Solar & Battery Maintenance, Inspection & Repair

Guidance, not advice. General information on looking after a solar and battery system after it's installed — not tailored technical or compliance advice. Regulations, standards and manufacturer requirements change. Last updated May 2026; check current rules and use a qualified professional for your own system.‍‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‍

This is the after-install side of solar: operations, maintenance, fault-finding and repair for people who already have a system (or are about to). If you're still choosing an installer, start with Becoming a Solar PV Installer.

What solar O&M actually covers

Operations — monitoring performance, spotting faults, tweaking settings (time-of-use tariffs, battery charge windows).
Maintenance — scheduled checks, cleaning where appropriate, tightening terminations, firmware updates, testing safety devices.
Inspection and fault-finding — site visits when something's wrong (no generation, tripping breakers, poor output, error codes).
Repair and warranty support — swapping failed components and helping navigate the manufacturer's or installer's warranty process.
Recurring-revenue contracts — annual or multi-year service plans that bundle the above into a predictable fee.

It's separate from installation, but often done by the same kind of company — ideally you want an installer who also offers ongoing O&M.

What actually goes wrong

Solar PV: complete loss of generation (inverter failure, AC isolator, a tripped breaker, or a grid-side problem); one string or module underperforming (a string disconnection, an MC4 connector, a broken module, or new shading from tree growth or a structure); intermittent tripping (RCD/MCB under certain weather or temperature, often loose terminations or insulation faults); water ingress and DC insulation faults (poorly terminated connectors, damaged cables); and hot spots or damaged connectors (a poor crimp, often only visible on a thermal camera).

Battery and hybrid: a battery not charging or discharging when expected (misconfigured settings, a firmware bug, the wrong tariff, or CT clamps installed incorrectly); error codes or lost communication between inverter and battery (CAN/RS485 problems, firmware mismatch, a failed BMS board); and rapid capacity loss (genuine degradation versus a misreported state of charge — which needs diagnosis and sometimes a manufacturer test).

How a good provider diagnoses (measurement, not guesswork)

Remote — review the inverter portal data, compare expected versus actual generation and battery behaviour, and look at when the problem started (is it weather-related?).
On-site DC — visually inspect modules, cabling and roof penetrations; test each string (open-circuit voltage and short-circuit current against design); use IV-curve tracing or thermal imaging for tricky faults.
On-site AC — inspect isolators, breakers, RCDs and switchboard integration; check earthing, bonding and that protection devices are correctly rated and labelled.
Inverter and battery — read and interpret error codes and logs; check firmware, communication cables and CT clamps; and verify the grid-connect settings against AS/NZS 4777.2 and the local network (DNSP) requirements. A good service measures before it quotes a repair.

Inspection regimes and safety

Commissioning — the testing, certificates and sign-off the installer should have done at handover.
Periodic inspections — visual condition of modules, mounts and fixings; integrity of DC cabling, conduit, connectors and junction boxes; DC insulation-resistance and continuity testing; functional tests of DC and AC isolators, RCDs and overcurrent protection; and correct labelling and signage (see Construction Standards Register).
Context — state electrical-safety rules set the baseline, homeowners and landlords may have duties under state electrical-safety law, and commercial sites often need documented periodic inspection and test reports for insurers and the network operator.

Warranty — who's responsible for what

Product warranties (modules, inverters, batteries) cover defects in the product, but often require correct installation, registration and proof of maintenance — and a manufacturer may want fault data, photos and test results before approving a swap. Workmanship warranties cover how the system was put together (wiring, mounting, terminations, sealing) and come from the installer for a fixed period — if the installer has stopped trading, recourse is limited. An O&M provider earns its keep here: diagnosing whether a fault is product or workmanship, preparing the evidence, and removing and reinstalling components for a claim (often chargeable even when the part itself is free).

Maintenance contracts (the recurring-revenue play)

Annual service visit — one inspection, test and written report a year, with add-ons like panel cleaning or thermal imaging.
Monitoring + reactive call-out bundle — continuous portal monitoring with agreed response times (remote triage in 1-2 working days, a site visit within a week where needed) and a discounted labour or fixed call-out rate.
"All-in" plans for landlords and commercial portfolios — multiple systems under one agreement, regular reports for insurers and compliance, and priority response.

Be explicit about scope — what's included (routine tests, monitoring, basic settings) versus chargeable extra (major repairs, access equipment, replacement hardware). Price it as a real service line (see Setting Your Charge-Out Rate).

The DIY line (a safety one)

A customer can reasonably check the app for error messages, compare generation to past output, and look for obvious damage from the ground. Everything else — DC connectors, roof work, opening enclosures, insulation testing, firmware or grid-parameter changes — is for a licensed installer or O&M firm. PV DC strings can be live and dangerous even when the AC side is isolated, so customers must never dismantle or rewire anything.

Common mistakes

Quoting a repair before measuring (string tests, IV curve, error logs).
Forgetting the grid-connect settings must match AS/NZS 4777.2 and the DNSP, not an overseas profile.
Selling a maintenance contract with fuzzy scope (what's included vs chargeable).
A customer attempting DC-side or roof work themselves.

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