I'm not sure if it affects readings or not, but before I got cell holders I was using magnets.
Just soldered a small bit of nickel strip (recycled out of a pack) on end of wire, put that against the terminals and held it in place with a small rare earth magnet. The magnet never touched the cell. It worked really well, except on some Moli cells which seemed to have a non-attractive positive terminal.
On 14s and 4kw. Is it 4kw max? If not you need to calculate base don max current.
4000/51,8 = 77A
Thats just above 1A per cell. On my pack that is designed per basis MAX 1A per cell and 80A per pack i have 6*2.5mm2 copper wires twisted together. They should easily take the load without any larger loss. Reason for 2.5mm2 is because thats easy to find here for scrap value.
My wire guy says this solid copper is good for 95amps. Plus with two runs of it, it should only need to carry half the load.. just need to make sure my bus connection at the end can carry the full load..
what happens during discharge if one of the packs is a smaller capacity. For example (not that i plan on doing this) if you had 13s80p and the 14th in the series was only 40p? does that pack pull less amperage than the others so they all fall evenly?