Solar panel repair: what can be fixed and what cannot

A solar PV panel can be repaired when the fault is outside the laminate: junction box, bypass diodes, connectors, cables or frame, all of which are mature repairs (TRL 9) according to IEA-PVPS. Ecobaterías carries out these repairs in Chile and tests every module before and after with insulation, I-V curve and electroluminescence measurements. Broken glass, delamination that reaches the edge and burnt cells cannot be fixed: those modules go to recycling with a certificate.

We do not repair inverters or solar thermal collectors (the ones that heat water or pools): this page covers photovoltaic modules only, which generate electricity. Looking to repair a battery? See lithium battery repair.

Which solar panel faults can be fixed?

A repair corrects a specific fault and the module goes back to its original job. Three tests come up throughout this page: insulation (the electrical resistance between the module’s circuit and its frame, measured dry and with the module wet, which is called the wet leakage test), the I-V curve (the current–voltage relationship that gives the maximum power) and electroluminescence or EL (an image of the energized module in the dark, where microcracks and inactive cells show up dark).

The table summarizes each fault according to the IEA-PVPS T13-37 report (2026), which reviewed repair techniques for used modules. TRL is the technology readiness level: TRL 9 is a mature technique and TRL 3–4 an experimental one.

Swipe to see the full table

Sources: IEA-PVPS T13-37:2026, Table 1 · IEA-PVPS T13-01:2014 · IEC 61215-1:2021, clause 8 · output tests per the Ecobaterías protocol · 2026-09-26

Junction box and bypass diodes

The junction box is the plastic box bonded to the back of the module, where the cables come out. It holds the bypass diodes: each one protects a group of cells (a substring) and lets current flow around that group when it is shaded or damaged, so that it does not overheat.

A diode fault can be found without opening the panel. The open-circuit voltage (Voc) is measured with a multimeter: if it matches the nameplate, the substrings are healthy; if it reads 2/3, 1/3 or zero, one, two or three substrings are disconnected or bypassed. Each diode is then tested in forward and reverse bias (IEA-PVPS T13-37:2026).

We replace the diode or the whole box, re-solder the contacts and reseal. This can be done on site, without dismounting the module. According to Suncycle, a mobile repair workshop at a plant handles up to 120 modules per day, with a success rate of about 90% on recent modules and 75% on heavily aged ones. Modules repaired after a diode failure kept between 93% and almost 100% of their nameplate power, which is why they are graded by power again (IEA-PVPS T13-37).

A melted box can come from a shorted diode or an undersized one: those were the typical cases in a Solreed campaign in France, with 158 modules inspected, repaired and tested (IEA-PVPS T13-37). IEC 62979:2017, written mainly for Schottky diodes, tests whether the diode, as mounted, survives the switch from forward to reverse bias without thermal runaway.

MC4 connectors and cables

MC4-type connectors join the direct-current cables between modules. Chile’s electricity and fuels regulator, the SEC (Superintendencia de Electricidad y Combustibles), requires MC4 or equivalent connectors that meet IEC 62852 and IEC 60998-1, polarized, latching and protected from the sun (SEC Technical Instruction RGR No. 02/2024, §9).

IEC 62852 tests pairs of connectors of the same type and manufacturer. Mating different brands has no certification and creates a risk of electric arcing and fire (Stäubli). The SEC asks installers to avoid that mix and, where there is no alternative, to justify and document compatibility.

We replace the damaged cable or connector with matched pairs from the same manufacturer and record the model in the report. It is a mature repair (TRL 9) and, unlike the others, it does not require a wet leakage test (IEA-PVPS T13-37). We still measure dry insulation and the I-V curve.

Aluminum frame

A detached or bent frame is replaced in a workshop: the repair is mature (TRL 9), but the module has to be dismounted (IEA-PVPS T13-37). Continuity between the frame and its grounding point is then measured, with a criterion of 0.1 Ω or less (IEC 61730-2, MST 13), followed by the wet leakage test.

Can a solar panel backsheet be repaired?

The backsheet is the plastic sheet that covers the back of the module and insulates it. It accounts for more than 40% of material defects: cracking, delamination and yellowing (IEA-PVPS T13-37:2026).

There are two techniques: a flowable silicone or two-component polyurethane coating (TRL 7; the module often has to be taken down) and an adhesive tape or sheet (TRL 9; applied on site). In one documented case, coated modules had run for 30 months with no electrical changes and no inverter trips due to leakage (IEA-PVPS T13-37).

