I ordered an Apex HO alternator, 390 amp for the car, and was planning to add a second battery for reserves. Correct me if I'm wrong, but I understand that one battery will consume the other without an isolator? The 390a should leave me with a constant surplus of available power; am I correct in assuming that the HO alternator size should alleviate that concern? If there is a surplus, does this also remove the need for an isolator? Lastly, any input on battery size?
The equipment is as follows:
Car: 2003 BMW 325xiT (stock alternator was 120a)
Zapco: Z1.600 LX
Tru Technology B-2110
Airlift Performance Air ride system: (Draw from the compressor It's fused at 30a)
Thanks for any insight you can provide.