While the Yandina does allow remote
control to force a combine for charging, it does not use a large enough relay to use it for combining buses when starting.
The Smartbank combiner and the large Blue Sea ML-ACR 500amp models can be used in this way.
Now before you protest that you should never start off combined batteries, that's not how you would configure it.
When a boat uses a "three-switch battery management" approach, one of the switches is used for "Emergency-bus-connect" to tie the two buses (House and Engine) together. As you probably know, in such a config, when you want to start the engine
from the House battery, you turn OFF the Engine
battery switch and turn ON the "cross-connect" switch, as I prefer to call it (distinguishes it from the older "Battery Combining" approach).
One typically also has an ACR to tie the two battery banks together when charging. The ACR is typically connected directly to the two battery banks before their switches. If you relocate the ACR to where the cross-connect switch is, you can use the manual/remote feature of the Smartbank combiner to replace your cross-connect switch. It then allows you to eliminate the mechanical cross-connect switch with no loss of functionality. I installed that setup on a Jeanneau
45 using the Blue Sea 500-amp ACR and it works well. Since in this configuration the ACR will carry starter current
if you start from your house batteries, it needs to be rated to do so. The Smartbank combiner and the Blue Sea ML-Series is, while the Yandina is not.
The Yandina is a fine device in its own right and is much smaller and less costly, but if you want to use a combiner as a remotely controlled bus "Cross-Connect" switch you need to use the Smartbank or BlueSea ML-ACR.
I can provide an explanatory diagram if need be, but don't have one handy.