EG4 PowerPro battery wiring: gross imbalance in charge/discharge with recommended wiring

Anyone familiar with battery wiring knows length of current path should be identical for all batteries (and of course same wire size). The classic unbalanced system that companies like Victron warn against in their wiring discussion of battery systems.  It's self evident that more wire for some batteries vs others is unbalanced. 

The EG4 user manual recommends wiring setup that is clearly sub-optimal, particularly for 2 batteries.  Discussion here assumes use of two 2/0 AWG cables wired into the EG 18kPV or similar.

2 batteries

Recommended wiring for 2 batteries is simply wrong/bad.  There should be one red and one black going to each battery for a perfectly balanced system. Instead, EG4 has two reds and two blacks to the first battery, then a coupling kit to the 2nd. Anyone familiar with electrical balancing knows this is sub-optimal.  I think EG4 recommends this because the supplied cables are too short to reach the 2nd battery — lame.  Amperage figures show the imbalance both for charging and discharging can be wildly different eg 120A vs 60A or some such (varies but always imbalanced).

3 batteries

Recommended wiring for 3 batteries assumes the supplied cables eg two reds and two blacks to battery #1.

A cross cabling kit connects battery #1 to #2, ditto for #3.  This creates a strongly unbalanced system with battery #1 seeing far higher amperage in/out. This can be directly observed on the display of each battery.

Once charge exceeds 90% or so, the situation reverses: batteries #2 and #3 now see increased amperage vs #1, with #1 tailing off (since it has a higher charge).

Direct observation shows wildly different amperage in/out no matter what.

For example (3 batteries wired exactly as recommended), you might see solar charging that looks like 80A to #1, 40A to #2, 23A to #3 (made-up numbers but this correctly  represents the behavior).  Similar behavior when discharging.  Always the current flow is wildly unbalanced with battery #1 taking the brunt of the load.

That this is normal and expected is obvious: if you add another 106 inches of cable from #1 to #2 (53 inches for red, 53 inches for black for round trip of 106 inches), and the same 106 inches from #1 to #3, then naturally the current flow will react to this substantial impedance.

I don't know why #3 gets less flow than #2 since it is wired the same as #2... perhaps because it is on the 4th post of the built-in busbar. Or perhaps that set of cables has higher impedance.

Does any of this matter given the incredibly long rated lifecycle of the EG4 PowerPro 14.3 kW batteries?  Dunno.