Calculator

Calculate Your Solar Panel System

3 steps — and you get a personalised calculation with monthly generation chart, CO₂ savings and 25-year profit projection.

Solar Panel Calculator 2025

Latvia climate data · Real system prices · Detailed calculation

Consumption

Property

Details

Electricity consumption

Enter your average monthly consumption and electricity tariff. You can find these on your electricity bill.

Monthly consumption ?Find the average kWh on your bill or in the grid portal. A typical Latvian home uses 200–600 kWh/month.

kWh/mo

Electricity tariff ?Average tariff in Latvia 2025: €0.22–0.28/kWh (including distribution charge). Check your bill.

EUR/kWh

Consumption (quick select)

300 kWh

50 kWh
Small flat 300 kWh
Private home 2000 kWh
Business

Property type and location

Select the property type and roof type. These affect system capacity and installation costs.

Property type

Private home

Business

Agricultural

Ground-mounted

Roof type ?South-facing pitched roof gives maximum output. Flat roof — we use a tilt structure. East/west orientation reduces output by ~15%.

South-facing pitch

East / West

▭Flat roof

Roof area ?Usable roof area on the south-facing side. 1 kWp system needs approximately 5–6 m². 5 kWp = ~28 m².

m²

Region ?Solar radiation data by Latvian region: Kurzeme ~1,100 kWh/kWp, Riga ~1,060, Latgale ~1,020 per year.

System configuration

Final steps — indicate whether you want a battery and what percentage of electricity you want to self-generate.

Do you want a battery? ?A battery lets you store daytime energy for evening use. Increases self-consumption to ~80%. Additional cost: €3,000–5,000.

Without battery

Possibly later

Yes, with battery

Daytime self-consumption ?What % of generated energy you consume in the home during the day. Grid system without battery: ~35–50%. With battery: ~65–85%.

45%

20%
Low self-use 45–55%
Typical 90%
With battery

Net metering applies ?Latvia's net metering system allows surplus generation to offset consumption 1:1. Matching generation to consumption maximises savings.

Annual electricity price growth ?Historically electricity prices in Latvia have grown by 3–5% per year. Conservative estimate: 3%. Optimistic: 5%.

Calculating your system...

Your calculation result

— EUR

Estimated annual electricity savings

—

Recommended capacity (kWp)

—

Payback (years)

—

25-year profit (EUR)

Annual generation

—

kWh from solar energy

System cost

—

EUR (full installation)

Annual CO₂ saving

—

kg CO₂ equivalent

Roof area required

—

m² (panel footprint)

Monthly generation forecast kWh / month

25-year investment projection

—

202520302035204020452050

Energy independence

—%

Covered by solar annually

CO₂ saving over 25 years

— t

CO₂ equivalent — like — trees' 25-yr absorption

Indicative calculation. The calculator uses average Latvian climate data (PVGIS database), typical system prices (€950–1,150/kWp) and a standard system loss factor (~14%). Actual system generation may vary depending on roof orientation, shading, pitch and panel quality. We will prepare a precise quote after a free site survey.

Get a precise quote

What Data Does the Calculation Use?

Our calculator is based on real Latvian data and industry standards:

PVGIS solar data

The European Commission's PVGIS database — real Latvian solar radiation data by month and region. Kurzeme 1,100 kWh/kWp, Riga 1,060, Latgale 1,020 per year.

System losses 14%

Inverter efficiency (~97%), cable losses (~2%), temperature coefficient (~3%), dust accumulation (~2%) and other losses — totalling ~14% from theoretical value.

Prices €950–1,150/kWp

Typical 2025 installation costs in Latvia, including panels (monocrystalline 400–450W), inverter, brackets, cables and labour.

CO₂ factor 0.326 kg/kWh

Latvia's electricity CO₂ emission factor based on Latvenergo and LLTA data. Corresponds to Latvia's 2024 energy mix.

Monthly Solar Radiation Distribution in Latvia

In Latvia solar energy is strongly seasonal — up to 8× more in summer than winter. This is why accurate monthly data must be used in payback calculations:

Month	kWh/kWp	Share	Monthly 5 kWp system
January	15	1.5%	~75 kWh
February	35	3.4%	~175 kWh
March	80	7.8%	~400 kWh
April	115	11.2%	~575 kWh
May	145	14.1%	~725 kWh
June	155	15.1%	~775 kWh
July	155	15.1%	~775 kWh
August	125	12.2%	~625 kWh
September	90	8.8%	~450 kWh
October	55	5.4%	~275 kWh
November	20	2.0%	~100 kWh
December	10	1.0%	~50 kWh

Total ~1,000 kWh/kWp per year. Optimal roof orientation (south, 35° pitch) adds ~5–10% extra generation.

Average Results for Different Property Types in Latvia

Property type	Monthly consumption	Recommended capacity	Annual saving	Payback
Small home	150–250 kWh	2–3 kWp	~€420–690	5–7 years
Medium home	300–500 kWh	4–6 kWp	~€760–1,380	5–7 years
Large home	600–1,000 kWh	7–12 kWp	~€1,500–2,760	5–8 years
Small business	1,000–3,000 kWh	12–30 kWp	~€2,600–6,900	4–7 years
Agricultural	3,000–10,000 kWh	30–100 kWp	~€6,900–23,000	4–6 years

Free precise quote after site survey

The calculator gives you an initial estimate. For a precise price and payback calculation, fill in the form below.

Solar Panel Calculator — Calculate Your Savings