This video will cover solar basics, briefly going over watts, amps, and volts as well as series and parallel connections.  How to Calculate Watts: Watts = Amps x Volts  *Please note that the comment made about "Panels rated 150W and below are rated as 12V panels" and "Panels rated 250W and above are rated as 24V panels" are technical specifications specific to Renogy panels. These specifications may or may not be the case with panels from other brands.