I was thinking the same thing as David....sounds redundant. My understanding of the Blue Sea ACR is that it drops off when the house bank (master bank) voltage drops below a certain level lower than 13.0V. Same with the DuoCharge.
I don't have one of these, but it's my understanding that the Blue Sea ACR shares charging current when available and the House bank is sufficiently charged to the 13+ V. The loads on the Start batt are not shared through the ACR or the DuoCharge units with the House bank...only the charge, unless the "combine function" is used to allow the banks to share the start load. (See the note at the bottom of this page of specs. https://www.bluesea.com/products/761...12_24V_DC_120A
I have a Yandina Combiner and it has provisions for a remote switch for Auto/Off/On. The Auto position if the default if no switch is installed and allows the combiner to tie the banks only when the charge is present and voltage parameters are met. The OFF position defeats the combiner and prevents its connecting the banks when charge is present, regardless of voltage. I use this when I don't want the charge shared with the start battery (e.g. the house needs a charge and the start is full). The ON position overrides the units parameters and allows the banks to combine with or without charging present. This is essentially the same as placing the battery switch to ALL. Both batteries will share the charge current as well as the house and start loads.
What's the advantage to having a Balmar Duo Charge and a Blue Sea ACR on the same pair of banks?