Stone island villa, Elounda
Elounda Ridge, 72053 Elounda, Crete, Greece
€2,650,000
Contemporary stone villa above the Gulf of Mirabello. Efficient envelope and heat pump already in place; Crete's 1,700 kWh/kWp yield and outage-prone island grid make solar-plus-storage the decisive upgrade.
- Living area
- 340 m²
- Rooms
- 8
- Built
- 2016
- Occupants modelled
- 6
- Heating
- Heat pump
- Region
- Crete
Site & energy profile — Crete
Solar conditions
- South-facing flat roof terraces, ballasted 15° array
- 170 m² usable roof area
- 1,700 kWh/kWp regional yield · 3% shading derate
- Modelled at 1,649 kWh/kWp → 46,667 kWh/yr from 28.3 kWp
Load drivers
- Infinity pool with heating and counter-current pump
- Heat pump heating and cooling across 340 m² and a guest house
- Peak occupancy of six through the July–August season
- Borehole irrigation pump and outdoor lighting
Resilience context
Autonomous Cretan island grid — summer peaks and occasional outages.
Autonomous Cretan grid with summer-peak outages: whole-villa backup and generator hand-over are essential for guest seasons.
Indicative storage for this profile: 29 kWh.
Home Energy IQ summary
Home Energy IQ score
Elounda Ridge, Elounda, Crete
Crete · 1,649 kWh/kWp modelled yield
Energy demand
65 kWh/m²a
Running cost
€6,713/yr
CO₂ footprint
13.68 t/yr
Potential after retrofit
Indicative annual saving
€5,547
Highest-impact next step
Rooftop solar PV
≈ €6,821/yr saved · payback 6.0 yrs
Recommended Home Energy IQ system
Island location with a high resilience requirement.
Modelled retrofit plan
Modelled for this Crete property at 1,649 kWh/kWp, with a €45,000 indicative budget and a resilience and independence objective. Adjust the assumptions in the simulator to model your own scenario.
Annual saving
€5,547
Net investment
€44,735
incl. €600 subsidies
Simple payback
8.1 yrs
CO₂ avoided
11.11 t/yr
Your recommended Home Energy IQ configuration
ISLAND ENERGY 30+
Why this fits your property
- A 340 m² property using about 32,582 kWh of electricity a year sits inside the ISLAND ENERGY 30+ band (Sized to site load and outage profile).
- Your roof in Crete supports roughly 32,980 kWh of production a year, which the 15–20 kW inverter and 30–60 kWh battery are sized to use rather than export.
- A heat pump, pool circulation, EV charging and a separate guest house push the evening load up, so storage is sized above the entry system.
- Island or weak-feeder supply with reported outages makes whole-home backup the deciding factor, not just savings.
Projected solar production
32,980 kWh/yr
20 kWp · 1,649 kWh/kWp in Crete
Self-powered
64%
Catalogue range 80–100%
Estimated backup
9.2 h
Whole-home comfort loads at ≈2.6 kW
Indicative investment
from €34,900
≈ €368/month over 10 years, excl. VAT
All figures are indicative model estimates for comparison, based on the details you entered. Production, self-powered share and backup duration depend on real weather, occupancy and tariffs. Nothing here is a quotation or a guaranteed performance figure.
Included in this configuration
- Solar PV
- 15–20 kWp
- Battery
- 30–60 kWh LFP
- Hybrid inverter
- 15–20 kW three-phase
- Generator
- Optional / recommended
- Connectivity
- Ethernet + Wi-Fi + 4G fallback
- Whole-home backup
- Automatic generator start
- Battery recharge from generator
- Smart load shedding
- 4G monitoring
- Remote reset
Indicative installed price. Final pricing is subject to property survey, electrical infrastructure, grid connection, roof conditions and final engineering design.
Step 3 · Configure upgrades
Optional improvements
Your system works without any of these. They are shown because something in your inputs suggests they could be worth discussing at the assessment.
EV CHARGE
Charges the car on surplus solar instead of peak-tariff grid power — typically €300–€600 a year on the mileage assumed here.
You reported an electric vehicle.
Charge power and savings depend on your vehicle, tariff and daily driving pattern.
V2H READY
Prepares the electrical architecture so the vehicle could later support the house during an outage.
Only worth adding while the installation is being designed — retrofitting is more disruptive.