Limits: it cannot be repaired when the cracking comes with chemical degradation and delamination, like the square cracks in some polyamide backsheets. Nor do we consider it repaired if, after sealing, wet insulation does not reach 40 MΩ·m². As a cost reference, an Australian National University (ANU) mass-scale reuse project sealed backsheets with silicone at AUD 25.5–29.5 per module (pv magazine, 2026-08-13).

PID: partial recovery

PID (potential-induced degradation) is the power loss caused by the voltage difference between the cells and the grounded frame. It shows up in electroluminescence taken at low current, one tenth of the short-circuit current (Isc), which reveals shunts (current leaks inside the cell) and PID (IEA-PVPS T13-10:2018).

Recovery uses reverse voltage at night, heat or, for polarization-type PID, UV light. It is not complete: efficiency comes back almost fully at high irradiance, but not at low irradiance or in shunt resistance (Scientific Reports, 2022). We measure before and after and report how much was recovered.

The IEC TS 62804-1:2025 specification added a UV recovery test for polarization-type PID. It covers crystalline silicon modules and excludes thin film, tandem and heterojunction (HJT): we do not offer PID recovery on those modules.

What cannot be fixed and goes to recycling?

• Cracked or broken glass. With broken glass, insulation is no longer guaranteed, especially in humid conditions, and hot spots and corrosion appear (IEA-PVPS T13-01:2014). Glass repair resins are experimental (TRL 3–4). The SEC prohibits installing modules with breaks or cracks (RGR No. 02/2024, §8). We neither repair nor sell modules with broken glass.
• Delamination to the edge. IEC 61215 treats it as a major visual defect when it forms a continuous path between the electrical circuit and the edge of the module.
• Burnt cells, encapsulant or backsheet. These are also major visual defects. In thermography, a cell more than 40 K hotter than its neighbors is a safety-relevant anomaly (class 3 of IEC TS 62446-3:2017).
• Internal ribbons and solder joints. Repairing them means opening the backsheet, soldering and resealing: it is experimental (TRL 3–4), slow and hard to scale. We do not offer it.
• Thin-film modules (CdTe, CIGS). We do not repair them; they go to recycling.
• Inverters. We do not repair inverters; that repair belongs with the manufacturer or its service network.

Measure before discarding: snail trails follow microcracks in the cells and a hot spot can come from shade or dirt, so power and electroluminescence decide (IEA-PVPS T13-01).

For modules that cannot be fixed, we collect, receive and manage their recycling, and issue an intake, traceability and valorization certificate for your reporting under Chile’s Extended Producer Responsibility law (Ley REP, Law No. 20,920). According to Chile’s Ministry of Energy, a disused or damaged panel is handled as hazardous waste unless it is declassified under Supreme Decree (DS) 148/2003 (Circular Economy in Energy Roadmap). Details in solar panel recycling in Chile.

How we repair: a six-step protocol

1. Request with photosYou send us the brand, model and nameplate power, number of modules, observed fault, location and photos of the label and the damage. We reply within 48 business hours.
2. Visual inspectionWe check every module under at least 1,000 lux (IEC 61215-2, MQT 01): glass, frame, backsheet, junction box, burn marks and delamination. We record the serial number, model and nameplate.
3. Input test and decisionWe measure dry insulation, Voc and diodes, the I-V curve and electroluminescence. With those values we decide whether the module is repaired or goes to recycling, and we tell you before any work starts.
4. RepairWe replace diodes, junction boxes, cables, connectors or frames; we seal the backsheet with a coating or tape, or apply PID recovery, depending on the fault.
5. Output testWet leakage test on every module with a repair other than cables or connectors (40 MΩ·m² or more), I-V curve corrected to standard test conditions, electroluminescence and frame continuity.
6. Label and reportAn additional label, without covering the original nameplate, with the measured power and the repairs made, in line with the reuse label proposed in the IEC PAS 63525 draft. A per-module report with input and output values and the power class.

In the lab, testing takes 6 minutes per module, not counting the repair: 50–100 modules per day. That is lab capacity, not a committed lead time; the lead time of each repair is confirmed in the quote.

Which tests are done after a repair?

A repaired panel has to prove again that it is safe and how much power it delivers. These are the tests and criteria we use; each technique is covered in detail in solar panel testing. Standard test conditions (STC) are 1,000 W/m² of irradiance and a cell temperature of 25 °C.

