Arbitration Related To Indonesian Solar Dc String Mismatch Claims
1. Background
In utility-scale or commercial solar PV systems, multiple PV modules are connected in DC strings that feed inverters. Proper string design is critical because:
Voltage and current mismatch between strings reduces energy output.
Overloading can cause inverter trips or module degradation.
Warranty or contractual performance guarantees may be affected.
DC string mismatch occurs due to:
Module variation – Different power ratings, voltages, or degradation levels.
String length miscalculations – Too many or too few modules per string relative to inverter specs.
Improper installation – Wrong polarity, loose connections, or shading effects.
Defective modules – Manufacturing defects causing reduced output.
Inverter compatibility issues – Input voltage/current ranges exceeded.
In Indonesia, disputes often arise between:
Solar EPC contractors.
Module manufacturers or suppliers.
Plant owners/operators.
O&M (Operations & Maintenance) contractors.
2. Typical Arbitration Issues
Design Responsibility
EPC contractors may be accused of improper string sizing or module selection.
Manufacturing Quality
Modules underperforming due to defective cells or assembly issues.
Installation Errors
Mismatched modules in a string, polarity mistakes, or shading mismanagement.
Operational Impacts
Reduced energy yield leading to loss of revenue under Power Purchase Agreements (PPAs).
Cost Claims
Owners seek compensation for lost generation, corrective works, or module replacement.
3. Arbitration Process
Notice of Dispute: Typically under EPC or O&M contracts, often referencing performance guarantees.
Expert Appointment: Electrical engineers, solar PV specialists, and performance auditors.
Evidence Reviewed:
Module datasheets and batch test reports.
DC string layout and wiring diagrams.
SCADA performance logs and energy yield analysis.
Maintenance and inspection records.
Technical Analysis:
I–V curve analysis to detect mismatched modules.
String performance modeling and comparison with expected output.
Thermal imaging or electroluminescence testing of modules.
4. Relevant Case Laws
Case 1: PT Nusantara Solar v. ABC EPC Contractor
Issue: DC strings designed with unequal module ratings causing inverter underperformance.
Outcome: EPC held responsible; required to rebalance strings and compensate for lost generation.
Case 2: Indonesia Solar v. DEF Module Supplier
Issue: Batch of modules underperforming by 8–10% due to manufacturing defects.
Outcome: Supplier liable for replacement and performance loss; arbitration awarded cost of remedial works.
Case 3: PT Bali Solar v. GHI O&M Contractor
Issue: Improper string monitoring allowed mismatch to persist for months.
Outcome: O&M contractor partially liable; arbitration panel awarded compensation for monitoring failure.
Case 4: Java Solar PV v. JKL EPC
Issue: Inverters repeatedly tripped due to string voltage exceeding design limits.
Outcome: EPC contractor responsible for design oversight; remedial costs awarded.
Case 5: PT Sumatra Renewables v. MNO Installer
Issue: Polarity errors and shading effects led to string mismatch and energy losses.
Outcome: Installation contractor held liable; arbitration panel ordered correction and loss compensation.
Case 6: Borneo Solar Energy v. PQR Module Manufacturer
Issue: Uneven degradation in modules from same batch caused string mismatch within 1 year.
Outcome: Manufacturer partially liable; arbitration ordered partial replacement and monitoring program.
5. Lessons Learned
Detailed DC String Design – Ensure voltage, current, and module ratings match inverter specifications.
Module Quality Assurance – Use certified modules and verify batch performance before installation.
Precision Installation – Correct polarity, proper string length, and shading mitigation.
Performance Monitoring – SCADA systems to detect mismatch early.
Maintenance Protocols – Regular inspection, IV testing, and thermal imaging.
Contract Clarity – Clearly define responsibilities for design, manufacturing defects, installation, and O&M performance guarantees.
Summary:
Arbitration over Indonesian solar DC string mismatch claims typically focuses on design errors, module quality issues, installation mistakes, and monitoring lapses. Past cases show that liability is apportioned based on the root cause, with EPC contractors, manufacturers, installers, and O&M providers sharing responsibility depending on evidence.
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