To ROYP.
I pick up replacement 100AH batteries from the local battery supplier for a fraction of the original cost. They replace them from computer back ups after nine months so they are almost new. The Amish are starting to pick them up to run with solar panels so the have electric without being hooked up to the outside world. This makes it a little harder to get the batteries.
300AH is nice but I physical pick them up and us them in my boat for the electric trolling motor. !00 AH weighs about 60 pounds.
How heavy is a 300ah?