can I connect a Victron smart 30amp charger to the input side of the Orion DC-DC charger, to keep both starter and leisure battery’s full charged when the engine is stopped. my thinking is, its the same as if the Alternator is running.
A few more details would be useful to identify exactly what you are considering, the post is ambiguous.
Do you mean can you add an ac powered charger with its DC output connected to the Orion input. If this is what you mean then the answer is yes.
As long as the charger has a higher output current that the Orion DC to DC charger.
The Victron IP22 Smart charger is 12 volt 30amp.
The Victron Orion-Tr smart charger Non-Isolated.
Leisure battery’s x 2, are 12v 100amp Lithium iron phosphate.
Starter battery is 12 V 90amp wet flooded.
OK, if you place the ac charger onto the input of the Orion then that will be OK.
I have not reviewed the in detail, but one comment I will make is all the resettable breakers you show have a very poor reputation for poor contact resistance, overheating and not breaking at the correct setting. Consider either using reputable brands such as Blue Sea or swapping to isolators and fuses.
Thank you for your input and advise,