Bingo Vic! Will do once I get my 712 on-line.
Just got off the phone with Blue Sea Tech [20+mins] and he boiled it down for me...the ACR is simply a voltmeter linked to a relay..my 2 AGMs in parallel ['bank' in Hawk] and Tundra AGM are two separate "battery banks" in parallel that when the relay is closed the ACR voltmeter reads it as one single battery and when open it treats them as two batteries. When 7611 relay is open and voltage of 13.6v for 30 sec [or 13.0v for 2 mins] is metered it closes the relay to connect the "two batteries'" [2 AGMs in Hawk and 1 AGM in parallel] and the charging system from any source now charges both. 7611 will open the relay if a voltage of 12.75v is metered when the relay is closed or if the 'auxiliary' battery [Hawk] voltage drops to 12.25v when the relay closes. 12.25v is to keep the relay from cycling back and forth from closed to open as the alternator voltage varies on start-up.
Whew! So can you damage either the Hawk "bank" or the Tundra battery by leaving the Tundra on the Battery Tender hooked up while the IOTA and or solar are inputting amps/volts by over charging the batteries; no, as the relay will open if voltage in either exceeds a lockout voltage of 16v...which should not be reached in an AGM is my understanding [?] unless a charger goes haywire...and the two battery systems will be charged simultaneously from any source producing power once the voltage of either drops below the 13.6/13.0 thresholds.
The rate of charge from the alternator, Battery Tender, solar or IOTA is still an unknown and depends in three instances on the rate of the smart chargers input [IOTA and Battery Tender and Zamp ZS 30 amp Controller] and on the alternator output [rpm/time] or on solar output [watts and current amps produced] when measured.
Hence I will take Vic's idea and try to view the approximate battery SOC changes from these 4 sources when I get the 712 installed.
Blue Sea said that they do not have an ACR for LiPo4 batteries; what are the folks with LiPo4 batteries using as an isolator? He did say the the truck and Hawk batteries need to all be the same type of battery [AGM..etc.]; so if in the future I go to Li batteries in the Hawk, I assume that means a new Li battery for the Tundra.
If I confused this information or miss-stated it, please feel free to chime in.
Thanks,
Phil