Solar yield in Helsinki

📍 60.17°N, 24.94°E · Uusimaa, Finland

Helsinki sits at 60.17°N in Uusimaa, Finland. The annual average is 2.5 h peak sun-hours per day.

A Helsinki-based 400 Wp array generates an estimated 284 kWh per year — after a 78% system efficiency factor (MPPT, wiring, inverter losses).

Monthly solar generation in Helsinki

Average daily kWh per month for common solar array sizes

Array size	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual kWh
200 Wp	1	4	10	16	22	24	23	19	12	6	2	0	142
400 Wp	2	8	20	33	45	49	46	37	24	11	4	1	284
800 Wp	4	17	39	66	90	97	92	75	49	22	7	2	568
1600 Wp	7	34	79	131	180	195	183	150	97	45	15	4	1135

Best month

Jun

5.2 h/day

Worst month

Dec

0.1 h/day

Annual average

2.5 h/day

Design your full off-grid system

Use the SOLARIS calculator to size a complete off-grid LiFePO4 system for Helsinki: battery bank, inverter, cable cross-section, fuses and a wiring diagram. Pin your exact location on the map for live NASA POWER data.

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How we calculated this

Daily generation = panel Wp × peak sun-hours × system efficiency (0.78). Sun-hour values are 20-year averages from NASA POWER, sourced for Helsinki's coordinates (60.17, 24.94). Real conditions vary by panel tilt, orientation, shading and weather — use the live calculator for site-specific results.

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