I'm not particularly surprised. In the early days, solar panels could be looked on as an investment. The FIT payments meant that they earned you a tax-free income whether you used the electricity or not.
But as the FIT payments dropped, installers tried to justify the cost of the install by exaggerating the potential savings on electricity bills. The trouble is, a reasonably large install will generate far more electricity than most people will need on a sunny day, and nothing at all throughout the evening. So most people use well below 50% of what they generate.
The generation and usage can be evened out by adding a battery to the install, but that adds a lot to the cost. There's no guarantee that cost will ever be recovered in electricity savings.
