Free inverter & string inspection checklist
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Free solar inverter and DC string inspection checklist (PDF-ready). Cabinet focus: MPPT, isolation, AC output and faults to AS/NZS 5033 and IEC 62446-1.
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Updated 18 May 2026
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What is a inverter & string inspection checklist?
An inverter and string inspection is an electrical-cabinet focused check of the solar inverter and the DC strings feeding it, distinct from the modules-on-roof inspection of the panels themselves. The technician verifies each DC string is delivering the expected open-circuit voltage and operating current to its MPPT (maximum power point tracker), the inverter is producing the expected AC output to the grid, the DC and AC isolators operate cleanly, the earth and surge protection devices are intact, and the inverter event log holds no unresolved fault codes. The procedure is the routine that solar farm operations and maintenance (O&M) teams and rooftop PV installers run between formal annual services to keep system yield close to the projected production curve.
The checklist is anchored in AS/NZS 5033 (Installation and safety requirements for PV arrays), IEC 62446-1 (Photovoltaic systems requirements for testing documentation and maintenance), AS 4777.2 (Grid connection of energy systems via inverters) and NFPA 70 Article 690 (Solar photovoltaic systems) used in the United States. Where the solar-panel-inspection-checklist covers the array (module cracks soiling shading mounting and frame), this template stays inside the cabinet, the string combiner and the connection to the grid. Typical findings include MPPT mismatch from a single underperforming string, DC isolator pitting, surge arrester cartridges expired by a lightning event, electrolytic capacitor venting in the inverter, fan failure, AC voltage rise on rooftop systems and earth fault interrupter trips. Operators use the signed checklist as audit evidence for the Clean Energy Council accredited installer scheme, for the warranty position with the inverter OEM, and as the data feed that drives the next annual service or component replacement.
Learn more about maintenance and work orders in MapTrack.
Benefits of using this inverter & string inspection checklist
- MPPT optimisation: identifying a single underperforming string against the others restores the 2 to 8 percent annual energy production typically lost to a soiled or shaded string that the modules-on-roof inspection misses.
- Electrical safety verification: isolator operation earth continuity surge arrester cartridge state and AC voltage rise checks keep the system compliant with AS/NZS 5033 and the Clean Energy Council installation guidelines.
- Fire-risk reduction: pitted DC isolators loose terminations and damaged combiner-box wiring are the leading causes of rooftop PV fires the inspection catches them before failure.
- Grid response defence: AS 4777.2 and IEEE 1547 grid-support functions (volt-watt volt-var ramp limits) are verified at the inverter so the system stays connected during minor grid events.
- Warranty defence: a documented inspection record aligned to IEC 62446-1 is the evidence inverter OEMs expect on every warranty claim particularly for AC-side faults and fan motor failures.
- Yield reporting accuracy: capturing inverter AC output against the modelled production curve calibrates the asset owner monthly yield report and underwrites the next maintenance budget decision.
Benefits of digitising forms in MapTrack
When you digitise solar inverter checklists in MapTrack, you get:
- Field users can easily scan a QR code to complete a form on mobile. Unlimited users.
- Automatically get alerts when faults are identified.
- Link every form digitally as a PDF to the relevant asset, location or person.
- Receive a digital PDF copy with every submission to your email.
- Ability to share forms digitally.
- Build conditional logic (show or hide questions based on answers).
- Take pictures or attach photos. Not possible with a paper-based form.
- Electronic signatures.
- Edit forms later without reprinting.
- Restrict permissions (who can view, complete or approve).
- Build forms with AI (describe what you need and MapTrack suggests the form).
- Trigger work orders automatically when a fault is logged during an inspection.
- Track service intervals by hours, kilometres or calendar date in one place.
- Attach supplier invoices and parts receipts to each maintenance record.
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What to include in a inverter & string inspection checklist
This inverter & string inspection checklist covers 10 key areas:
- System identification: site address PV system size (kW DC) inverter make and model serial commissioning date Clean Energy Council certificate number inspector electrical licence and current inverter firmware version.
- Permit isolation and PPE: AC isolator off DC isolator off lockout-tagout on both isolators verified zero potential with a rated multimeter at the inverter AC and DC terminals and arc-flash gloves rated for the DC voltage.
- DC string measurement: open-circuit voltage (Voc) per string against the manufacturer datasheet operating current (Imp) per MPPT and comparison between parallel strings on the same tracker.
- Combiner box and string protection: combiner fuse condition string-level DC isolator terminal torque sample DC surge arrester cartridge state and DC overcurrent device coordination.
- Inverter electrical cabinet: AC contactor wear DC link capacitor venting cooling fan operation IGBT heatsink condition firmware version and protection setpoint verification.
- Inverter event log: last 90 days of warnings and faults isolation faults islanding events earth fault trips temperature derating events and grid-frequency disturbances.
- AC side and grid connection: AC isolator operation AC terminal torque sample residual current device test main switchboard interface and the AS 4777.2 voltage rise from the inverter to the point of supply.
- Earth and surge protection: earth continuity from the inverter chassis to the main earth electrode AC and DC surge arrester counter and equipotential bonding to the array frame.
- Environmental and physical: inverter ventilation clearance dust ingress in the heatsink moisture in the cabinet vermin entry and labelling compliance.
