Are You Getting the Solar Output You Paid For? 12-18% Energy Loss? Don’t Let Your PV Modules Undercut Your ROI

The difference between a high-performing solar project and a financial liability often comes down to one overlooked factor—module quality. Studies from NREL show that one fifth of PV modules surveyed degraded by more than 1.0% per year, well above current guarantees of 0.5% per year. The impact? Millions in lost revenue and underperforming assets that fail to meet financial expectations.

Despite this evidence, many developers and asset owners assume their modules are delivering the power they paid for—without verifying performance before commissioning. Are you one of them?

The High Cost of Unverified Module Performance

The industry is filled with cautionary tales of solar developers who discovered module performance issues too late:

• Mismatched Module Bins Cost Millions – Without batch QA testing, developers are left to rely on manufacturer-provided data, which can mask performance discrepancies that only become evident after installation. A PV-Tech report highlights how performance mismatches in large-scale projects can shrink expected revenue and cause PPA underperformance.
• Degradation Can Exceed Expected Rates – While most financial models assume a 0.5% annual degradation rate, field data shows that some module batches degrade much faster. A Power Magazine analysis found that certain modules lost up to 2% of output in the first year alone—crippling project economics. Further, degradation modes such as UVID in new technologies can reduce output fast enough to disrupt commissioning.
• Renegotiation Leverage is Lost Without Data – Once modules are installed, your ability to challenge performance discrepancies disappears. Batch QA testing before commissioning allows developers to verify that modules meet contractual obligations and, if necessary, renegotiate MSAs before it’s too late.

How GroundWork’s Batch QA Testing Puts You in Control

With independent, third-party testing, GroundWork helps you avoid costly surprises and maximize your project’s financial success:

• Verify True Module Performance – Accurate flash testing, PAN file generation, and reference module calibration ensure real-world output matches expectations.
• Reduce Degradation Risks – We test for LID, LeTID, UVID, PID, mechanical strength, and environmental resilience to confirm that modules meet financing and warranty terms.
• Strengthen Your Negotiating Power – Know exactly what you’re getting before commissioning and avoid being locked into underperforming modules.
• Optimize Long-Term Asset Performance – Align modeled vs. actual degradation rates to protect your financial models and PPA terms.

Unlock the Full Potential of Your Solar Investment

The difference between a profitable solar asset and a financial drain starts with module quality assurance. If you’re not independently verifying module performance before installation, you’re leaving money on the table.

Ready to elevate your solar project? Contact us today at sales@grndwork.com.

Article written by Colin Sillerud, Director of Reliability Testing, GroundWork Renewables, Inc.