Solar Panel Sizing Calculator
Find out how many watts of solar panels you need to recharge your power station within a single day, based on your location and usage habits.
Power Station Capacity
10%50%100%
Location & Conditions
2 hrs6 hrs10 hrs
Panel Size
Your System
Energy to restore1024 Wh
Effective peak sun hours2.5 hrs
Charge window8 hrs
Min. panel watts needed482 W
Panels needed (200W each)3 × 200W
Total installed capacity600W
With 600W, you'd fully recharge in roughly 6.4 hours of good sun.
Recommended panels
482W
minimum total panel wattage
Using 200W panels: you need 3 panels (600W total)
Based on 2.5 peak sun hrs in UK / Northern Europe, fixed flat on ground / roof (typical), 85% system efficiency.
How it works
- • Peak sun hours is the number of hours a day when irradiance averages ≥ 1000 W/m².
- • Panels produce their rated wattage only in ideal conditions. Real-world output is lower.
- • MPPT charge controllers are the most efficient — budget PWM controllers lose ~20%.
- • Always oversize panels slightly; more watts = faster recharge & cloudy-day resilience.
- • Check that your power station's max solar input isn't exceeded by your panel array.
Know your solar needs? Now size your battery.
Use our Power Station Sizing Calculator to figure out exactly how many watt-hours of storage you need, then compare real prices.