Domakihub How to Install Solar Panels and Cut Your Energy Bill
A practical step-by-step guide for Greek homes, holiday rentals, and small hotels.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 6 min read
Greece ranks among the sunniest countries in Europe, making solar panels one of the most financially sound upgrades you can make to a home, holiday rental, or small hotel. The video above walks through the full DIY installation process; this article distills the key steps, adds Greece-specific context — permits, grid regulations, and typical costs — and helps you decide how much to tackle yourself versus hand to a certified electrician. Whether you own a villa in the Peloponnese or an apartment block in Athens, the fundamentals are the same.
Why Solar Makes Particular Sense in Greece
Greece receives between 2,500 and 3,000 hours of sunshine per year — roughly double the European average. That means a correctly sized rooftop system can cover 70–100 % of annual household electricity consumption in most regions, with surplus energy sold back to the grid under the net-metering scheme (net-metering) administered by HEDNO (ΔΕΔΔΗΕ).
Energy costs in Greece have risen sharply since 2021, and the national subsidy programme 'Exoikonomo' has periodically co-funded solar retrofits for primary residences. Holiday-rental owners on islands such as Crete, Rhodes, and Corfu often achieve payback within 5–7 years thanks to high summer generation coinciding with peak rental demand.
Professional Installer or DIY?
In Greece, connecting a photovoltaic system to the public grid legally requires a licensed electrical engineer (ηλεκτρολόγος μηχανικός) to sign off the technical file and submit it to HEDNO. Even capable DIY installers must therefore involve a professional for the grid-connection stage. What you can reasonably do yourself — reducing labour costs — is mount the racking, run conduit, and position the panels before the electrician arrives for the AC wiring and commissioning.
For off-grid or hybrid systems (common on remote islands or rural properties), the regulatory pathway is simpler and more of the work can stay in-house. Either way, check with your local HEDNO district office before purchasing equipment, as approved equipment lists and feed-in tariffs are updated regularly.
5 Steps to Installing Solar Panels
- 1
Assess Your Site and Calculate System Size
Start by gathering your last 12 months of electricity bills to find your annual kWh consumption. Then survey your roof: note the pitch, the compass orientation (south-facing surfaces are ideal in Greece), and any shading from neighbouring buildings or trees between 9 am and 3 pm. A south-facing roof at 25–35 degrees delivers maximum annual yield. Divide your annual consumption by your location's peak sun hours (roughly 5 h/day for most of Greece) to estimate the kilowatt-peak (kWp) capacity you need. A typical three-bedroom home in Athens needs 4–6 kWp; a large holiday villa may need 8–12 kWp.
- 2
Obtain Permits and Grid Approval
Submit a connection application to HEDNO (the distribution network operator) through their online portal or your regional office. You will need a site plan, a single-line electrical diagram, and proof of property ownership. HEDNO issues a connection offer within 40 days for small systems (up to 10.8 kWp) under the simplified net-metering track. Once accepted, your licensed electrical engineer registers the system with DEDDIE and arranges the bidirectional meter installation. Budget 4–8 weeks for this bureaucratic stage — start it before ordering panels so equipment arrives just as approvals land.
- 3
Install the Racking and Mount the Panels
Fix aluminium rail brackets to your roof rafters using stainless-steel lag bolts; always seal penetrations with EPDM-rubber flashing to prevent leaks. Slide the rails onto the brackets, then clip the panels into the mid-clamps and end-clamps supplied with your racking kit. Work from the bottom row upward, keeping all panels in a single plane. On flat roofs common on Greek island buildings, use ballasted (non-penetrating) tilt frames set to 25–30 degrees — the optimal tilt for southern Greece. Two people working together can typically mount a 10-panel (4 kWp) array in a single day.
- 4
Wire the Panels and Connect the Inverter
String your panels in series or series-parallel depending on your inverter's input voltage window — follow the manufacturer's wiring diagram precisely. Run UV-resistant DC cable from the roof to the inverter location (usually inside a utility room or shaded outdoor cabinet). Connect the string(s) to the inverter's DC input terminals, then have your licensed electrician run the AC output cable to the main distribution board and install the required AC disconnect switch and generation meter. Never work on DC wiring alone in bright sunlight — panels produce voltage the moment light hits them; cover them with an opaque tarp before handling connectors.
- 5
Commission the System and Monitor Performance
Once HEDNO's engineer installs the bidirectional smart meter, your electrician powers the inverter for the first time and verifies AC voltage, frequency, and anti-islanding protection. Log into the inverter's monitoring app (most modern string inverters include cloud monitoring) and confirm each panel is producing within 5 % of its rated output. Set up alerts for zero-production events — a common early sign of a loose MC4 connector or a failing bypass diode. Record your first month's generation figure as a baseline; in Greece, a 5 kWp south-facing system should produce roughly 700–800 kWh in its first full summer month.
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FAQ
- Do I need planning permission to install solar panels on my home in Greece?
- For most residential rooftop systems up to 10.8 kWp, a simplified notification to your local urban-planning office (rather than a full building permit) is required, in addition to the HEDNO grid-connection application. Properties in listed areas, traditional settlements, or archaeological buffer zones may face stricter rules — always verify with your local planning authority (Πολεοδομία) before installation.
- How long does a solar panel installation take from start to finish?
- Physical installation of the racking and panels typically takes 1–3 days for a standard 4–8 kWp residential system. The bottleneck is bureaucracy: the HEDNO connection approval and smart-meter swap can add 6–12 weeks in total. Plan the full project timeline as 2–4 months from first permit application to first exported kilowatt-hour.
- What is net metering and how does it work in Greece?
- Under Greece's net-metering scheme, any electricity your panels generate but your household does not consume in real time is exported to the grid and credited to your account. At the end of each settlement period (usually one year), your utility subtracts the exported kWh from the imported kWh on your bill. If you export more than you consume, the surplus credit carries forward — you are not paid cash for it. Systems up to 10.8 kWp for residential accounts and up to 500 kWp for commercial accounts qualify.