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Ref. a1b2c3d4 · 16/10/2026
Section 1
01 Executive summary
The key results of your study, at a glance.
System size6.0kWp
Generation6,960kWh/year
Installation cost11,400€
Savings · year 1820€
Chosen configuration
Panels
15 × 400 Wp · Standard monocrystalline
Area
≈ 39.0 m²
Orientation · pitch
South · 30°
Shading
5 %
Inverter
Central inverter (string)
Mounting
On the roof (on-roof mounting)
Home battery
7.5 kWh
The year's energy balance
Your generation · 6,960 kWh
Used on site 3,312 kWh · 48 %
Exported to the grid 3,648 kWh
Your consumption · 5,200 kWh
From your panels 3,312 kWh · 64 %
Bought from the grid 1,888 kWh
Self-consumed3,312kWh
Surplus exported to the grid3,648kWh
Self-sufficiency64%
Net gain · 25 years16,555€
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Section 2
2c Site panel layout and shading
Theoretical layout of the PV array and distant shading profile of the horizon.
Panel layout · 15 panels (5 × 3)
No roof drawn: the diagram below is a theoretical layout on a reference rectangle. Draw your roof in the simulator to get the aerial view of your building with the panels in their actual position.
Number of panels
15
Arrangement
5 × 3 (portrait)
Array dimensions
5.75 × 5.21 m
Individual panel
1.72 × 1.13 m
Roof orientation
South
Tilt
30°
Theoretical layout diagram, not contractually binding. The actual layout (number of rows, spacing, service walkways, frames) must be validated on site by the installer.
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Section 2 · continued
2c Site panel layout and shading
Horizon shading profile
Terrain / horizonSummer sunWinter sun
0°max. elevation 70°
The bluish area shows the terrain that hides the sun (hills, distant buildings). This distant shading is already deducted from the irradiance data used for the calculation: it does not need to be added separately. Nearby obstructions (trees, chimneys, neighbouring buildings) come on top of this and are counted separately.
−5% was applied to this installation; the exact source was not recorded for this simulation.
Source of irradiance and terrain data: PVGIS 5.3 (JRC, European Commission).
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Ref. a1b2c3d4 · 16/10/2026
Section 1b
1b Consumption profile
Breakdown of your annual electricity consumption as analysed during the consumption calculation.
Consumption source: estimated standard profile (no actual consumption curve imported).
Total consumption
5,200kWh/year
Annual bill
1,231€/year
Standing charge
190€/year
Contract type
Base
Subscribed power
6kVA
Monthly consumption
560
280
0
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Breakdown by use
Use
kWh/year
Share
Heating
1,800
35 %
Domestic hot water
800
15 %
Household appliances
680
13 %
Audio-visual and IT
680
13 %
Lighting
620
12 %
Other uses
620
12 %
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Ref. a1b2c3d4 · 16/10/2026
Section 1c
1c Understanding your consumption
Which uses solar can really cover, and which call for other measures.
Solar compatibility by use
Use
Compatibility
When?
Share
Heating
Poor match
Winter, outside solar hours
35 %
Domestic hot water
Partial
All year, schedule for 11:00–16:00
15 %
Household appliances
Partial
Can be scheduled during the day
13 %
Audio-visual and IT
Poor match
Mostly in the evening
13 %
Lighting
Poor match
Morning and evening, worse in winter
12 %
Other uses
Partial
Varies by appliance
12 %
Key takeaways
01Main use
35 %1,800 kWh a year, the household's largest use
Heating
Electric heating is used in winter and outside solar hours. Solar alone covers only a small share of it, so your installation should not be sized to cover this use. To cover part of it, you would need a much more powerful installation and a home battery to reach the evening peaks.
02Warning
35%of your consumption goes to heating
Do not size for heating
Heating accounts for 35% of your consumption and is concentrated in winter, when solar production is at its lowest and outside sunshine hours. In fact, 40% of your electricity is consumed over the winter months (Nov.–Feb.). Trying to cover it would require an oversized installation plus an expensive battery, for a sharply reduced return. Size your installation on your daytime uses instead; heating is better addressed through insulation and efficient equipment (heat pump).
03Your profile
10:00–16:00the window for running your appliances
Away during the day: shift your uses
Your profile indicates absence during solar production hours. Without action, a large share of your production would be fed into the grid at a low price rather than self-consumed. Schedule your appliances (water heater, washing machine, vehicle charging) for the 10:00–16:00 window, either manually with their timers or automatically with home automation (smart plugs, energy manager).
04A no-investment lever
+140 €/yearin extra savings
Schedule your appliances for the day
Your flexible uses (domestic hot water, household appliances) can be scheduled: moving them to solar hours (10:00–15:00) directly increases your self-consumption, without a home battery. In your case, this scheduling is worth about 140 €/year in additional savings.
