Mistake 1: Undersizing DC Cables
DC cables carry current from panels to the inverter. Undersized cables create resistive losses — the electricity your panels generate is partially converted to heat instead of delivered to your home. In Cyprus's hot climate, where cables may run across roof surfaces reaching 60 °C or more, this problem compounds.
What to look for: Your specification should state cable cross-section (typically 4 mm² or 6 mm² for residential strings). Ask your installer to confirm this in writing and verify it matches what arrives on site.
Mistake 2: No Surge Protection
Cyprus has a notable summer thunderstorm season, particularly from late September through November. A direct or nearby lightning strike can send a voltage surge through your system, destroying the inverter and potentially causing a fire.
Surge protection devices (SPDs) on both the DC and AC sides of the inverter are a low-cost addition that is often omitted on budget installations.
What to look for: The installation specification should include DC-side and AC-side SPDs. Check whether they are listed in the components section of your quote.
Mistake 3: Panels Installed in Avoidable Shade
Chimneys, water tanks, satellite dishes, and parapet walls are common on Cypriot rooftops. Installing panels directly in the shadow cone of these obstructions is an elementary error that immediately reduces yield.
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A competent installer will conduct a shading analysis using software like Helioscope or the Solargis Prospect tool, and will move, reorient, or split strings to minimise shading impact. If your quote arrives without any shading analysis documentation, ask for one.
Mistake 4: Wrong Tilt Angle for a Flat Roof
On a flat roof, the installer must set the tilt using mounting frames. The optimal tilt for Cyprus is 20–25° facing south. Some installers default to steeper angles (35–40°) out of habit from European markets where they trained. In Cyprus, this reduces annual yield by 3–4 % and increases wind loading on the frame unnecessarily.
What to look for: The installation design should specify the tilt angle and azimuth, and show a predicted annual yield from a modelling tool.
Mistake 5: Poor or Missing Earthing
Proper electrical earthing connects the metal frame and components of the system to earth potential, protecting against electric shock and reducing surge damage. In Cyprus, the sandy and rocky soil can make achieving a low earth resistance more challenging. Skimped earthing is an inspection failure and a safety risk.
What to look for: Cyprus electrical regulations (aligned with EU standards) require a system earth. Ask for the post-installation inspection certificate, which should include an earth resistance measurement.
Mistake 6: No Monitoring Set Up
A system installed without monitoring configured is a system that can fail silently. Inverter faults, tripped breakers, and degraded strings may go unnoticed for months — costing significant lost generation before the annual EAC bill reveals something is wrong.
What to look for: Confirm that the installer will register the system on the inverter's cloud platform (mySolarEdge, iSolarCloud, FusionSolar, Enlighten, or Solar.web) and hand you login credentials at handover.
Mistake 7: No Written Yield Estimate
A professional installer should produce a site-specific annual yield estimate — not a rough verbal promise. Without this, you have no baseline against which to measure underperformance.
What to look for: A written yield estimate (in kWh/year) from modelling software, stating the assumptions used (irradiance source, degradation rate, system losses).
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Mistake 8: Ignoring Salt Proximity for Coastal Properties
Homes within 1–2 km of the coast in Limassol, Paphos, or Larnaca are exposed to salt aerosol. Salt corrodes panel frames, junction boxes, and mounting hardware over time. Marine-grade components rated for C3 or C4 corrosion categories are more expensive but significantly longer-lasting.
What to look for: If your property is coastal, confirm that mounting hardware is hot-dip galvanised or stainless steel, and that panels are rated for salt-mist exposure.
Quick Checklist Before Signing
- Written specification with component model numbers
- Cable cross-section stated (min 4 mm²)
- Surge protection included (DC and AC sides)
- Shading analysis conducted and documented
- Tilt and azimuth appropriate for roof type and Cyprus latitude
- Annual yield estimate from recognised modelling tool
- Monitoring platform included and configured at handover
- Marine-grade hardware if within 2 km of coast
- Installer holds valid MECI electrical contractor licence