I've got four used (but supposedly decent) 200AH sealed lead acid batteries. The posts are through holes, almost 10mm, or maybe exactly 10mm. So I've lined them up in a row (length wise) so you could stick a rod straight through all of them. My plan is to bore the posts just slightly to stick my 3/8"s threaded zinc plated steel rod through. I know 3/8" is smaller than 10mm, but not by much. These threaded rods are just a hair over it seems. Figure I can get pretty good connectons with washers and nuts. But apparently, my conductivity is going to be much less than copper... 15% equivalent or less. So I'm about 00 equivalent gauge. 80mm^2, thereabouts. So I dunno, 15mm^2 copper equivalent. There's about 22" between the terminals. The load will mostly be connected on one end. So less than 6 feet, well under 2m for you metric folk. I want to hook up the inverter and be able to run pretty close to 110V/15A stuff for short durations. But normally, might run freezers for say an hour or two a day. Is this way too much resistance to keep batteries in parallel? These are 117lb batteries. I could also go with 1/4" rod, and then it would just fit. 5/16ths was out of stock. But then I'm what... 3 times higher in resistance? Curious to hear your thoughts.