In north-west eu maybe, in south-west not so much; I have had solar for 20 years in different houses in the south and it covers more than enough all year round (we are off grid). During the days, summer and winter, you can switch on whatever as it will never run out; during the night it obviously depends on the amount and quality of batteries. I have had 1 moment without power and that was a rare event for that location: snow covering the solar panels.
You're still seeing a large swing in insolation between summer and winter in SW Europe. You can tilt the PV arrays to increase winter production at the expense of summer (and at expense of overall production); did you do that?
