Have you done the calculations for daily use? 1800AH of storage is huge, also 500 lbs. of added weight.
The Sanyo panels are nice but I doubt the price will bear out any increased efficacy over the life of comparable modules, sold at much lower prices. Of course, value may not be your criteria. There is worth in buying the higher priced item, sometimes.
Edit: Saw where you used the spreadsheet to calculate daily use. Something is probably amiss (like refrigerator duty cycle?), you are about double what most power gobblers report for daily use.
