What is often overlooked in quick installations
At the peak of the boom, time was of the essence: crew, roof, panels, invoice. Elements that were most often "saved on" — consciously or not:
- surge protection device (SPD) on the DC and AC side — this is what absorbs surges after nearby lightning strikes; without it, a storm can take out the inverter, and sometimes even home electronics;
- earthing and equipotential bonding of the structure — aluminium rails on the roof should be included in the earthing system;
- quality of MC4 connectors — a poorly crimped connector is the most common point of failure and heating;
- cable routing — sharp sheet metal edges, lack of roof penetration covers, cables "just touching" the covering;
- documentation — diagram, DC and AC side measurement protocols. If you don't have them, it's a sign that measurements might not have been done at all.
What a PV installation inspection covers
- visual inspection of panels, structure, and cable routes (from the roof, not from the pavement);
- checking and tightening connections, assessment of connectors;
- measurements: DC side insulation resistance, continuity of earthing and equipotential bonding, AC side parameters;
- SPD verification — whether they are present, correctly selected, and not already "worn out" (SPD inserts require replacement after activation);
- inverter readout: error history tells more than many a visit;
- protocol with recommendations — also for home insurer requirements.
When an inspection makes sense
After every major storm or hailstorm, with a noticeable drop in yields, after inverter error messages — and periodically, every few years, even when "everything is working". Photovoltaics is an electrical installation on the roof, operating in rain, frost, and heat — it deserves the same standard as an installation inside the house.
Where this is heading: storage and energy management
Increasingly, we are adding energy storage and self-consumption control to PV — the direction is visible even in public investments (an example from our area: the modernisation of the Wodny Centrum Rekreacji in Świebodzice included PV, energy storage, and heat pumps — according to the report on the state of the commune for 2025). If you are thinking about expansion, it is worth first sorting out the foundation: measurements, SPD, earthing — and only then installing further devices.
Inverter reporting an insulation fault? Don't clear the alarm "until it works" — this is a message about a real current leakage, most often on the DC side. This is a signal for measurement, not for a restart. Book a PV installation inspection.
