Five‑Year Performance Review of a 9.6 kW Photovoltaic System in Poland

Introduction

The creator revisits a residential solar installation that has been operating for the past five years. After attending a renewable‑energy fair in Warsaw, he decided to share real‑world data to answer common questions about system efficiency, seasonal output, and the practicality of going fully off‑grid.

System Overview

• Installed capacity: 9.6 kW peak (pika)
• Tilt angle: 35°
• Azimuth: 200° (south‑west orientation, 20° off true south)
• Commissioning date: June 2020
• Inverters and panels: detailed specifications are provided in a linked video (not repeated here).

Data Collection

The author extracted monthly production figures from the inverter’s monitoring portal for the years 2021‑2024 (2020 data omitted to avoid skewing). The data were plotted to show yearly totals and month‑by‑month variations.

Yearly Production and Efficiency

Seasonal Variation

• Summer months (June‑August): 600‑800 kWh per month.
• Winter months (Nov‑Feb): production drops dramatically, e.g., 207 kWh in November 2023 vs. 88 kWh in December 2023.
• Household demand: roughly 800 kWh per month in summer, rising to about 1 MWh per month in winter due to shorter daylight hours and heating needs. The mismatch between winter generation and consumption highlights the challenge of achieving full self‑sufficiency.

Off‑Grid Feasibility

• Even with a large battery bank, the winter deficit (≈1 MWh demand vs. ~200 kWh generation) makes 100 % off‑grid operation unrealistic for this setup.
• The author notes that only households with much lower demand or oversized PV arrays could consider full off‑grid independence.

Energy Storage Experiments

• Plans to test a 10 kW battery system next year to improve night‑time self‑consumption.
• Observes that battery prices are falling: a 30 kWh unit is offered for 9 900 PLN (~$2 200), making short‑term storage economically attractive for peak‑shaving or arbitrage (charging when electricity is cheap, discharging when it is expensive).

Economic and Practical Insights

• The system’s annual output (~10 MWh) represents a solid return in a country with moderate solar irradiance like Poland.
• Real‑world data contradicts some negative myths (high fire risk, rapid degradation, poor profitability) – the author has not observed any major issues.
• Sharing personal data encourages community verification and helps prospective prosumers make informed decisions.

Community Call‑to‑Action

The video invites owners of PV systems to comment with their own performance metrics (capacity, tilt, azimuth, yearly production) to build a broader dataset for Polish installations.

Final Remarks

The creator will continue publishing yearly updates and encourages viewers to subscribe, rate the video, and visit the testhub.pl website for additional resources.

A well‑oriented 9.6 kW rooftop system in Poland consistently yields around 10 MWh per year, proving that solar can be a reliable energy source even in less sunny climates, though full off‑grid operation remains impractical without substantial storage or oversized arrays.