I called solar blvd.
Shipping for 3 of the 24 v panels would be $250.00 They also said that if part of the panel was shaded I would lose part of the capacity, not all. He was not able to explain much about the diodes.
Senario 1:
Go to the Amerisolar 250 watt 24 volt from solarblvd for $170 ea ($510) plus $250 shipping = $760 or $1.01 per watt.
MS Tristar 60 mppt $475.00 at Solarhome
Aluminum home brew brackets non tilt, cable, disconnect, fuses, switch, $200.00
$1,435 for 750 watt $1.91 finished cost. (my labor)
Scenario 2: 520 watts
4 solarcynergy 130 for $492 plus $135 shipping = $627
MS Tristar pwm 45 $150
mounts, tilting, combiner box, switches, fuses, $300 maybe less or more?
$1,077 or $2.07 per watt
Scenario 3: 400 watts
Ebay 4 100 watt panels with shipping $500
Cheap controller $30.00 or MS Tristar 45 pwm $150
Misc stuff $300
$830 w/cheap controller or $2.07 per watt. With MS pwm 45 tristar $950 or $2.37 per watt
Scenario 2 and 3 will end up with me on the roof tilting because like many guys I want the pedal to the metal in some ways.
If I fall off the roof, wife finds younger guy who uses the money to have a 750 watt system installed and they ride off.
So if we average the difference out between scenarios it's about $500.00 If we apply "Marriage math", the difference becomes $250 for me and $250 for her and "I" dont have to climb and tilt.
A guy I worked with always called me the "Cheap B - - - - - d" but I need to think seriously about scenario number 1.