For a longer time, I got a used solar panel as gift. The problem, the glas was brocken because of a storm, but the electric side is totaly ok.
Also what to do. One Panel is not enough to power a full house or to sell the current in the public network, but to charge the Battery of the boat and may be to power of the waterpump in the garden.
Now I found time to build and test this project and may be someone can learn from my fales as well.