Thank you for picking up on this one Al!
The installation is on a 44 fot sailboat, with a Volvo Penta D2-55 engine, with two Delco 28si 200A alternators attached to it, one WS500/alternator. The house bank is 1200Ah Winston, with a REC ABMS managing it, connected to both WS500 and a CerboGX over CAN.
There are two reasons why I wired up the feature in switch to the helm.
I guess we are typical weekend cruisers most of the year, and prefer to "store" the batteries at about 50% SOC when not in use. When we go home after the weekend, it would be great to activate the switch, and not charge the batteries on the way home. Forcing to float, would slowly charge the batteries to desired SOC (typically by setting float to 13.1 or 13.2V).
The Volvo is not that powerful, and the boat is quite heavy. Sometimes it is needed to "unload" the alternator load from the engine (like when going upwind in heavy weather, or doing some kind of "get away" manouver. Pushing the button, will release aprox 5-6 hp, which is significant.
Half power mode, could propably solve usecase 2 more or less, but not completely.
Based on the manual, I was really expecting this to work already. The extensive manual is great, but I cannot remember to have seen anything about the slave mode consequenses when connected to a BMS like in my setup.
Really hope this can be includede in your next release ;)
BR
Sturla
