Solar yield in Rome

📍 41.90°N, 12.50°E · Lazio, Italy

Rome sits at 41.90°N in Lazio, Italy. The annual average is 4.5 h peak sun-hours per day.

A Rome-based 400 Wp array generates an estimated 510 kWh per year — after a 78% system efficiency factor (MPPT, wiring, inverter losses).

Monthly solar generation in Rome

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	9	14	19	25	29	33	35	30	23	16	10	8	255
400 Wp	19	27	38	50	59	66	69	61	46	32	21	16	510
800 Wp	37	54	77	99	118	131	139	122	92	64	41	32	1019
1600 Wp	75	109	154	198	236	262	277	243	183	127	82	64	2038

Best month

Jul

7.4 h/day

Worst month

Dec

1.7 h/day

Annual average

4.5 h/day

Design your full off-grid system

Use the SOLARIS calculator to size a complete off-grid LiFePO4 system for Rome: 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 Rome's coordinates (41.90, 12.50). Real conditions vary by panel tilt, orientation, shading and weather — use the live calculator for site-specific results.

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