Gilutongan Island, Cebu, Central Visayas
An off-grid Cebu project where usable energy differed from potential
A study of a 7.92 kWp off-grid system serving 11 households estimated 6,510 kWh of potential annual energy but 4,674.5 kWh of usable supplied energy, showing the importance of storage, load matching, and operating constraints.
Documented project figures
System size: 7.92 kWp
System type: Off-grid
Documented annual output: 4,674.5 kWh
Specific yield: 590 kWh/kWp/year
Evidence period: 2020–2021 monitored study
What the source does not prove
What this should change in your planning
- Off-grid design is an energy-service problem, not only a panel-count problem.
- Potential solar energy can exceed energy that batteries and loads can actually use.
- Define essential loads and operating hours before choosing storage.
How to compare this case with your own project
Start with capacity, system type, location, evidence period, and specific yield. This 7.92 kWp project documents 4,674.5 kWh of annual production, but that figure should not be copied directly into another property. Roof orientation, shade, weather, inverter limits, downtime, maintenance, and the share of electricity used during daylight can change both production and financial value. Compare the documented yield with the visible national planning range, then enter your own bill, roof, and backup requirements in the calculators.
Treat the project as evidence, not a promise of identical results.