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Frequently Asked Questions

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  • City Saves Money with Solar Sewage Pumping Station

    City Saves Money with Solar Sewage Pumping Station


    Cities generate large amounts of domestic and industrial wastewater every day, and wastewater treatment is an important task for protecting the environment and human health. However, conventional wastewater treatment facilities usually rely on electricity supply, which not only increases energy costs but also negatively impacts the environment. To solve this problem, sewage solar pump system have emerged.

    System Components

    The components of this new solar power sewage treatment system consists of solar panels, inverter, three-phase alternating current (AC) control device, intelligent on-grid/off grid device and emergency backup utility grid.

    1. Solar System

    The station is equipped with highly efficient solar panels for collecting solar energy and converting it into electricity to supply the electricity required for the operation of the facility.

    2. Wastewater Treatment Units

    The station includes several wastewater treatment units, such as pre-treatment units, biological treatment units and coagulation and sedimentation units. These units work together to remove organic matter, nitrogen, phosphorus and other pollutants from the wastewater.

    sewage submersible pump system

    sewage submersible pump system

    3. Control System

    The station is equipped with an advanced automatic control system that monitors and regulates the operating status of the facility to ensure efficient and stable operation.

    solar-powered wastewater treatment system component


    Solar-powered sewage treatment systems can be used in remote areas with limited access to electricity. These systems are well-suited for various situations, including remote mining camps, temporary archaeological sites, farm, temporary labor camps, and small isolated communities that have access to solar energy.

    System Advantage

    1.Fast running

    Solar water treatment system running fast, during the operation of only one sewage pump, a blower, sewage pump running time of less than 1 hour per day, the blower only 1-2 weeks running 1 time, 1 time less than 0.5 hours; and the pump management can be achieved through the increase in automatic control system to run automatically, can be a large number of manpower in the maintenance of a large number of people, and energy consumption is greatly reduced, and therefore run.

    2.Energy Transformation

    The use of solar green energy is in line with the industrial policy and energy transition of each country. The system is compact and covers a small area, which greatly saves land resources, and the ground can be used for greening.

    solar powered sewage pumping station

    solar powered sewage pumping station

    3.Saving On Operating Costs

    The use of solar integration technology, the use of solar energy to provide power, without electricity, almost no operating costs, at the same time, to ensure that the system operates stably for a long period of time, through the effective combination of the grid, peak shaving to fill in the valley, achieve the minimization of operating costs.

    4.Off Grid System

    In addition to the solar system introduced above, solar system with power storage is also a common choice for sewage projects. This technology is completely separate from the municipal power grid to run alone, the power required for system operation is provided by the solar panels, but need to increase the energy storage system, to meet the normal operation of the system in cloudy and rainy days and other conditions of insufficient light, the energy storage system can meet the function of power supply for 7 days of cloudy and rainy weather.

    Project Showcase

    Namkoo helped a local village in Cebu, Philippines complete a solar sewage treatment project in 2023. The project consists of 4 sets 11kw solar sewage systems that purify the village's domestic and agricultural sewage and reduce the cost of electricity generated by sewage treatment.

    solar wastewater pump system in Cebu, Philippines

    solar wastewater pump system in Cebu, Philippines

    Are you still struggling with the high cost of electricity for your city, village, farm, or industrial wastewater treatment system? Try solar powered sewage stations! Immediately save 60%-90% on your electricity bill! Contact Namkoo for your free solar wastewater treatment system design and discounted quote.

  • Namkoo High Voltage BESS for Commercial & Industrial

    Namkoo High Voltage BESS for Commercial & Industrial

    In many African countries, unstable power grids lead to frequent outages and voltage fluctuations. C&I energy storage systems act as backup power, ensuring uninterrupted production and equipment safety, avoiding economic losses.

    With rapid response capabilities, these systems improve power quality, crucial for precision manufacturing and data centers. They also provide short-term emergency support, enhancing resilience against unexpected power events.

    Various factors have led to increased interest in cost-effective high voltage C&I battery energy storage systems in African countries. Through in-depth research and development in Africa, Namkoo has launched an all in one solar power storage cabinet that meets the power needs of users while keeping costs down.

