Making sense of generation estimates. This guide is for Northern Ireland homeowners considering solar electricity or storage, and the details should be checked against their own property and current local arrangements.
Why this matters for Northern Ireland homeowners
Annual kWh estimates are useful only when the assumptions are disclosed. Orientation, tilt, local weather, roof obstructions and system losses affect the result.
What to check before making a decision
Request expected monthly generation in addition to an annual figure. Consider whether generation occurs when your household is using electricity.
Questions to put to an installer or provider
Ask the installer to explain the prediction method and confidence limits. Do not confuse a system’s kW capacity with annual kWh generation.
Practical checklist
- Keep a copy of your electricity usage and recent bills.
- Ask for a written explanation of equipment, exclusions and assumptions.
- Confirm relevant Northern Ireland requirements before paying a deposit.
- Compare at least two detailed options where practical.
- Retain your quotation, warranties and handover records.
Where to go next
Explore our solar panel costs / electricity savings guidance, or browse the Solar Knowledge Base for shorter answers. For a property-specific recommendation, arrange a qualified assessment.
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