question

Does this mean that each output of the charger is only 10A when the charger is declared with a capacity of 30A?

No.

This is a dynamic system where the most emptied battery receives more current first. The sum of current coming out of the 3 outputs is 30A.

I would be interested to know how much current the second service battery is charged with when a load of about 25A is connected to it and the starter battery is full?

No more than 5A for sure.

Also, be careful, a new charging cycle can be started in function of charging profile configuration.

See section 4.3 of the manual.

https://www.victronenergy.com/media/pg/Blue_Smart_IP22_Charger_manual_230V/en/operation.html

Finally, the elephant in the room

There is only one charging profile in the IP22. As you have different battery chemistry, it is better to use a different charger for each battery. The charging profile of a LiFePo4 and Lead batteries are not the same. Recipe for a disaster...

-François

Thank you for the explanation. I think that the BMS in the battery takes care of the charging curve for LiFePo4 independently of the charger. I guess that shouldn't be a problem? But I am worried if the charging current of the charger for the service battery does not reach the charging requirement when it is under load.