I bought 32 and wished I got another 6 for the south west aspect of the house ... but still, producing 11mWh a year in the UK on an east/west aspect, electricity bill for the year (even with all cars in the household being EV's) is negative. Battery makes the difference - load shifting is doing the heavy lifting in the winter.

I hope you’re generating more than 11 milliwatt-hours per year, guessing you meant MWh :)

32*250*1400=11,200,000 watt hours, which makes more sense ;)