05Evening uses
25%of your consumption after sunset
Only a home battery covers them
Around 25% of your consumption (lighting, audio-visual, evening cooking) takes place after sunset. Solar alone cannot cover these uses: only a home battery can store the day's surplus and release it in the evening. As a guide, a 7.5 kWh home battery would provide +180 €/year, cost 6,500 € incl. VAT, payback ~14 years (see the Battery storage page for details).
In summary
Solar is not a universal solution: it excels at daytime uses (refrigeration, air conditioning, schedulable appliances) but covers winter heating and evening uses poorly. A well-sized installation first aims to maximise self-consumption of your daytime uses; trying to cover everything leads to oversizing and a weaker return.
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Ref. a1b2c3d4 · 16/10/2026
Section 2
02 Generation and consumption by month
Green areas show the months when generation exceeds consumption. Source: PVGIS 5.3 (JRC, European Commission), TMY 2005–2019.
GenerationConsumptionSolar surplus
880
440
0
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Average hourly profile: your typical day
Average generation and consumption, hour by hour. Choose a season (and, where relevant, a battery capacity) to see the effect on your typical day.
GenerationConsumption
🔋 Home battery:
Smoothed hourly averages over the PVGIS typical year. The battery simulation is daily and indicative (module degradation of ≈ 0.5%/year is not shown here).
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Ref. a1b2c3d4 · 16/10/2026
Section 3
03 Self-consumption optimisation
By scheduling your household appliances for the hours of high solar generation (10:00–16:00), you can significantly increase your self-consumption rate.
Indicator
Current scenario
Optimised scenario
Gain
Self-consumption
47.6 %
62.0 %
+14.4 %
Self-sufficiency
64.0 %
78.0 %
+14.0 %
Annual savings
820 €
1,040 €
+220 €/year
Gain over 25 years
—
—
+4,200 €
Optimisation potential
By scheduling your appliances for the solar hours, you generate 220 € extra per year, or 4,200 € over 25 years.
Appliances to schedule first (10:00–16:00)
Appliance
Recommendation
Impact
Hot water / water heater
Solar timer 12:00–15:00: absorbs the surplus
High impact
Washing machine
Schedule between 11:00 and 15:00
Moderate impact
Dishwasher
Start at 13:00, solar peak
Moderate impact
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Section 4
04 Home battery storage
Analysis of several home battery capacities for your set-up. The 7.5 kWh home battery is recommended.
Capacity
7.5kWh
selected
Self-cons.
58 %
Self-sufficiency
74 %
Cost incl. VAT
7,500€
Recommended optimal capacity: 7.5 kWh
Estimated price: 7,500 € incl. VAT. This capacity offers the best ratio between the self-consumption gain and the extra cost of the home battery for your consumption profile.
Capacity comparison
Capacity
Self-consumption
Self-sufficiency
Extra savings/year
Price incl. VAT
5 kWh
52 % (+4.4)
68 % (+4.0)
+160 €
5,800 €
7.5 kWh ★ Recommended
58 % (+10.4)
74 % (+10.0)
+220 €
7,500 €
10 kWh
62 % (+14.4)
79 % (+15.0)
+265 €
9,200 €
12.5 kWh
65 % (+17.4)
82 % (+18.0)
+295 €
11,000 €
15 kWh
67 % (+19.4)
85 % (+21.0)
+310 €
12,500 €
Gains calculated by hourly simulation over 8,760 h.
Financial impact of the home battery
Additional home battery investment: 7,500 €. The self-consumption gain slightly lengthens the overall payback period but increases your independence from the grid.
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Ref. a1b2c3d4 · 16/10/2026
Section 5
05 25-year financial projection
Scenario shown: 7.5 kWh home battery
Net investment: 18,900 € · Degradation 0.5%/year · Price increase +3%/year · Home battery replacement in year 13
Year
Generation
Gains / year
Costs
Cumulative
Cumulative balance
Year 1
6,960
1,040 €
− €
1,040 €
-17,860 €
Year 2
6,925
1,066 €
− €
2,106 €
-16,794 €
Year 3
6,891
1,092 €
− €
3,198 €
-15,702 €
Year 4
6,856
1,119 €
− €
4,317 €
-14,583 €
Year 5
6,822
1,147 €
− €
5,464 €
-13,436 €
Year 6
6,788
1,176 €
− €
6,640 €
-12,260 €
Year 7
6,754
1,205 €
− €
7,845 €
-11,055 €
Year 8
6,720
1,235 €
− €
9,080 €
-9,820 €
Year 9
6,686
1,266 €
− €
10,346 €
-8,554 €
Year 10
6,653
1,297 €
− €
11,643 €
-7,257 €
Year 11
6,620
1,329 €
− €
12,972 €
-5,928 €
Year 12
6,587
1,362 €
− €
14,334 €
-4,566 €
Year 13🔋 Replacement
6,554
1,396 €
− €
10,855 €
-8,045 €
Year 14
6,521
1,431 €
− €
12,286 €
-6,614 €
Year 15
6,488
1,466 €
− €
13,752 €
-5,148 €
Year 16
6,456
1,503 €
− €
15,255 €
-3,645 €
Year 17
6,424
1,540 €
− €
16,795 €
-2,105 €
Year 18
6,391
1,579 €
− €
18,374 €
-526 €
Year 19✓ Payback
6,360
1,618 €
− €
19,992 €
+1,092 €
Year 20
6,328
1,658 €
− €
21,650 €
+2,750 €
Year 21
6,296
1,699 €
− €
23,349 €
+4,449 €
Year 22
6,265
1,741 €
− €
25,090 €
+6,190 €
Year 23
6,233
1,785 €
− €
26,875 €
+7,975 €
Year 24
6,202
1,829 €
− €
28,704 €
+9,804 €
Year 25
6,171
1,874 €
− €
30,578 €
+11,678 €
Estimated home battery replacement in year 13 (65% of the initial price).
