Massive systems atop houses and businesses are a long-term project that start to repay their cost after several years. A tiny system would be like flaming a Zippo lighter in hopes of reducing an LPG heating bill.
We have a tiered pricing system down here that starts off at the eqvt of 6 US cents a kWh. But surpass 500 kWh in a 2-month period and the kWh price soars to near fifty cents a kWh. Cutting total kWh usage would be feasible even though panels are anything but cheap.
Periodic outages (like 6 days total in a 30-day span) make solar voltaic or generator power mandatory. Heavy shade stops my solar plans, cold.
Run the kWh numbers according to your cost. If a thousand watts of panels cost "X" amount of dollars, yet a kilowatt of power only costs 12 cents, Imagine the thousand watts, plus inverter as costing a thousand dollars. One thousand dollars divided by 12 cents is 8,333 and you only get the 12 cents when the sun is at it's peak. Long-Term may be an understatement. And a thousand watt system is by no stretch of the imagination "small". It could power a tiny air conditioner for the peak sun period. This is not a rational plan.