go to your game settings and change the game time to 120x for time. so, purchase and place (anywhere) your solar panel. At this point you will have enough money to buy one solar panel. dont just sell through your menu but actually take them in and place them in the designated marked area to receive more money back from your sale. I forget where i read this but i had read about this money exploit where you start off by taking all of your farming equipment and tractors to the main store where you can drop off and sell your items. Easy money exploit for Farm Sim 15: a couple years ago I played the earlier Farm Simulator 13 on Xbox 360.