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I have 4 battery packs at 127 volts and each is ~50 amp-hours.
I am trying to achieve ~200 amp-hours at 127 volts and I have them wired as shown.
Please let me know if I need to clarify what I am asking.
My questions are,
1) Will the shunt work where it is, or do I need to move all the negative connections to go through the shunt and then to the controller?

2)Should the positive connections be to the battery and then to the contactor, or is the positive connection as it is ok.

View attachment 125830
Your shunt will measure only the current from batteries 3 and 4, this is likely to be 50% of the total current to your controller, you should connect battery 1 or 2 - terminal to battery 3 or 4 - terminal.
Your emergency disconnect will only disconnect batteries 3 and 4, this is not acceptable, connect battery 2 + terminal to battery 3 + terminal.
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