I was not just trying to make a cheap solar setup, I was making an inexpensive, durable, practical, versatile, quality solar setup that would last. I'm sure you can find cheaper parts than what I have listed here, but this was as basic as I felt I could go and reliably get a quality end result. You can always order larger solar panels or more batteries but most people only use shed lights occasionally and this setup is very good for around $75. The easiest way to save money is ordering parts online that are shipped directly from China found on various websites, of course the downside of this is that it can takes 4 to 6 weeks for delivery so plan accordingly.

1 ea Solar Panel with Inverter kit. I purchased an Instapark 5W mono-crystalline setup from Amazon for $32. You can find cheaper panels but I wanted to make sure I had one in a sturdy aluminum frame, heavy backing and tempered glass. This is not the best or worst panel out there, just good enough to do the job.

1 ea 12v deep cycle battery, SLA (Sealed Lead Acid), these vary greatly in price depending on your needs but a good basic one can be found for less than $15

1 ea 12v Terminal Block, these can be found on Amazon for less than $4

2 ea 12v switches. These can be found on ebay for as little as $1 ea but may take weeks to ship

1 ea 12v Exterior Grade LED Light. These are in a wide range of styles and prices depending on your taste and budget. I would recommend something less than a 5W. I used a waterproof boat light found on ebay for $8.

1ea 12v Interior Grade LED Light. Again this is available in a wide range of options. I will demonstrate a simple 3W LED fixture that I put together for less than $4 ordering parts from ebay

2 ea Car Fuses and Fuse Holders sized for your system. Also available from ebay for a few dollars.

A few feet of size appropriate Heat Shrink Tape which can also be ordered from ebay for around $1

A tiny amount of Caulk for sealing around exposed areas (this is probably sitting in your garage somewhere)

A Solar Panel Mounting Kit, for mounting the panel on your roof. I'm putting this down reluctantly because it cost $6.99 and it just seems like there must be a more frugal way to do this. You may have a few scrap bolts or some metal pieces lying around you could recycle for this and shave $6.99 off your cost.

You may need some additional 12v Wiring, the kit I ordered came with enough that with a little planning I was able to splice it up for all my wiring needs.