Factory solar involves 5 protection types: (1) Product warranty 10-25yr covering manufacturing defects (2) Performance warranty 25-30yr guaranteeing 80-88% output (3) Workmanship warranty 2-10yr from EPC contractor (4) EAR/CAR installation insurance at 0.15-0.35% of project value (5) OAR operational insurance at 0.2-0.5%/yr. Under PPA the provider carries all insurance; under EPC the factory pays — insurance costs just 0.5-1.5% of annual electricity savings.
5 Types of Solar Protection Every Factory Must Understand
A factory solar system operates for 25-30 years. Throughout this period, multiple risks need coverage — from the first day of installation to the final year of operation. Each phase has its own insurance and warranty instrument.
1. Product Warranty
Duration: 10-15 years (standard) or 25 years (Tier 1 / premium)
Provider: Panel manufacturer / inverter manufacturer
Covers: Cell cracking, delamination, junction box failure, glass breakage from manufacturing defect
Does NOT cover: Natural disaster damage, improper installation, normal wear and tear
Key watchpoint: Will the manufacturer still exist in 15-25 years? Use Tier 1 bankability as a proxy for warranty longevity.
2. Performance Warranty
Duration: 25 years (standard), 30 years (2026 Tier 1 standard)
Terms: Year 1 loss <1-2%, then 0.4-0.55%/year degradation, minimum 80-88.5% output at end of warranty term
How to claim: Requires independent I-V curve measurement proving output is below guaranteed threshold
Key watchpoint: Performance warranty is only valuable if you MONITOR your system — no monitoring = cannot detect underperformance = cannot claim
3. Workmanship / Installation Warranty
Duration: 2-5 years (standard Thai EPC), up to 10 years (premium EPC)
Provider: EPC contractor — NOT the panel manufacturer
Covers: Installation defects — wiring, mounting, waterproofing penetrations
Overlaps with Defects Liability Period (DLP) in EPC contracts: typically 12-36 months
Key watchpoint: If EPC company goes out of business, this warranty dies with them — choose established EPCs
4. Installation Insurance — EAR & CAR
EAR (Erection All Risks)
Covers machinery/equipment during transport and installation — accidental damage, theft, fire. Duration: from delivery to commissioning (typically 2-6 months).
CAR (Contractors All Risks)
Broader coverage than EAR — includes third-party liability (damage to factory property), worker injury. Duration: construction period + maintenance period (typically 12 months post-completion).
Combined EAR/CAR premium: approximately 0.15-0.35% of project value (one-time)
Key watchpoint: Verify your EPC contractor has valid EAR/CAR before work begins — request the certificate
5. Operational Insurance — OAR & Property
OAR (Operational All Risks)
Post-commissioning solar asset insurance — covers equipment breakdown, natural disaster, theft, fire. Optional add-ons: BI (Business Interruption) / DSU (Delay in Start-Up). Premium: 0.2-0.5% of asset value/year, renewable annually.
Property Insurance Extension
If the factory already has property insurance, extending it may be cheaper than standalone OAR. But you must explicitly declare the solar system value and equipment location to the insurer.
Warning: Some property policies EXCLUDE rooftop equipment not originally part of the building — verify before assuming coverage
IDI (Inherent Defects Insurance)
Covers latent defects in design/construction discovered post-completion. Duration: 5-10 years. Particularly relevant for large installations (>500 kWp).
Product Warranty vs Performance Warranty — The Difference That Matters
Sellers often say "25-year warranty" without clarifying whether it's product or performance — they cover entirely different things.
| Aspect | Product Warranty | Performance Warranty |
|---|---|---|
| Covers | Manufacturing defects | Power output degradation beyond guaranteed threshold |
| Duration | 10-25 years | 25-30 years |
| Claim trigger | Physical defect found | Measured output below guarantee |
| Proof needed | Visual inspection / testing | Independent I-V curve measurement |
| Resolution | Replace defective unit | Replace or compensate for underperformance |
| Cost to claim | Shipping cost (sometimes manufacturer pays) | Testing cost (owner typically pays for measurement) |
| Common mistake | Assuming "25-year warranty" covers everything | Not monitoring system, so never detecting underperformance |
PPA vs Self-Investment — Who Carries the Insurance?
The CFO's favorite question: "Do I still pay for insurance under PPA?" Short answer: No, but there are other risks you must understand.
Thailand-Specific Risk Factors for Factory Solar
Thailand has unique risk factors affecting both insurance and warranty — from the historic 2011 floods to one of the world's highest lightning strike rates.
Flooding
The 2011 floods destroyed hundreds of factories, but rooftop panels are generally SAFE (elevated). The vulnerable components are inverters and wiring at ground level. Factories in flood-prone zones (Ayutthaya, Pathum Thani, Samut Prakan) must elevate electrical components 50-100 cm above ground.
Storms / Wind
Thailand is less exposed than the Philippines/Vietnam, but tropical storms can still produce 120+ km/h winds. Panel mounting must meet wind load specifications per Thai building code. Standard storm insurance deductible: 5-10% of claim value.
Hail
Hail is rare in Thailand but increasing with climate change. Panels tested to IEC 61215 withstand 25mm hail at 83 km/h. Larger hail can crack glass — covered by OAR/property insurance.
Lightning
Thailand has one of the highest lightning strike rates globally. Proper earthing/grounding is critical. Lightning damage to inverters is the #1 insurance claim for Thai solar systems.
Humidity & Corrosion
Thailand's 70-90% humidity accelerates PID (Potential Induced Degradation) in P-type panels. Coastal industrial zones (Map Ta Phut, Laem Chabang, Eastern Seaboard) face salt mist corrosion risk. N-type panels are more PID-resistant than PERC — technology choice reduces insurance risk. IEC 61701 salt mist certification required for coastal installations.
Fire Risk
DC arc fault is the primary fire risk. Factories with combustible inventory (chemicals, textiles, plastics) need AFCI protection. Fire access paths on the roof must not be blocked by panels per Thai fire code. Insurance premium discount available for arc fault detection + rapid shutdown systems.
How to Verify Warranty Terms Before Signing
Don't rely solely on the EPC proposal summary — verify the actual manufacturer warranty documents. These 6 checks prevent costly problems later.
Request the actual warranty document — not just the EPC proposal summary
Check warranty registration process — some manufacturers require online registration within 30-90 days of installation; miss it and warranty may be void
Verify the warranty applies in Thailand — some manufacturers have geographic restrictions
Understand shipping/labor costs for claims — "free replacement panel" may not include shipping from China or labor to swap it
Check force majeure exclusions — some warranties exclude "acts of God" which could include Thai floods/storms
For PPA: Verify the PPA contract specifies what insurance the provider must carry and what happens if they don't
A proper monitoring system provides critical evidence for warranty claims. See the solar monitoring guide to choose the right system for your factory.
Insurance Checklist for Factory Solar Projects
Use this checklist as a reference before and after solar installation — every item should be checked off before the system goes live.
EPC contractor has valid EAR/CAR policy (request certificate before installation starts)
EPC contractor's third-party liability covers damage to your factory during installation
Post-commissioning: OAR or property insurance extension in place before DLP expires
Solar system value explicitly declared in property insurance policy
Lightning and electrical surge coverage included (not excluded in fine print)
Business interruption coverage considered (if factory revenue depends on solar savings)
Annual insurance premium budgeted in ROI model (0.2-0.5% of system value)
Warranty certificates filed and registered with manufacturers
Performance monitoring system installed to enable warranty claims
5-year inverter warranty expiry tracked (inverters often have shorter warranty than panels)
Frequently Asked Questions
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