CalcHab

Solar Power Calculator

The solar power calculator helps homeowners and businesses estimate the ideal solar photovoltaic (PV) system size based on monthly power bills, regional solar irradiance, and desired energy independence.

кВт·год
грн
Solar PV Capacity
3.8 kWp

7 pcs сонячних батарей по 540 Вт (Tier-1)

Estimated annual savings:≈ 18,144 грн / рік
Inverter rating
5 kW

інвертор під генерацію

Required roof area
≈ 18 m²

під кутом 30-35°

Recommended LiFePO4 batteryзабезпечує живлення оселі на добу блекауту
10 кВт·год
Annual PV generation:≈ 4,347 kWh

Solar engineering tips

Optimal rooftop azimuth is true south with a 30-35° tilt. East-west splits yield ~10% lower peak output but smoother generation.
LiFePO4 battery chemistry is the safest and most durable choice for home energy storage (6000+ deep cycles).
A 1 kWp array occupies roughly 5.0 m² of roof plane including structural clearance gaps.

How to use

  1. Enter average monthly electricity consumption in kWh or monthly electric bill.
  2. Select your geographical region to account for solar peak sun hours.
  3. Choose system architecture: grid-tied, hybrid with battery backup, or off-grid.
  4. Specify individual panel wattage rating (e.g. 450W to 550W).
  5. View required system capacity in kW, panel count, roof area, and annual kWh yield.

Solar Photovoltaic Sizing Methodology

System capacity is determined by matching average household consumption against local solar irradiation, factoring in DC-to-AC inverter conversion losses (typically 14–18%).

Frequently Asked Questions

How many solar panels do I need for my house?

A standard 5kW residential system typically uses 10 to 12 high-efficiency 450W–500W modules requiring roughly 25 square meters (270 sq ft) of roof space.

Do solar panels work in winter?

Yes, solar panels generate electricity from light rather than heat, though shorter daylight hours and cloud cover reduce winter yield to roughly 15–25% of summer peaks.

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