Swipe to see the full table

Sources: IEC 61215-2:2021, official preview · insulation and wet leakage thresholds (Millennial Solar) · IEC 60904-1 · IEC 60891:2021 · IEC TS 60904-13:2018 · IEA-PVPS T13-10:2018 · IS/IEC 61730-2 · classes P1, P2 and P3: Ecobaterías protocol, not a standard · 2026-09-26

Measuring insulation only when dry is not enough. In 37 modules from utility-scale plants, 8.1% failed dry insulation and 21.6% failed it wet (Sustainability, 2026). In an Australian mass-scale reuse project, 331 of the 2,200 modules that reached the wet leakage test failed it (15%), and about three in four failures appeared within the first 10 seconds (pv magazine, 2026-08-13).

Can a repaired panel be connected to the grid in Chile?

The SEC authorizes modules by brand and model, based on IEC 61215 and IEC 61730 certificates for the new product (SEC Exempt Resolution No. 32,427/2020; RGR No. 02/2024, §8). There is no SEC route to authorize used, repaired or refurbished modules as such, and RGR No. 02/2024 prohibits installing modules with breaks or cracks.

That is why a repaired module keeps its brand, model and original nameplate. RGR No. 02/2024 requires the nameplate to remain visible and indelible, with Voc, Vmp, Isc, Imp, Pmax and maximum system voltage, and the module to have bypass diodes and an IP65 rating. The installation declared to the SEC is defined by the authorized electrical installer. Before connecting a repaired module to the grid, we recommend checking with the SEC.

The first IEC document on module reuse, IEC PAS 63525, is still in approval (project status) and, according to the summary of its draft in IEA-PVPS T13-37, junction box replacement will be addressed in more detail in future documents. We do not present repair as a certification: we deliver a documented test.

Off-grid use: the SEC’s ITG RIC No. 9.1/2021 also requires authorized models. Class P3 modules (70–80% of nameplate power) are intended for uses that are not grid-connected, such as pumping, irrigation, remote sites and backup, subject to whatever the SEC requires.

Manufacturer warranty: according to Chile’s Ministry of Energy, manufacturers’ warranties generally do not allow modules to be repaired or reused. If your panel is still under warranty, check with the manufacturer first.

Three outcomes for a faulty panel

Source: P1, P2 and P3 classes from the Ecobaterías test protocol, measured under a solar simulator with a calibrated reference; an in-house classification, not a standard · 2026-09-26

If the batch comes from a repowering project, see solar plant repowering; if you have decommissioned modules to test and sell, see solar panel reuse. All battery and panel services are listed under services.

Why is my solar panel not charging?

A simple measurement points the diagnosis in the right direction before you request a repair. Caution: the panel generates voltage under any light and only stops when covered with an opaque material; do not handle a module with broken glass or exposed cables without protection (JinkoSolar installation manual).

Swipe to see the full table

Sources: IEA-PVPS T13-37:2026, §2.2.1 · IEA-PVPS T13-37:2026, Table 1 · IEC TS 62446-3:2017 · 2026-09-26

How much does solar panel repair cost?

The price is confirmed in the quote. It depends on:

• the type of fault and the number of modules;
• whether the repair is done on site or in a workshop (the frame and some coatings require dismounting);
• spare parts: diodes, box, cables and connectors from the same manufacturer;
• the output tests (wet leakage applies to almost every repair);
• pickup and transport, if the batch travels to Santiago.

Repair pays off when the module still holds its power and its model is no longer made: an identical replacement for older components is unlikely to be available (SolarPower Europe), and the SEC restricts mixing modules with different characteristics in the same generating unit (RGR No. 02/2024, §8). As an international reference, sealing backsheets with silicone cost AUD 25.5–29.5 per module in the ANU project.

Before pickup: how to handle damaged panels

• Lift each module with two people, by the short side, and never by the junction box.
• Do not step on the modules or put loads on them. Store them dry, flat and protected from rain and sun.
• A module with broken glass or exposed cables can give an electric shock: do not clean or handle it without protection.
• Cover the front with an opaque material: it is the only way to stop it from generating voltage.

Sources: JinkoSolar, storage instructions (2024-04-29) · JinkoSolar, installation manual V11 (2026-05-12)

We coordinate pickup with licensed hazardous-waste transport anywhere in Chile. If a module is going to repair and is not waste, it can travel as general cargo; if it is already waste, it travels with that licensed transport. Details in battery and solar panel collection and transport.