Net gain over 25 years
11,678€
Payback
19years
LCOE
0.070€/kWh
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Ref. a1b2c3d4 · 16/10/2026
Section 6
06 Financing
Scenario shown: 7.5 kWh home battery
Item
Amount
Installation price incl. VAT
11,400 €
7.5 kWh home battery incl. VAT · VAT 20%
+ 7,500 €
Net investment
18,900 €
VAT at 5.5% up to 9 kWp, if the panels are certified and an energy manager controls at least two appliances. A battery is still invoiced at 20% on its own line.
Advanced financial indicators
NPV (5%)7,500 €over 25 years
Net wealth in today's euros. A positive NPV confirms profitability.
IRR9.8 %per year
Equivalent to a financial investment at 9.8% a year for 25 years.
How to pay for it
Same savings in all three cases. Simulator starting assumptions: loan at 5.5% over 10 years, first rental offer available. They are adjusted on the results page.
Mode
Outlay
Per month
Cost
Payback
NPV 5%
Net gain 25 years
Cash purchaseBest gainOwner from day one
18,900 €
0 €balance +87 €/month
—
year 19
−3,058 €
+11,028 €
Loan10 years at 5.5%, down payment 0 €, insurance 0.3%, owner
0 €
210 €/monthbalance −123 €/month
6,281 €
year 23
−3,601 €
+4,747 €
RentalNot comparable with this scenario: published rents cover panels, not a battery. Enter the rent from your quote on the results page (“Other” offer).
—
—
—
—
—
—
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Ref. a1b2c3d4 · 16/10/2026
Section 7
07 Environmental impact
Your contribution to the energy transition over the lifetime of the system.
Your system over 25 years
9.1 t of CO₂ avoided
or about 362 kg avoided each year
What this means in practice
🌳
Equivalent trees
411
planted over 25 years
Car km avoided
75,417
combustion-car km over 25 years
Households supplied
2.9
households / year, in energy terms
Share of consumption covered by solar
Annual solar coverage
64 %
0%25%50%75%100%
Methodology: Calculations based on the emission factor of the French electricity mix: 52.0 g CO₂e/kWh (source: ADEME, the French environment and energy agency, Bilan Empreinte®). One tree absorbs an average of 22 kg of CO₂ per year. Combustion-engine car: 120 g of CO₂/km.
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Section 8
08 Recommendations and next steps
Key points of your system and actions to take after commissioning.
South orientation
Your exposure maximises annual solar generation.
Tilt 30°
At a latitude of 44.8° N, this angle is effective.
Declare the installation to Enedis, the grid operator (CONSUEL electrical conformity certificate + S21 form)
Before commissioning
Recommended
Take out an EDF OA feed-in contract (the French buy-back scheme) if you export to the grid
Within 30 days
Savings
Schedule household appliances to run during 10:00–16:00
From activation
Insurance
Check the cover provided by your home insurance (panels)
Before installation
Maintenance
Schedule an annual cleaning of the panels (generation +3–5%)
Annual
Monitoring
Set up generation monitoring (connected inverter or meter)
From commissioning
🔍 Performance monitoring
Check your inverter's generation every month. A drop of more than 15% compared with the previous year may indicate a problem (new shading, panel fault, inverter problem). An inspection by a technician every 3–5 years is recommended.
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Section 9
09 Administrative formalities
Mandatory steps before and after installation. Allow an overall lead time of 2 to 6 months.
1. Prior works declaration (déclaration préalable) at the town hall (mairie)
Form Cerfa 13703. Processing time: 1 month. Mandatory for any installation visible from the public road.
Check with your town hall (mairie) about local rules: the PLU (local urban plan), protected areas and the AVAP (heritage protection zone).
