If you will be ground mounting your solar panels, consider the wildlife in your area. Panels can be quickly destroyed by curious raccoons, hungry deer or hibernating squirrels. Try to place your panels in an area that is not easily accessible to such animals to optimize the lifespan of those panels.
10.2 KW Grid Tied. Fronius Inverter.
Cleaning your solar panels does not need to be labor intensive. You want to avoid abrasive soaps at all costs, as they can deteriorate and even destroy your panels. So long as there is not caked up dust or bird droppings, frequent rinses with just hose water should be more than enough.
How dense your solar panels are will determine their efficiency. Getting high density solar panels may cost you quite a bit, but after a while they'll pay for themselves because they produce more power. Before you select your solar panels, you should consider panel density.