Start with the event pattern
Record the exact event code, inverter model, time, duration, generation, site load and weather. Note whether every inverter or phase is affected and whether the event occurs at similar times on clear days. Monitoring data can establish a pattern, but it is not automatically a calibrated electrical measurement.
Name every measurement point
A voltage reading only makes sense when its location, phase, method, time and operating condition are recorded. Measurements at the inverter terminals, main switchboard and connection point answer different questions. The AC voltage rise worksheet compares two entered readings without pretending to issue a compliance verdict.
Electrical measurements and switchboard access are licensed-worker tasks. Record instrument identification and test conditions in the evidence log. Do not send an owner to operate isolators or open equipment to collect data.
Separate the site from the network
Voltage at an inverter reflects both the incoming supply and changes across the site’s AC circuit while exporting. A structured investigation compares named points under documented conditions, checks the installation and protection arrangement, and then determines whether DNSP escalation is supported. It does not jump from an app screenshot to a network conclusion.
Keep settings changes out of diagnosis
Grid response and protection settings exist to satisfy current connection requirements. Western Power’s guidance states that existing approvals remain tied to their conditions and that changing export or generation limits can require a new application. Never widen or defeat a setting simply to keep an inverter online. Preserve settings as found, approval details and every authorised change.
Prepare an escalation pack
- Connection approval, supply and phase details.
- Exact inverter events and a timestamped recurrence pattern.
- Measurements at clearly named points and conditions.
- Relevant circuit and equipment details.
- Monitoring exports kept distinct from instrument readings.
- Installer assessment and the specific question for the DNSP.
The grid-overvoltage playbook provides the safe sequence for packaging that evidence.