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Okay, so it's been a week since I first posted... Thank you everyone for adding your wisdom and experience to help me out. What a truly great and supportive forum! Here's what I did. I rewired things as was first suggested such that they are truly in parallel.. like the 2nd of my drawings in...

Interesting that you bring this up again! I just recently have found the old problem arising at higher loads... When I run a load of 150 amps, one battery gives only 40, ant the other gives 110, tripping its BMS. So now, I'm planning on rebuilding it in a 2p4s configuration with a 200 amp...

Okay, those sound perfect! I'm on the search now! Thanks for the input! Are yours rated for 200 amps do you know?

I think you were spot on with the bad connection idea! my shunts (i have one for each battery or bank) were telling me that the current was truly different during low loads, but near the same for higher loads. Thank you for the thoughts on this!

Thank you so much for all the thoughts on this! You've been of tremendous help!

So I'm reconfiguring my battery to build it up as a 2p4s 560ah total... I will have loads of up to nearly 200 amps (I'm using the Radio B tech 4s 200 amp BMS), but I'm just now realizing/suspecting that the standard bus bars that come with the battery cells (ninthcit 280 ah, in my case) are not...

Flexible? As in jumpers built of cable and Lugs? Seems like the 'spring action' of the cables would put constant stress on the studs... I'm maybe not visualizing it correctly, but short jumpers of thick cable seem like a stiff spring, unless I could find ultra pliable cable... Is that the...

Okay, I have a number of questions concerning the safety of charging my DIY 18650 battery packs. 1. for a 2s battery pack, 8.4 volts, 3000 mah (total of 2 cells), is it okay to charge it with a 'compact power adapter' that I found while cleaning out the basement. I think it went to a...

So, I'm not sure what's going on here... I built up 2 separate batteries, each one with brand new 3.2v 280 amp hour lifepo4 prismatic cells, 4s configuration, using an overkill BMS on each. Then the two batteries are in parallel to the positive and negative bus. Everything seems great except...

I've been using the 1314a to isolate the starter battery (lead acid) from my house batteries (lifepo4), but that part of the system was installed prior to my switching to lifepo.. so I'm now worried that maybe I'm not sufficiently protecting the lifepo or the lead acid. I can see that the...

It sounds like you and I have nearly identical setups. The comment that MCharles made about connecting the positive of one bank, but the negative of the other bank is going to be, i think, the key. The first pic below is my current setup. It seems parallel to me, but check out the second...

My alternator charges my 12v 4s 280 amp hour pack up to 14.2v. While that seems reasonable, I'd prefer to top it out at 13.9, so I set those parameters on my overkill BMS. Now the BMS kills the incoming current when the pack hits 13.9. Seems to be working great! But... I just read in...

Thank you! This makes sense to me! 8 cells total, arranged in 2 packs, each in 4s with its own BMS. So my battery bank consists of two 12V batteries... but I agree, not a big deal, just like all nomenclature it just helps in our quest to communicate clearly

Okay! First of all, thanks for the help on the nomenclature ('bank' instead of 'battery')! Second, i think I messed up on how to put them in 'parallel'... I simply connected both, separately, to a common fuse which then goes to positive bus, instead of connecting A to B and then B to the...

What a great looking build! Where'd you source the bars?

HA! Silly me, thinking that there was any such thing as a simple question... ? So now I'm looking at flexible and braided bus bars (installation is in a 4x4 that sees a lot of serious vibration... jarring would be more accurate). Seems more difficult to calculate amperage rating, given the...