2. Connecting to the grid with Enedis, the grid operator (CONSUEL + CACSI)
Allow for this lead time between signing the quote and actual commissioning. Enedis lead times vary by region.
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Ref. a1b2c3d4 · 16/10/2026
Section 9
09 Glossary
The technical terms and acronyms used in this report, defined simply.
Self-consumption
Direct use of the electricity generated by the solar panels to meet your own needs, without going through the grid.
Self-consumption rate
Share of the solar generation used on site. E.g. 70% = 70% of the generation used directly.
Self-sufficiency rate
Share of the electricity consumption covered by solar. E.g. 40% = solar covers 40% of annual needs.
CRE
Commission de Régulation de l'Énergie, the French energy regulator. Independent authority that sets the buy-back and feed-in tariffs and the bonuses for solar PV.
EDF OA
Obligation d'Achat (purchase obligation): the legal scheme behind the EDF OA feed-in tariff, requiring EDF to buy back the electricity exported to the grid, under a 20-year contract, at a rate set by ministerial order (arrêté) and indexed every year.
kWh
Kilowatt-hour. Unit of energy. 1 kWh = 1,000 W for 1 h. A French household uses 4,500 kWh/year on average.
kWp
Kilowatt-peak. Rated power of an installation under standard conditions (1,000 W/m², 25°C). 3 kWp ≈ 7–8 panels.
LCOE
Levelized Cost of Energy. Average discounted cost of the energy generated over the system's lifetime, in €/kWh.
Self-consumption bonus
Support paid by EDF OA until 1 June 2026, abolished since then for any new installation (no amount is deducted).
PVGIS
Solar weather database of the European Commission (JRC), used to estimate generation from the 2005–2019 typical year.
Payback
Return on investment. Number of years for the cumulative savings to pay back the investment.
Surplus
Electricity generated but not used, exported to the grid and sold to EDF OA under self-consumption with surplus sale.
IRR
Internal rate of return. Equivalent annual interest rate that an investment with the same cash flows would earn. IRR > 8% = excellent.
TURPE
TURPE grid access charge: annual contribution paid by self-producers for using the grid. LV ≤36 kVA: 26.40 € excl. VAT/year (CRE/Enedis).
NPV
Net present value. Net wealth generated in today's euros, after discounting at 5% a year. Positive NPV = profitable.
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Section 9
09 Glossary
Financing: the terms, and the points to check before signing.
APR (TAEG)
Annual percentage rate of a loan: rate, arrangement fees and insurance included. It is the only figure that can be compared between two offers.
Tied loan (crédit affecté)
Loan tied to the quote: the funds are released for this project. A personal loan is more flexible but often 0.5 to 1.5 points more expensive.
Payback (break-even)
First year in which the cumulative balance turns positive and stays so, once all the financing has been paid.
Net gain
Cumulative savings over the study period minus everything you have paid: purchase, down payment, instalments, insurance, rent, buy-out.
Before signing a loan
APR (TAEG)
The real cost, insurance and fees included.
Type of loan
Loan tied to the quote, or a personal loan, often 0.5 to 1.5 points more expensive.
Exit
Early repayment penalty and notice period.
Before signing a rental
Ownership
Who owns the equipment at the end, and at what price.
Rent
Fixed, or a written indexation formula. The rents in the report are public figures or examples, never offers: replace them with those from your quote.
Exit
Termination, removal, transfer when the home is sold.
Surplus
Who signs the contract for selling the surplus and who receives the income.
Legal rate ceiling (usury rate) in Q4 2026: 8.56% for a home-improvement loan of more than 6,000 €. 14-day withdrawal period for a contract signed at home or at a distance.
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Section 10
10 Sources & legal notice
Traceability of the data used in this simulation.
Data sources
Weather data
PVGIS 5.3, JRC (Joint Research Centre), European Commission. TMY (typical meteorological year) 2005–2019. re.jrc.ec.europa.eu/pvg_tools/
Electricity purchase price
CRE (French energy regulator), 1 August 2026. EDF regulated Base tariff: 0.2001 €/kWh incl. VAT.
Surplus export rate
CRE, Q2 2026, EDF OA (feed-in tariff): 0.0110 €/kWh.
Full export rate
EDF OA: 20-year contract, rate set by ministerial order (arrêté, CRE) according to the power band and indexed at 2%/year since the arrêté of 1 June 2026; applicable band: 0.0110 €/kWh.
This report is provided for information only. The results are calculated from historical weather data (PVGIS TMY) and from the rates in force at the time of the simulation. Actual yields may vary depending on local conditions, the quality of the installation, changes in rates and the degradation of the equipment. This document is neither a quote nor a guarantee of generation. Grid connection costs (≈ 800–1,400 €) are not included in the investment shown.
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