    C&I BESS Application

    The energy storage system finds diverse applications in industrial parks, commercial buildings, EV charging stations, hospitals, schools, villa areas, and more. Key functions include:

    1、Peak shaving and valley filling: Enterprises store electricity during off-peak hours to reduce costs and release it during peak periods, optimizing electricity bills.

    2、Backup power: Vital for continuous supply in data centers, hospitals, and manufacturing plants during outages or emergencies.

    3、Load balancing: Balances power demand across time periods, cutting peak consumption and electricity bills.

    4、Power market participation: Systems engage in power trading, buying low-cost power and selling high-priced power during peak hours for profit.

    These applications are just a glimpse; more may emerge over time. Namkoo's SmartBase series tackles these challenges effectively.

    Commercial and industrial park with energy storage system

    All-in-one Design with 5 Highlights

    Modular design, flexible expansion, easy operation

    The SmartBase series by Namkoo comprises industrial and commercial outdoor storage cabinets featuring hybrid inverters and lithium batteries. With pre-assembled battery packs, installation is swift, taking just one day for setup and debugging on-site. Customers can select from various power segments to suit different backup power needs, ranging from 50kW/100kWh to 500kW/1MW, covering scenarios lasting 2 to 6 hours.

    The system allows flexible configuration and parallel connection, accommodating up to 10 units connected to the grid in parallel, achieving a maximum power generation of 2MWh. Off grid mode, three units can be paralleled, max up to 645kWh.

    Design for electrical safety

    The SmartBase outdoor BESS cabinets feature multiple safety designs to ensure personal and property safety:

    1、Aerosol + perfluorohexanone fire-fighting system delivers rapid and precise fire extinguishing.

    2、Protection level of IP54 withstands diverse outdoor weather conditions.

    3、Full system detection targets overvoltage, overtemperature, short circuit, and cooling system issues.

    4、Door-mounted integrated air conditioner maximizes cabinet space, enhances structural integrity, and improves waterproofing

    It utilizes A-grade lithium iron phosphate (LiFePO4) batteries with a cycle life of over 6000 cycles at 25°C and 0.5C discharge rate.

    Battery Container

    Supports 100% unbalanced load

    In regions with three-phase unbalanced conditions, industrial and commercial outdoor storage cabinets ensure optimal performance and cost savings. Supporting 100% unbalanced three-phase output and off-grid operation, they cater to single-phase load applications like air conditioning and lighting without additional equipment.

    The SmartBase plug-and-play energy storage system has reactive power and harmonic compensation functions, ensuring seamless integration with diverse loads and grids.

    It features an anti-backflow function, enabling excess power generation to charge the battery system when the load meets power consumption. This optimally distributes system power consumption, enhances self-use rates, and prevents solar power wastage.

    Built-in EMS, multiple certifications

    The industrial and commercial outdoor storage cabinet has a built-in EMS and supports multiple operating modes.

    With standardized structural design and menu-based function configuration, it allows optional accessories such as photovoltaic charging modules, off-grid switching modules, frequency transformers, and other components for scenarios like microgrids. It integrates into a comprehensive solar energy storage system cabinet.

    Real-time monitoring, intelligent control

    The local control panel can realize various functions such as system operation monitoring, energymanagement strategy formulation, and remote equipment upgrade.

    SmartBase Monitoring Cloud Platform

    Namkoo's battery energy storage systems, like SmartBase-100, are already powering numerous factories across Africa and Asia, reducing electricity bills and promoting energy autonomy. We're continually exploring new applications and, in line with market expansion and technological advancements, have introduced the SmartBase-001 residential solar power generator to serve homes, schools, and more in these regions.

    Namkoo solar power generator SmartBase 001

    Namkoo solar power generator SmartBase 001

    Drawing on extensive global market experience, Namkoo is committed to enhancing localized service systems and collaborating with local partners to deliver innovative digital energy storage solutions to African customers. Together, we aim to advance sustainable development worldwide.

  • What You Need to Know About Depth of Discharge: Prolong Your System Life

    What You Need to Know About Depth of Discharge: Prolong Your System Life

    Batteries are one of the most important parts of energy storage systems. With the reduction in battery cost, improvement in battery energy density, safety and lifetime, ESS is also widely used.

