If you will be installing the same panels/hardware, for the costs of 300W project you can consider that:
- x3 bendable 100W panels - about $600 shipped (fleabay is less expensive than Amazon)
- MPPT charging controller - a good one like MorningStar TS-MPPT-30 is about $300 shipped plus $80 for a monitor
- aluminum alloy hardware to fab support rails and mounts - around $100 or so from your local hardware store
- good quality adhesive - around $60 if you are as liberal with applying it as I was (I had to buy x4 10 oz. cartridges - that's 40 oz.!). If you will be using 3M 4000, don't buy a large sausage pack, a 10 oz. cartridge is much more easy to work with.
- good fine-stranded silicone-insulated wires - 10AWG or 8AWG (fleabay is your friend) - about $20
Comes to around $1,160.
However, for additional $200 you can have 400W installed. I've just decided to go with 300W, but 400W is a possibility.
-albertr