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Specifically the blue input port. I will be connecting these batteries to to a charger/inverter with the hope of adding solar soon. Of course there is no documentation so my question is the blue port a charging port or an information port? Should I use it with the charger or just connect it via...

correctly. I have a 3000W inverter and 3 x 100AH of lithium batteries. The manufacturer of the inverter says the minimum for 3000W is 3 batteries, yet I'm not sure if I am getting 100% out of either. When I run my shop VAC or Portable AC (not together) the inverter cycles off and then back on...