The lead acid battery is for a high current application (650 amp @ 3 min max) and the lithium is a house battery. The lithium is a 12.8v nominal. It charges to 14.6v then the BMS cuts off incoming charge. The resting charge is 13.2-13.4v. The lead acid is a standard 12v nominal. The resting charge is 12.8v. This is a 2 battery isolator. Does it matter which terminal a battery is connected to? Does the isolator give charge preference to one post over the other?

  • Can’t say without details of the isolator... a piece of wire moved between two nails would work but that will be manual... – Solar Mike Jul 17 at 17:21
  • the battery isolator is a Promariner ProIsoCharge 120 1-3. The alternator is a Balmer 100A that is set to output 14.6v. The lead acid is AGM 4D, the lithium is 400 Ah with 200 amp BMS. – Marine Jim Jul 18 at 18:36
  • I had expected you to provide the link to the data sheet... But in the absence I will suugest you need to make sure the device is “make before break” otherwise you may end up with expensive damage. – Solar Mike Jul 18 at 23:49
  • the link to the manual and data sheet is promariner.com/en/library. you have to drill down the menu and open the pdf v Battery Isolator Manuals Battery Isolator Manual ProIsoCharge Manual – Marine Jim Jul 20 at 15:57
  • what exactly is 'make before break' mean – Marine Jim Jul 20 at 16:00

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