The four things that control the outcome
Pin this down first. A wrong starting assumption makes every later step weaker.
Verify the variable that can change the decision instead of relying on a headline claim.
Keep the record, measurement, statement, photo or calculation that proves what happened.
Finish with a verifiable result—not a verbal promise, temporary screen state or assumption.
Stress-test the decision before you commit
Solar earthing and surge-protection checklist for homeowners: verify design, labels, commissioning records and safe inspection points without DIY live electrical work.
Model the roof, not the brochure
Separate the physical system from the sales estimate. Record twelve months of electricity use where available, daytime consumption, usable unshaded roof, orientation, sanctioned load, exact module and inverter models, protection equipment, expected downtime and the current DISCOM or scheme process.
| Layer | Evidence | Decision question |
|---|---|---|
| Site | Roof plan, shade, cable route | Can the proposed array physically perform here? |
| Design | Module/inverter models, string layout | Are the electrical assumptions internally consistent? |
| Economics | Generation assumption, self-use, export value | Does payback survive a conservative case? |
| Handover | Serials, tests, warranties, portal records | Can you prove what was installed and commissioned? |
Failure test
Reject a comparison that depends on guaranteed subsidy, perfect generation, unnamed equipment or a full advance before milestone evidence. A dominant solar decision is auditable from bill to roof to meter.
Evidence pack
Keep the newest authoritative document, the transaction or event timeline, your calculation or diagnostic result, screenshots or photos where relevant, and every complaint or service reference in one dated folder. Redact passwords, OTPs and unnecessary sensitive identifiers.
What success looks like
The case is not finished when somebody says it is fixed. Close it only when the authoritative record matches the expected outcome: the corrected statement or report, confirmed filing status, updated portal, working device, released document, settled claim, completed meter/installation record, or written closure confirmation.
Use this as an owner’s verification checklist, not a wiring guide. Ask for the as-built diagram, protection schedule and commissioning records; match them to what was installed; and use qualified personnel for electrical testing. Solar DC can remain energised in daylight even when the AC supply is off.
Review solar electrical safety without turning it into a DIY high-voltage job
1. Ask for the single-line diagram and protection schedule
You should be able to see how modules, strings, inverter, AC connection, isolation, earthing and surge-protection devices fit together.
2. Match the design to the installation
Model numbers, cable routes, isolators, protection devices and earthing conductors on site should correspond to the approved design or a documented as-built drawing.
3. Request test and commissioning records
Ask what electrical tests were performed, who performed them, the instruments or standards used, and the signed acceptance record.
4. Inspect visually from safe locations
Look for damaged enclosures, loose visible conduits, exposed conductors, water ingress or corrosion. Do not open inverter or DC combiner compartments unless qualified and authorised.
5. Escalate defects before normal operation
If protection is missing, visibly damaged or undocumented, obtain qualified inspection and written remediation instead of improvising a repair.
What earthing and surge protection actually do
Earthing provides a controlled protective path and helps exposed conductive parts remain at safer potentials under fault conditions. Surge protective devices limit transient overvoltage reaching equipment. They solve different problems, and neither substitutes for correct cable sizing, isolation, overcurrent protection, lightning-risk design or workmanship.
The exact arrangement depends on inverter type, system architecture, local electrical rules, the building’s lightning-protection system and manufacturer requirements. A generic internet diagram should not be used as an installation drawing.
The handover documents that make safety maintainable
| Record | What it lets you verify | Red flag |
|---|---|---|
| Single-line or as-built diagram | How DC and AC sides connect and where protection sits | No drawing, or drawing does not match the site. |
| Equipment schedule | Exact inverter, module, isolator and protection models | Undocumented substitutions. |
| Earthing/protection test record | What was tested at commissioning and by whom | Only a verbal “earthing is done.” |
| Warranty and datasheets | Installation constraints and replacement compatibility | No serial numbers or accessible terms. |
| Shutdown instructions | How authorised persons isolate the system safely | No labelled isolation points or owner instructions. |
Questions to ask the installer instead of guessing a resistance number
- Which earthing arrangement did you design for this site, and why?
- How does the inverter manufacturer require protective earthing to be connected?
- What surge-protection devices are installed on the DC and AC sides, and what design basis was used?
- Does the building have an existing lightning-protection system, and was coordination reviewed?
- What commissioning tests were performed, and can I have the signed results?
- What inspection interval does the manufacturer or installer recommend for this exact system?
Safe owner checks
You can verify labels, documentation and obvious physical condition without touching live parts. From safe access points, look for broken conduits, loose external cable supports, cracked enclosures, obvious water entry, heavy corrosion, burn marks or repeated inverter protection faults. Photograph changes over time for service personnel.
After lightning, flooding, roof work or a major surge
Do not automatically restart a visibly damaged system. Roof work can disturb bonding, conduits or module wiring; water can affect enclosures; and a surge can damage protective devices without an obvious external failure. Ask for a targeted inspection and keep the service report.
For a warranty or workmanship dispute, preserve the original design, as-built drawing, commissioning records, dated photos, inverter logs and the technician’s written diagnosis.
Official escalation
Technical safety should be handled by a qualified professional first. If the unresolved issue concerns paid installation work or promised documentation, preserve the quote, invoice, handover commitments and photos. The National Consumer Helpline is an official consumer grievance route.