[Mudchief]

Dennis, I have 2 systems combined. The first one contains 4 140 watt panels at 12 volts. The second one contains 2 320 watt panels at 40 volts. With the Blue Sky controller they can be daisy chained together allowing you to use different voltage from different arrays. If you can go with bigger panels it will be cheaper. My 2 larger panels cost about $75.00 more than one of the 140 12 volt panels.