I'm also interested for solar panel. Total newbie just wondering :

1. For solar panel orientation, which phase/time is the best to catch ? The back of my house gets the morning sun, and front gets evening sun.

2. I'm assuming the panels are connected to a battery ? What battery is recommended ? Tesla Powerwall ?

3. Is there a need to wash the panels ? If so how is it done as my roof has no access for regular maintenance. Also worried about damaging the roofing sheets