CASE STUDY

Success Story - Palau

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Innovative Solar Energy Storage

A Greener Future

Self-Sufficient Energy and Efficient Utilization

Palau has long relied on imported diesel for power generation, which has high electricity prices and serious carbon emissions. Agriculture, fishery facilities and residential electricity demand are diverse, and there is an urgent need for a stable and sustainable supply of green energy.

Why is Palau suitable for a solar-plus-storage microgrid solution?

Rich solar energy resources:

Long sunlight hours and rich solar energy make it ideal for solar power development.


Reduce reliance on imported fuel and lower power generation costs:

Imported fuel is costly, and solar-plus-storage can reduce fuel dependence. Solar power generation costs have been declining yearly, offering better cost-efficiency than fuel-based generation and enhancing energy independence.


Overcome geographical constraints and respond to disasters:

The island's terrain makes centralized large-scale power transmission challenging and costly. A solar-plus-storage microgrid system allows for distributed deployment with high flexibility and recoverability, making it an ideal choice for post-disaster power recovery.



The island climate enhances photovoltaic operation efficiency:

Frequent rainfall naturally cleans solar modules, significantly reducing maintenance and cleaning costs and optimizing site operation efficiency. 

Challenges

Load requirements: refrigerators, air pumps, electric fans, lights, etc.

  • Structural Limitation: The existing structure of the agricultural machinery shed is simple, with the roof support mainly composed of wooden stakes and cement used only at the base for fixation. This design has high requirements for load-bearing capacity and is challenging to construction
  • Power Demand and Configuration: The meter box in Area A is approximately 4.57 to 6.09 meters away from the agricultural shed, with primary power needs of 110V, while some large machinery requires 220V, which requires additional consideration of power distribution and stability.
  • Insufficient Network Construction: No Wi-Fi and poor communication quality, which affects the real-time performance of equipment monitoring and energy management.

Load requirements: air conditioners, incubators, industrial fans, high-pressure sprayers, solid-liquid separators, submersible pumps, ceiling fans, freezers, refrigerators, heaters, lights, etc.

  • High Demand for Green Electricity:  24,900kWh of electricity per month, 218.4kWp of solar energy and 1720kWh of energy storage capacity need to be built.
  • Insufficient Grid Capacity: The total capacity of the Palau power grid transformer is only 150kVA, which cannot carry the excess power of solar energy.

Load requirements: blowers, water pumps, freezers, air conditioning for feed storage rooms, etc.

  • Inadequate infrastructure: Buildings have not yet installed electricity meters, which affects power access and energy management system deployment.

Solution

Integrated Solar-Plus-Storage System (On-Grid)

Dynamically adjust the power system anytime to optimize electricity costs and resource utilization


  • Efficient Power Storage: Solar PV > Load, the load is powered by solar energy, with excess electricity charging the storage battery.
  • Intelligent Backup: Solar PV < Load, both solar power and the storage battery supply the load (the battery is prioritized, with grid power used only when the battery is insufficient).
  • Pure Energy Storage Power Supply: Solar PV does not generate electricity and the battery capacity is sufficient, and the load is supplied by the energy storage battery.
  • Grid Support and Energy Storage Charging: Solar PV does not generate electricity and the battery capacity is insufficient, and the grid powers the load and optionally charges the battery as per scheduled settings.

Solar-Plus-Storage System

Demonstration Farm

Supports the operation of agricultural equipment such as refrigerators, farm lighting and tools, and is suitable for small distributed load scenarios.


  • Solar PV Capacity - 12.74kWp
  • Energy Storage Capacity- 79.2kWh
  • Equipment Used - PS20 Residential/Commercial Energy Storage System (4 Units)

Solar-Plus-Storage System

Aquaculture Center

Stable support for pumping, freezing and feed preservation equipment operation, green electricity coverage rate of 50%.


  • Solar PV Capacity - 28.67kWp
  • Energy Storage Capacity - 178.2kWh
  • Equipment Used - PS20 Residential/Commercial Energy Storage System (9 Units)

Independent Solar-Plus-Storage Microgrid

(Off-Grid)

Independent solar-plus-storage microgrid delivers stable, self-sufficient power to the entire area.


  • PCS Parallel Connection: Through PCS parallel, the solar storage microgrid can be separated from the power company to build an independent power system to provide a stable supply for the load.
  • Dynamic Power Adjustment: The EMS (Energy Management System) dynamically adjusts PV inverter output based on battery capacity. Excess energy is stored in the battery when generation exceeds load demand, and the storage system supplies power when generation is insufficient.
  • Maximize Power Generation Efficiency: The built-in MPPT of PV inverters continuously tracks the maximum power point, ensuring optimal efficiency.
  • Bidirectional Charging and Discharging: Supports DC & AC bidirectional charging and discharging, allowing excess power to be stored flexibly for stable supply during nighttime or low sunlight conditions.

Stand-alone Solar-Plus-Storage Microgrid System

Livestock House and Dormitory

EMS intelligently controls the matching of solar storage and load, provides all-weather power supply for agricultural facilities, offices and dormitories, and supports independent off-grid operation in the whole area.


  • Solar PV Capacity - 218.4 kWp
  • Energy Storage Capacity - 1720 kWh
  • Equipment Used - Giga 40K Inverters (6 Units), Fusio 215kWh Commercial & Industrial Energy Storage Cabinet (8 Units), BNP100K Power Conditioning Systems (2 Units)
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Results

Palau’s success story fully demonstrates the technical expertise and innovative strength of Billion Group in the field of photovoltaic storage microgrid, and successfully helps Palau achieve energy self-sufficiency and significant reduction of carbon emissions through customized green energy solutions. This not only meets the diverse electricity needs of local agriculture, fisheries and residents, but also provides a replicable demonstration of energy transition for other Pacific Island countries.

Case Studies

Solar Energy Storage Microgrid Solution

Empowering Pacific Island Countries to Achieve Energy Revolution

The integrated solar storage system converts sunlight into electricity, stores excess energy, monitors power generation, and discharges electricity when needed, reducing dependence on the power grid.

Success Story - Tuvalu

Creating Self-Sufficient Energy

for Farmers

Faced with multiple challenges such as extreme weather, insufficient infrastructure and high cost of electricity. Billion provided flexible and efficient solar-plus-storage solutions to ensure reliable energy for smallholding loads and residents' urgent power needs.

Success Story - Marshall Islands

Green Energy Transition

in Saline Environment

The Marshall Islands has long relied on imported diesel power generation, with high energy costs and unstable supply, and transited to renewable energy and utilize solar power as an alternative, which becomes the key to achieving sustainable development.

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