    This article will take a look at several important parameters of energy storage batteries and provide an in-depth explanation of depth of discharge, helping you to know how to extend the life of your energy storage system.

    Battery Parameters

    Battery capacity

    Battery capacity is one of the important performance indicators to measure the performance of the battery, the capacity of the battery has a rated capacity and the actual capacity of the battery.


    C is used to indicate the battery charge/discharge capacity rate.1C,2C,0.5C is the battery discharge rate. When the capacity used is discharged in 1 hour, it is called a 1C discharge; when it is discharged in 2 hours, it is called a 1/2 = 0.5C discharge.

    The calculation formula is:

    Charge rate=charge current/rated capacity

    Discharge rate=discharge current/rated capacity

    The higher the discharge current. The shorter the discharge time.

    energy storage system

    SOC(State of charge)

    The battery's state of charge refers to the disparity between a fully charged battery and the battery in use, indicating the amount of remaining electricity in the cell. This is calculated by dividing the remaining charge in the battery by the maximum charge it can deliver.

    SOH(State of Health)

    SoH of a battery describes the difference between a battery being studied and a fresh battery and considers cell aging.

    It is defined as the ratio of the maximum battery charge to its rated capacity.

    Generally when the capacity (SOH) of a battery drops to about 70% to 80%, it can be considered to have reached EOL (end of life). SOH is an indicator that describes the current health status of the battery, while EOL indicates that the battery has reached the end of life and needs to be replaced. By monitoring the SOH, it is possible to predict when a battery will reach EOL and to maintain and manage it accordingly.

    DOD (Depth of Discharge)

    DOD is a measure of the percentage between the amount of battery discharge and the rated capacity of the battery. For the same battery, the depth of DOD set is inversely proportional to the battery cycle life; the deeper the depth of discharge, the shorter the battery cycle life. Therefore, it is important to balance the required runtime of the battery with the need to extend the cycle life of the battery.

    For example, a battery with 5 kWh of power and 4 kWh of used power would be discharged to a depth of 80%.

    Depth of discharge and state of health

    Depth of discharge and state of health

    Why is DOD important?

    As more and more companies offer energy storage solutions, it has become common for consumers to find the right battery. DOD (Depth of Discharge) is one of the most critical factors you must consider when purchasing a battery energy storage system.

    Effect of DOD

    The deeper the discharge, the more likely the battery life will be shortened. Fully discharging a battery is generally not recommended as it can significantly shorten the life of the battery.

    Many battery manufacturers now give recommended discharge depths in their specifications, which indicate the extent to which the battery should be discharged as far as possible without damaging the battery structure. For example, if the maximum manufacturer's recommended depth of discharge for a 10 kWh battery is 80%, no more than 8 kWh of battery power should be used without recharging.

    How does deep discharge affect battery life?

    A high depth discharge is when a battery begins to release more energy in a specific amount of time. This can sometimes happen when a battery is deformed in mass. In most cases, deep discharging will significantly shorten the life of the battery, so you will have to pay more for energy storage.

    In terms of the effect of deep discharge on battery life, frequent charging and discharging will result in a shorter life. Therefore, it is recommended that you avoid discharging the battery beyond its deep discharge value.

    How do you keep your battery healthy?

    Now you know how deeply discharged batteries are, it is important to protect them from life loss.

    Therefore, in this part, we share some tips that will help enhance the health or life of your batteries:

    1、Avoid temperature extremes when storing or using your batteries, and don't expose your batteries to temperatures that are too low or too high, as these temperature extremes can accelerate degradation of the battery components.

    2、Minimize the amount of time the battery is left at 0% or 100% state of charge, as these extremes can stress the battery. Therefore, it is recommended that you charge the battery to 80% rather than 100%.

    3、Try to keep the battery in a controlled environment at room temperature, between 20 °C and 25 °C.

    4、Do not store the battery in an area with high humidity.

    In commercial and industrial application, we typically protect batteries from the environment and temperature by using cabinets. Namkoo's new all in one C&I battery energy storage system are designed to protect the batteries and prolong the whole system lifetime.

    battery energy storage system

    Namkoo commercial solar storage energy system

    This series of products has built-in PCS, EMS on-grid switching unit, power distribution unit, temperature control system, BMS system, fireprotection system, anti-surge device, etc. Cabinet design, easy to transport. IP55/1P65 protection level, can withstand various climatic environments.


