AlaskanNoob

"The 2 banks of 4 wiring digram you have is incorrect. on the 1st of 4 batteries positive connected to Busbar and on 4th battery negative to Busbar, not both positive and negative to busbars on battery 1 and 4." I don't see why that is incorrect. The positives are all wired to the positive bus bar, and the negatives all to the negative bus bar. But if you can explain why that is incorrect, I will pass that on to the Pylontech dealer who came up with it for him to look at. Can you explain this more? "4 x batteries at 100amp each 400amps per set of 4 or Peak 15s 800amp discharge will melt your cables instantly :0 " Good point, and one that applies to both of these options I asked about. Yes, 400A per set of 4 batteries going through two sets of wires which means 200A could go through the wires and that would be an issue. The MPPT and the Inverter would need to be adjusted to limit power due to cable rating. I agree what would make the most sense would be each battery wired to the bus separately, which is a very very very poor design by Pylontech for this battery system. But it would be handled by limiting the power going to the bank, or being discharged from it. The Peak discharge of 800A (or 200A per battery) if it happens is a design flaw by Pylontech since even with one battery you would have that issue. Unless, even more strictly speaking, you used two sets of cables (4 total) for every single battery. Which shows how ridiculous Pylontech's cables are. Great point on the BMS. I think the Wiring Unlimited guide was meant for lead acid and you're right the BMS should make that not an issue. So I'm thinking the 4 banks of 2 is perhaps better because it won't depend on the BMS but I agree it shouldn't matter. Thanks for the info, and I hope you'll explain further why you think the 2 x 4 version is wired incorrectly.

I've got 8 x US5000, 4 long positive cables, and 4 long negative cables (same lengths in either scenario). The question is where to put those cables in the battery bank. The network cables will talk to the system and treat it as one big battery bank of 8 regardless, from what I understand, but I have some questions on differences in electricity flow between the two options. The 2 banks of 4 is an option I've seen some do, also referred to as "double stacking." The questions I have on this option, what about the two batteries in the middle of each stack, will they get unbalanced since the current goes to the top and bottom batteries first? Also, does this drive a bigger circuit breaker/fuse for the cables because there are 4 batteries that can deliver short circuit current rather than the other option which would be limited to only 2 batteries providing current per set of cables? The manual says each battery has a short current/duration time of <2000A/1ms. The Victron Wiring Unlimited Guide would seem to favor 4 banks of 2 for the balancing issues...