多可放置 788 毫米/32 毫米 ≈ 24 节电池。
• 长度方向：最多可放置 1545 毫米/70 毫米 ≈ 22 节电池。

Therefore, the total number of single-layer batteries is 24 x 22 = 528, which is far more than the required 128 batteries, indicating that the single-layer battery placement can fully accommodate.

因此，单层电池的总数为 24×22=528节，远远超过所需的128节电池，说明单层电池放置完全可以容纳。

Two-Layer Battery Placement 双层电池排列

When the batteries are stacked in two layers, with each layer having a height of 32 mm and a total height of 64 mm, the calculation is as follows:

当电池堆叠两层，每层高度32mm，总高度64mm时，计算如下：

• Width-wise: Up to 788 mm/32 mm ≈ 24 cells can be placed.
• Length-wise: Each layer can hold 64 cells. With two layers, a total of 128 cells can be arranged.

• 宽度方向：最大可放置 788 mm/32 mm ≈ 24 个电池。
• 长度方向：每层可容纳 64 个电池。两层共可容纳 128 个电池。

Assuming that there are 3 rows of batteries on each layer and the battery length of each row is 70 mm, the total length is calculated to be 3×70 mm=210 mm, which is fully within the luminaire length range of 1545 mm.

假设每层有3行电池，每行70 mm的电池长度，计算总长度为 3×70 mm=210 mm，这在1545 mm的灯具长度范围内完全适应。

Whether arranged in a single layer or two layers, the battery pack fits easily within the internal space of the solar lamp. Calculations show that both single-layer and two-layer placements meet the size requirements of the lamp, providing ample space for the battery pack.

无论是单层还是双层电池放置方式，都可以轻松地放置在太阳能灯具的内部空间中。计算表明，单层放置和双层放置均适合灯具的尺寸要求，提供了充足的空间来容纳电池包。

The lamps in the example can only show their greatest value in areas with an average sunshine time of more than 10 hours. However, as far as I know, there are not many countries and regions with such conditions. In other places, even if the battery capacity is large and can theoretically reserve power for more than 3 days, there are not many opportunities to fully charge it, so the actual power consumption may still be 2 days, which is 12 hours plus a backup day.

例子中的灯具只有在平均日照时间10小时以上的区域才能体现最大的价值，但是据我了解具备这样条件的国家和地区并不多，在其他地方即使电池容量很大，理论上可以储备3天以上的电量，但是能充满电的机会不多，所以实际的电量可能还是2天的电量，也就是12小时加一个阴雨天的时间。

Another product defect is the excessive pursuit of battery theoretical life. The cost of the battery will increase a lot, and the weight of the lamp body will increase a lot. The requirements for the load-bearing capacity of the lamp pole will also be higher, and a thicker lamp pole will be needed, which will further increase the initial investment cost.

另一个产品缺陷是过度地追求电池理论续航，电池的成本会增加很多，而且灯体重量会增加很多，对灯杆承重的要求也更高了，需要配备更厚的灯杆，初始投资成本进一步提高了。

It can be seen from the picture that the lamp housing is made of aluminum profiles, which are lighter and cheaper than die-cast aluminum. I think this may also be the consideration made by the designer in order to save some costs and reduce the burden on the lamp pole. However, due to the low charging efficiency of high-power integrated solar street lights, it is still not suitable to design too large batteries. We at GCOTS still adhere to a pragmatic attitude. If customers need high power and higher battery life requirements, we still recommend choosing a split solar street light solution.

图片中看得出来灯壳使用的都是铝型材，相比压铸铝重量会更轻也更便宜，我想这也许也是设计者为了节省一些成本和减轻对灯杆的负担所作出的考虑。但是大功率一体式太阳能路灯在充电效率不够高这一特点上，还是不适合设计太大的电池，我们GCOTS还是坚持实事求是的态度，假如客户需要大功率切较高的续航要求，我们还是建议选择分体太阳能路灯的方案。

This is a series of thoughts I had after seeing the parameters of a product on a customer’s website. If you have any questions, please feel free to consult us.

这是我在客户网站上看到一款产品的参数之后产生的一系列想法，如果有疑问可以随时咨询我们。