Regulatory framework

• Law No. 20,920: preparing for reuse means checking, cleaning or repairing a discarded product so that it can be used again without any other processing (art. 3 No. 18). It counts as valorization, just like recycling (art. 3 No. 30).
• Supreme Decree (DS) 22/2025: collection and valorization targets for photovoltaic modules, enforceable from May 2028: 10% in the third year (2030) and 50% from the tenth (2037), measured against the estimated waste of the year.
• Supreme Decree (DS) 148/2003: according to the Ministry of Energy, a disused or damaged panel is handled as hazardous waste unless it is declassified.
• SEC: module authorization by brand and model (Exempt Resolution No. 32,427/2020); module and connector requirements for grid-connected systems (RGR No. 02/2024) and off-grid systems (ITG RIC No. 9.1/2021).
• IEC 61215, IEC 61730, IEC 60891, IEC TS 60904-13, IEC TS 62446-3, IEC TS 62804-1 and IEC 62852: reference standards for the test method. They are not certifications we hold.

Sources: Law No. 20,920, Library of the National Congress of Chile · DS 22/2025, Official Gazette, 2026-05-07 · Ministry of Energy, Circular Economy in Energy Roadmap 2026–2030 · 2026-09-26

Frequently asked questions

Can a solar panel be repaired?

Yes, when the fault is outside the laminate: junction box, bypass diodes, connectors, cables or frame. These are mature repairs (TRL 9 according to IEA-PVPS) and, except for the frame, they can be done on site. A cracked backsheet can sometimes be sealed. Broken glass, delamination to the edge and burnt cells are not repaired. Every repaired module is tested before and after.

Can a cracked or shattered solar panel be repaired?

No. With broken glass, electrical insulation is no longer guaranteed, especially in humid conditions, and hot spots and corrosion appear. Glass repair resins are experimental (TRL 3–4). In addition, Chile’s SEC prohibits installing modules with breaks or cracks in grid-connected systems. A shattered panel is removed and goes to recycling with a certificate.

Does a broken solar panel still work?

It may still produce some power, but it is not safe: with broken glass, moisture gets into the module and there is a risk of electric shock and fire. The panel also generates voltage under any light and only stops when it is covered with an opaque material. Cover it, do not handle it without protection and send it to recycling.

How do you repair a burnt solar panel?

It depends on where the burn is. If it is in the junction box, often from a shorted or undersized diode, the diode or the box is replaced and the module goes through a wet leakage test. If the burn is in the cells, the encapsulant or the backsheet, IEC 61215 treats it as a major visual defect and the module goes to recycling.

How much does solar panel repair cost?

It depends on the fault, the number of modules, whether the repair is done on site or in a workshop, the spare parts and the output tests. The price is confirmed in the quote and we reply within 48 business hours. As an international reference, an Australian National University mass-scale reuse project sealed backsheets with silicone at AUD 25.5–29.5 per module.

Can the diode or the junction box be replaced?

Yes. The diode or the whole box is replaced, the contacts are re-soldered and the box is resealed; this can be done without dismounting the module. According to Suncycle, cited by IEA-PVPS, the success rate is about 90% on recent modules and 75% on heavily aged ones. A wet leakage test is required afterwards and the power is measured again.

How do you repair a solar panel cable?

The damaged cable or connector is replaced and MC4-type connectors are fitted in matched pairs of the same type and manufacturer: mating different brands has no IEC 62852 certification and creates an arcing risk. Chile’s SEC requires connectors that meet IEC 62852 and IEC 60998-1. The module’s insulation and I-V curve are measured afterwards.

Why is my solar panel not charging?

Measure the open-circuit voltage (Voc) and compare it with the nameplate. If it reads 2/3 or 1/3, one or two substrings are disconnected or bypassed, and the diodes and junction box need checking. If Voc is correct but the current is low, check for shade, dirt, broken cells or PID. If the panel measures fine, the fault may be in the charge controller, the inverter or the battery.

What do I do with a panel that cannot be fixed?

Do not throw it away or leave it outdoors: according to Chile’s Ministry of Energy, a disused panel is handled as hazardous waste unless it is declassified under Supreme Decree (DS) 148/2003. We collect, receive and manage the recycling of solar panels, with pickup coordinated with licensed hazardous-waste transport and a valorization certificate for your EPR report.

More answers in the FAQ, and technical terms in the glossary.

Sources

Updated September 26, 2026 · Reviewed by the Ecobaterías technical team