    An energy storage system is made up of multiple components, and the charging/discharging conditions of the battery can directly affect the system's life. In addition, make sure you follow the lithium-ion battery manufacturer's recommended usage instructions to protect the battery!

  • Do you know there are A B C grade for solar cell?

    The grades of solar cell modules are generally divided into A grade, B grade, and C grade, and A grade modules can be divided into A+ and A- grades. Different grades of solar cell modules have a certain cost gap. We will briefly introduce the three grades of A, B and C:

    1. grade modules: A-grade is the highest quality grade of cells, and the modules can be used perfectly.

    2. level modules: B-level cells are slightly lower than A-level cells, and the modules can be downgraded.

    3. level modules: C-level cells are those with serious bad appearance and missing corners. These cells can be cut into small modules and supplied to customers with special needs.

    solar cell

    For manufacturers, the following three points can be used to detect whether the solar cells meet the usage standards:

    Before the case is encapsulated

    Visual inspection of battery samples:
    The color of the upper surface of the battery should be uniform, no mechanical damage, and no oxidation spots on the solder joints. The upper electrode of the battery and the bottom electrode of the battery should not fall off. The anti-reflection coating should not peel or discolor. Use vernier calipers and micrometers to measure the dimensions and thickness of battery samples, which should conform to product production standards.

     solar cell

    After the shell is encapsulated
    Physical size check:
    Check the physical characteristics and size requirements of the standard battery, such as the distance between the upper surface of the standard battery and the encapsulation glass of the casing, and the size of the encapsulation casing, which conform to the actual product standards.

    Appearance defect inspection:
    After the standard battery is packaged, the appearance defect inspection is carried out, focusing on checking whether the material has internal reflection, and the defects that may be caused during the packaging process, such as air bubbles, delamination, unclear marking, etc. In general, bubbles and delamination defects are the most critical.

    solar cell

    For consumers, the quality of solar cells can be judged from the following four points:

    Look at the surface of the module: Check whether the surface of the module is smooth and meticulous. Low-grade products are relatively rough, and the residual silica gel on the surface will reduce the power generation efficiency of the battery board.

    Look at the battery slices: Check the battery slices for broken edges and cracks. Low-level components are mostly spliced ​​with broken cells, which have great potential safety hazards and extremely low power generation efficiency.

    Look at the component frame: high-grade components are processed by machine framing, and the frame is neat and sturdy, while low-level components are generally processed by manual framing, which has problems such as frame deformation and instability.

    Look at the silica gel: Check whether the silica gel is evenly distributed around the back of the module and whether it penetrates tightly into the gap between the backplane and the frame. Low-level components are generally shoddy and easy to identify.

    Of course, for consumers, it is also necessary to confirm whether the module products are from regular brand manufacturers, and carefully check and check the warranty contract, invoice, etc. These details not only determine the quality of solar cells, but also determine the after-sales service and 25-year warranty service .

    solar cell

  • How to apply solar energy to agricultural drip irrigation system?

    Introduction of drip irrigation system:

    Drip irrigation is the most advanced and precise irrigation method at present. It uses a low-pressure pipeline system to transport water directly into the field, and then through the dripper, orifice or drip irrigation belt installed on the capillary and other irrigators, the water is dropped drop by drop. It is evenly and slowly dripped into the soil near the root zone of the crop, so that the soil in the area with the most developed crop root system often maintains a suitable humidity, so that the water, fertilizer, gas, heat and microbial activities of the soil are always in good condition, which is conducive to the high yield of crops. Create favorable conditions for stable production. Drip irrigation belts are divided into patch type drip irrigation belts, embedded cylindrical drip irrigation pipes, and labyrinth drip irrigation belts.

    drip irrigation system

    The use and laying of drip irrigation tape:

    1. When laying the drip irrigation tape, care should be taken not to make the drip irrigation tape too tight to avoid installation inconvenience. Too loose will cause waste of drip irrigation belt.
    2. When laying the dropper belt, pay attention to clean up the sediment where there is a fracture. Prevent unnecessary troubles such as clogging of the dropper belt in later use.

