Before committing to a rooftop solar project, make sure you’ve checked these 5 critical factors.
1. Roof Condition and Structural Capacity
Your roof must be able to support the additional weight of solar panels (approximately 15-20 kg/sqm). Key checks:
- Roof age and material condition
- Load-bearing capacity (structural engineer assessment)
- Waterproofing status
- Remaining roof lifespan (should be 10+ years)
2. Rooftop Space and Orientation
- Minimum viable area: ~500 sqm for a 100kW system
- South-facing orientation is optimal
- East/West-facing still viable (5-15% less generation)
- Avoid shading from nearby buildings, trees, or equipment
3. Electricity Consumption Pattern
- Daytime-heavy usage maximizes solar self-consumption
- TOU tariff users benefit most from peak-hour offset
- Minimum viable consumption: ~50,000 kWh/month
- Review your PEA/MEA bills from the past 12 months
4. Grid Connection Requirements
- PEA (Provincial) or MEA (Bangkok) approval required
- System size affects approval complexity
- Over 1MW may require additional studies
- Your EPC contractor should handle this process
5. Partner Selection
Choose a solar partner with:
- Own manufacturing or direct supply chain (price advantage)
- Certified EPC team (quality assurance)
- Flexible business models (options for your situation)
- Local presence and after-sales capability
- Multi-language support if needed
Free Site Survey
Red Solar offers complimentary rooftop assessments for qualified businesses. We’ll evaluate all 5 factors and provide a detailed proposal — no obligation.
