On March 22, 2024, the sales engineering team from TANFON SOLAR, a solar energy company, conducted a site survey at Northwood Adventist Primary School, an educational institution in Harare, Zimbabwe.

Currently, the school relies on a 16kW single-phase diesel generator and grid electricity to power its four water pump systems, 40 computers, lights in the library, as well as a 10kW electric stove and refrigerator in the cafeteria. However, the grid electricity supply is highly unstable, with daily power outages lasting several hours. Additionally, the cost of diesel consumption is expensive. Despite the school's daily electricity and water usage requirements of approximately 7 hours from 9:00 AM to 4:00 PM, the existing grid electricity and diesel generator cannot meet the school's needs. Therefore, the school is considering installing a solar power system as a backup power source alongside the diesel generator.

The water pumps are used to supply water to the school's bathrooms, cafeteria, and a small farm within the campus. There are also five small water pump systems dedicated to supplying water to an unused swimming pool. In the future, the school intends to utilize the solar power system to generate electricity for these five small water pumps, enabling the pool to be operational again.

Based on the on-site survey conducted today, considering the monthly electricity consumption and total power demand of all loads, we recommend configuring a 30kW three-phase off-grid inverter, as the school has both single-phase and three-phase water pumps. In addition, a 50kW solar panel system and corresponding lithium batteries will be installed.

Once the installation of this 30kW off-grid three-phase solar system is complete, the school will be able to meet its daily electricity needs from 9:00 AM to 4:00 PM. During exceptional cloudy or rainy days, the diesel generator and grid electricity can be used as backup power sources. The students at the school will no longer have to worry about a lack of water or electricity in the bathrooms, and the institution itself will save significantly on electricity and diesel expenses.

TANFON SOLAR customer service center Site Survey “NORTHWOOD ADVENTIST PRIMARY SCHOOL” In Harare, Zimbabwe

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