This is the FOURTH school I've worked at that has the same problem. The others I've worked at have deliberately refused solar installs after doing the sums.
In certain places, solar is just POINTLESS.
I'm in the UK, a major developed country the same latitude as other huge centres of population the world over. (Please don't say "Ah, yes, in the UK you won't get...." - this is exactly my point, solar is not a panacea).
And it's currently reading... ZIP. Literally I have to interpret the decimal points, so it's less than 100W. It's 1pm, it's got cloud cover but not raining, etc. and is daylight enough that you don't need a bulb in the office. We're in the middle of 28 acres of farmland (which tells you just what kind of school we're talking about here).
It's a school so it's electrically checked annually. They are paying for support, so it's verified to be working . It's cleaned every term. It's on a feed-in tariff and they are pushing their green credentials to parents, so they have an interest in seeing it work. I've seen it read nearly a KW, in the Summer, in direct sunlight, on scorching hot days, if you're lucky.
It's on an unobstructed roof, faces South, no trees or other cover.
It's 10KWp. It's about five years old (please don't say "Oh, you need to replace it to get the new.... what's the point if every five years you have to replace a system that takes 20+ to pay itself off?).
In over five years, it's generated 24408 KWh. That's everything, total, complete.
We are not alone. Selling solar to schools is a known con for bursars in the UK. The suppliers do exactly what they promise (and they never promise a minimum), the kit does what it can (and the kit is all third-party so you can verify others do get the maximums). It gets installed properly and schools that have it ALL complain how little it actually does, no matter what company, panel, etc. they use.
Honestly, fourth school I've had this at, all of them the ONLY schools to actually have solar.