Actual vehicle-to-home operation depends on vehicle compatibility and applicable regulation.
SMART VILLA
Adds circuit-level metering and automatic load shifting, so the pool pump, heat pump and boiler run on solar rather than at night.
A pool pump is one of the largest shiftable loads on this property.
Circuit visibility requires CT clamps at the distribution board; without them, circuit values are estimated.
GENERATOR BACKUP
Extends backup from hours to days by starting automatically and recharging the battery when an outage runs long.
Island or remote supply with outages long enough to outlast a battery.
Requires a suitable generator, fuel storage and a site survey; sizing is confirmed at assessment.
CONNECTIVITY+
Keeps monitoring and alerts working through a dedicated gateway with 4G backup when broadband drops.
Remote properties frequently lose fixed-line connectivity before they lose power.
Coverage depends on the mobile network at the property.
BATTERY CAPACITY UPGRADE
Adding around 75 kWh of storage would carry more of your evening load and lift the modelled self-powered share by roughly 5–10 points.
Modelling puts you near 64% self-powered, at the lower end of this system's range.
Battery expansion is confirmed against your measured consumption profile at the technical assessment.
ENERGY CARE
Continuous monitoring, alerts and an annual performance review so underperformance is caught early rather than at year end.
Recommended for every installation; can be added or dropped later.
A recurring service subscription, separate from the installed system price.
Step 4 · Payment options
≈ €331.62/month
10% deposit (€3,490) · 10 years · 4.90% p.a. illustrative rate
Modelled energy saving
€462.25/month
Net +€130.63/month
Illustrative repayment estimate only — not a credit offer, quotation or approval. It assumes an indicative 4.90% annual rate, equal monthly instalments and the indicative system price before VAT and any subsidy. Actual terms depend on the lender, your circumstances and the final assessed price.
Step 5 · Confirm with an assessment
Confirm your Home Energy IQ plan
A site assessment validates roof and mounting, the electrical panel and connection, permitting requirements and the final price. Everything above stays an indicative model until an engineer has seen the property.
Your plan so far
- · Recommended system: ISLAND ENERGY 30+ (Energy Resilience) — from €34,900 excl. VAT, indicative
- · Property profile: Crete · 20 kWp modelled at 1,649 kWh/kWp
- · Modelled outcomes: 32,980 kWh/yr solar · 64% self-powered · ≈9.2 h backup (Whole-home comfort loads)
- · Options to discuss: base configuration only
- · Financing interest: not reviewed yet
Prefer to read first? Detailed financing calculator · How assessments work
Today
65 kWh/m²a
€6,713/yr · 13,684 kg CO₂
After recommended plan
61 kWh/m²a
€1,166/yr · 2,578 kg CO₂
Projected class movement
Cumulative saving over 10 years (with 3% annual energy price inflation): €63,590
What your recommended system delivers
Every line below is delivered by ISLAND ENERGY 30+ or one of its optional Home Energy IQ modules — ranked by impact per euro against your goal and budget.
Rooftop solar PV
Generates power at roughly a third of grid price for 25+ years.
Delivered by your recommended Home Energy IQ system
- Net cost
- €41,035
- Saving/yr
- €6,821
- Payback
- 6.0 y
Smart energy manager & hydronic balancing
Cheapest measure per euro saved and the data layer for everything that follows.
Optional add-on: SMART VILLA module
- Net cost
- €1,800
- Saving/yr
- €213
- Payback
- 8.5 y
Smart EV charger (11 kW)
Charges on surplus solar instead of peak-tariff grid power.
Optional add-on: EV CHARGE module
- Net cost
- €1,900
- Saving/yr
- €74
- Payback
- 25.7 y
Catalogue options outside your budget
Home battery storage
Shifts midday solar into evening use and raises self-consumption to ~70%.
Delivered by your recommended Home Energy IQ system
- Net cost
- €25,580
- Saving/yr
- €1,462
- Payback
- 17.5 y
All figures shown are indicative estimates generated from standardised building models and average market prices. They are not a certified energy performance assessment, an engineering report, or financial advice. Actual savings, costs, subsidies and payback depend on an on-site assessment of your property.
All figures shown are indicative estimates generated from standardised building models and average market prices. They are not a certified energy performance assessment, an engineering report, or financial advice. Actual savings, costs, subsidies and payback depend on an on-site assessment of your property.