I have 4 batteries wired in series parallel for more capacity on my 24vdc Terova.Read the thread and let me know if you have questions. Mac https://www.myfishfinder.com/fishing_forum/index.php?topic=74118.0
read thru a few post didn't see anything pertaining to my post My post is about peoples opinion on what kind of wire to use to extend the wire from battery to TM, not how to hook the batteries together parrellel I already did that. MK says use 8g for the length of the extension(up to 15'). I was thinking about using 16' 4g CCA jumper cables. 8g Marine Grade tinned copper wire is a little salty for me.
I'm a retired electrician. 4 ga jumper cables will be fine. Just pick up a decent set. I wouldn't use copper coated aluminum. Too much expansion and contraction under load.Don't buy the cheap Wally World cables. The lugs you use to connect to the batteries are as important as the wire you use. Use a copper lug like this with dielectric grease.Rg