Limit input current of Orion-Tr 12|12-30 DC-DC charger

DIY
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1

Is there any option to limit the input current of the Orion-Tr Smart 12|12-30?

I probably made a mistake when I purchased that DC-DC charger. As the starter and house battery of the boat are both minus-grounded via the propeller-shaft, I figured that the non-isolated variant suffices. Hence, I took the smallest non-isolated Orion-Tr Smart which was available and that is the 30A version. However, the alternator can only provide 25A safely and besides the input circuit of the Orion-Tr Smart the starter battery also draws some current.

What can I do? Buy the isolated variant 12|12-18? Isolation isn’t actually required, but at least the current below 25A and hope that I can re-sell the non-isolated 12|12-30? Any settings which I have missed in the Orion-Tr Smart 12|12-30 firmware?

On the downside, the isolated variants do not seem to support VE.Smart Network. My house battery is also charged from two MPPT 75/10 and an Phoenix Smart IP43(1+1) 120-240V with a BMV-712 in an VE.Smart Network.

2

Nagmat84, I guess being a smaller Orion-Tr will not solve the problem you have. A smaller Orion-Tr will only be able to pass-through a lower current safely.
In fact it might cause you more trouble, like getting over-heated (although a protection seems to be build-in to protect the device). The documentation on the Orion-TR’s does not show an option to reduce input current from your alternator. Your alternators internal regulator will reduce the current as soon as its consumer (in this case your battery, probably) is reaching its Float-stage.

The stand-by current it draws form the starter battery is less then 850mA. Are you sure this is a threat to your starter battery?
In case it is a threat, you could consider a small solar panel/converter to keep you starter battery charged when left unattended over a longer period of time.