I've heard that a person needs a 20 volt difference (minimum) between the output of the panels and the system. For example, I have 8, 39 volt (305 watt) panels and I wish to create a 24 volt system (24 volt inverter). Will 39 volt panels be enough voltage to power a 24 volt inverter system? If the voltages are too close, would there be any advantage to connect the panels in series/pairs (78 volts)? I was thinking if that was too much of a spread, then I could probably install a 48 volt system with 78 volts of solar. Any ideas on this? Thank you in advance! Glennman