🔬 Research Notes – Hybrid Solar Microgrid
for a Rural School
CONTEX: WHY SOLAR MICROGRIDS?
 Rural schools in Pakistan often experience 6–12 hours of power cuts or no grid access.
 Pakistan has an excellent solar potential (4.5–6.5 kWh/m²/day).
 Solar micro grids are modular, scalable, and clean, making them ideal for off-grid communities.
TYPICAL
ENERGY
NEEDS
OF
A
RURAL SCHOOL
 Lighting (10 LED bulbs, 10W each, 6 hrs): ~0.6 kWh/day
 Ceiling Fans (4 units, 70W, 8 hrs): ~2.2 kWh/day
 Laptops/Computers (5 units, 50W, 6 hrs): ~1.5 kWh/day
 Small Refrigerator (120W, 33% duty, 8 hrs): ~0.3 kWh/day
 Water Pump (500W, 1 hr): ~0.5 kWh/day
 ➡ Total ≈ 5.1 kWh/day ( 5 units )
SYSTEM DESIGN PROPOSAL
 PV Array: 1.5 kW capacity (approx. 5 standard 330W panels).
 Battery Storage: 13.6 kWh Lithium-ion (2 days autonomy).
 Inverter: 2.0 kW hybrid inverter with MPPT controller.

Distribution Panel: Supplies AC power to lighting, fans, ICT equipment, refrigeration, and water
pump.
OPERATION PRINCIPLE
 Solar PV converts sunlight into DC electricity.
 Electricity is stored in battery banks for evening/night use.
 Inverter converts DC → AC to run appliances.
 School loads (lighting, fans, laptops, fridge, pump) are powered reliably throughout the day.
KEY BENEFITS
 Reliable electricity → uninterrupted classes.
 Improved learning → ICT tools can be used.
 Health & safety → refrigeration for vaccines, clean water from pumps.
 Economic savings → reduced fuel costs compared to diesel generators.
 Sustainability → zero emissions, long-term solution.
RELEVANT CASE STUDIES
 Punjab (Akhuwat Foundation): Piloted solar-powered schools to improve attendance and ICT
learning.
 Buksh Foundation (Pakistan): “Light a Village” program electrified over 100 rural villages using
solar microgrids.
 Karachi (Indus Hospital, Korangi, 2019): Installed a large solar-hybrid microgrid to reduce diesel
use and grid dependency. The hospital now runs much of its essential equipment on solar
energy, showing the reliability of such systems in major institutions.
 India (Rajasthan & Uttar Pradesh): Rural schools with solar microgrids reported higher
attendance, reduced dropouts, and better access to digital tools.