- Sign-off: defect list severity escalation path owner target close-out date inspector signature and electrical licence number.
How to use this inverter & string inspection checklist
- Plan the visit and review remote monitoring before site access: pull the last 90 days of inverter event log AC output yield curve and any soiling or shading events identified by the monitoring portal agree the inspection scope with the asset owner pre-stage arc-flash gloves a clamp meter and an insulation tester and bring the manufacturer firmware version notes.
- Isolate the inverter and verify zero energy: switch the AC isolator off switch the DC isolator off apply lockout-tagout to both isolators wait for the inverter capacitors to discharge per the manufacturer cool-down period and verify zero potential at the inverter AC and DC terminals with a rated multimeter before opening any cover.
- Measure DC strings and inspect the combiner box: at the combiner box record the open-circuit voltage (Voc) per string against the manufacturer datasheet and against parallel strings on the same MPPT inspect each string fuse for fatigue check terminal torque on a sample basis inspect each DC string isolator for arc damage and check the DC surge arrester cartridge state.
- Inspect the inverter electrical cabinet and event log: open the inverter cabinet check AC contactor wear DC link capacitor venting cooling fan operation and IGBT heatsink dust load verify firmware version against the OEM bulletin and protection setpoints download the inverter event log and screenshot the last 90 days of warnings faults islanding events and temperature derating periods.
- Verify AC side earth and grid response then close out: re-energise to a known safe state test the residual current device measure AS 4777.2 voltage rise from the inverter to the point of supply confirm grid-support functions enabled (volt-watt volt-var ramp limits) check earth continuity from the inverter chassis to the main earth electrode submit the signed checklist defect register and inverter event log evidence pack.
In MapTrack, you can schedule and track maintenance digitally. Each submission is stored as a timestamped PDF against the asset record.
Get the free templateEnter your email above to download the full inverter & string inspection checklist as a PDF.Back to download formHow often should you complete this checklist?
Solar inverter and string inspections are best run at a six-monthly cadence on commercial and utility-scale systems and at an annual cadence on residential rooftop systems unless monitoring data suggests an earlier intervention. Remote monitoring runs continuously through the inverter portal and triggers ad-hoc visits for individual fault codes (islanding events temperature derating earth fault trips). A six-monthly inspection (this checklist) walks the cabinet to verify items the monitoring portal cannot see: DC isolator condition surge arrester cartridges fan dust load and terminal torque. An annual service replaces filters fans and consumables and recertifies the protection settings. Major component replacement (capacitor bank fan motor display board) is scheduled against operating hours or condition. AS/NZS 5033 and the Clean Energy Council guidelines anchor the safety-critical cadence for DC isolation and earth continuity. MapTrack six-monthly and inverter-fault triggers automate the next inspection across every site in the portfolio.
Frequently asked questions
Applicable regulatory standards
This template aligns with the following regulations and standards:
- AS/NZS 5033:2021 (Installation and safety requirements for PV arrays)
- IEC 62446-1:2016 (PV systems requirements for testing documentation and maintenance)
- AS 4777.2:2020 (Grid connection via inverters)
- AS/NZS 3000:2018 (Wiring rules)
- NFPA 70 Article 690 (Solar photovoltaic systems)
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<p style="font-size:12px;font-weight:700;letter-spacing:0.05em;text-transform:uppercase;color:#0E7490;margin:0;">Free template</p>
<p style="font-size:18px;font-weight:700;color:#071D49;margin:6px 0 0;">Inverter & string inspection checklist</p>
<ul style="margin:12px 0 0;padding-left:18px;color:#374151;font-size:14px;line-height:1.6;">
<li style="margin:4px 0;">System identification: site address PV system size (kW DC) inverter make and model serial commissioning date Clean Energy Council certificate number inspector electrical licence and current inverter firmware version.</li>
<li style="margin:4px 0;">Permit isolation and PPE: AC isolator off DC isolator off lockout-tagout on both isolators verified zero potential with a rated multimeter at the inverter AC and DC terminals and arc-flash gloves rated for the DC voltage.</li>
<li style="margin:4px 0;">DC string measurement: open-circuit voltage (Voc) per string against the manufacturer datasheet operating current (Imp) per MPPT and comparison between parallel strings on the same tracker.</li>
<li style="margin:4px 0;">Combiner box and string protection: combiner fuse condition string-level DC isolator terminal torque sample DC surge arrester cartridge state and DC overcurrent device coordination.</li>
<li style="margin:4px 0;">Inverter electrical cabinet: AC contactor wear DC link capacitor venting cooling fan operation IGBT heatsink condition firmware version and protection setpoint verification.</li>
<li style="margin:4px 0;">Inverter event log: last 90 days of warnings and faults isolation faults islanding events earth fault trips temperature derating events and grid-frequency disturbances.</li>
</ul>
<p style="font-size:13px;color:#6B7280;margin:14px 0 0;padding-top:12px;border-top:1px solid #E5E7EB;">Free <a href="https://www.maptrack.com/templates/inverter-string-inspection-checklist" style="color:#071D49;font-weight:600;text-decoration:none;">Inverter & string inspection checklist</a> by MapTrack</p>
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