    3.  The connection should be fixed well to prevent water leakage. If water leakage is found during use, it should be dealt with in time.

    4. When laying the drip irrigation belt under the film, the land must be leveled in advance to remove the gravel and clods to prevent the drip irrigation belt from being damaged. Never allow a large gap between the mulch bump and the drip irrigation tape to prevent the drip irrigation tape from being burned by sunlight. In addition, the dropper tape (tube) can be properly buried to prevent burns.

    5. The connection sequence of the dripper belt system is usually: head valve, fertilizer applicator, filter, main pipe, branch pipe, bypass, drip irrigation belt (pipe).

    Applicable conditions of drip irrigation belt:

    1. It is used for planting crops in greenhouses and greenhouses, reducing pests and diseases, saving chemical fertilizers and pesticides, and improving economic benefits.
    2. For orchard irrigation, it can effectively increase yield, improve fruit quality, and effectively control the growth of weeds.

    3. It is suitable for various field crops such as cotton, Chinese herbal medicine, watermelon, field vegetables, etc., to improve the mechanized planting.

    4. The drip irrigation tape can be bent and laid around the ridge, which is easy to operate.

    Precautions for use:

    1. The dripper belt (tube) dripper is easy to be blocked, so a filter must be installed. For poor water quality, in addition to installing a filter with better filtration capacity, sedimentation and chemical treatment can be carried out if necessary.
    2. For the dropper tape that has not been used for a long time, you can open the valve to drain a little before use, and then carry out drip irrigation. 3. The use of dropper belt fertilization can only apply liquid fertilizer or easy-to-dissolve fertilizer, not farmyard manure.

    3. Due to the high material cost of the dripper belt irrigation method, it is more suitable for economic crops with high added value.

    4. Drip irrigation cannot adjust the microclimate of the farmland. During the freezing period, it is not recommended to use the drip tape (pipe) for irrigation.

    Drip irrigation is currently the most effective water-saving irrigation method in arid and water-deficient areas, and its water utilization rate can reach 95%. Drip irrigation has higher water-saving and yield-increasing effects than sprinkler irrigation, and can be combined with fertilization to more than double the fertilizer efficiency. It can be used for irrigation of fruit trees, vegetables, cash crops and greenhouses, and can also be used for field crop irrigation in dry and water-deficient places.

  • Do you know the difference between 5 types solar panels?

    When a solar cell is graded, it means that the manufacturer has tested each cell within a particular solar panel to determine how efficient they are. A Solar Panel Grading is based on the types and the degrees of defects that a Panel Includes. These grades have a range from A to D, The difference between 5 types solar panels are solar panel efficiency.


    Grade - A : A- Grade solar panels are a type of photovoltaic panels that is considered to be a high-end product.

    It usually refers to a panel that is free of flaws (such as missing busbars, missing prints, bends, scratches, etc.) and covered by the manufacturer's regular warranty.


    Grade – B : B- Grade solar cells usually has some imperfections or blemishes  but has the "same" electrical output as Grade - A.

    The difference is that B grade panels are not covered by a manufacturer's standard warranty , they have visual flaws, and their price is a little lower than A Grade panels.


    Grade - C : C- Grade solar cells are those with a flaw that affects the power output, so their output is lower than A and B Grade cells, and their price lower.


    Grade – D: D- Grade solar cells are generally considered unusable and thrown out by manufacturers.


    As a result, each solar panel is given a grading depending on its performance and whether or not it has physical flaws.

    the difference between 5 types solar panels

  • What's the payment term of Namkoo?

    Namkoo accept T/T, L/C, Western union, trade assurance and cash. 30% for deposit and 70% balance before shipment.

  • What certificates does Namkoo have?

    Namkoo's solar energy products are approved by CE, Rohs, SGS, SONCAP, VDE and other certifications.

  • Can you customize the solar product?

    Yes, Namkoo is an experienced solar factory, ODM and OEM customization of solar products are acceptable as according to customer requirement.

  • Is Namkoo a manufacturer or trading company?

    Namkoo is the solar manufacturer specialized in on grid and off grid solar power system, solar panel, solar water pump system and other solar products over 18 years. Apart from it, we can also provide ODM and OEM services of solar energy system for our customers.