On my narrowboat, I have a multiplus compact with engine driven Alternator with standard regulator (mobiletron vr lc111) to deliver charge to a bank of 4x105Ah leisure lead/acid batteries. This works fine on its own. This was already there when I bought it.
I've installed 450Pw of solar through a victron mppt 150/45 and that works fine in isolation too. (wired into main battery +/-).
I believe both boxes are set to default settings.
The trouble comes when I switch the engine on there is an immediate bad egg smell from the batteries, indicating overcharging and the mppt appears to get very hot. I am assuming too much current is being delivered to the batteries or voltage is too high if that makes any sense!?
I can get by, by switching off the mppt charging through the app whenever I switch on the engine, but that's not optimal.
Is there a way to change settings to force the Alternator charging to back off, when there is enough solar charge current being delivered? I can't find anything in a manual or searching this forum.
Is possible I need to buy a smarter regulator for my Alternator to allow it to work in tandem with the mppt, happy to receive product suggestions.
Will happily provide more info as directed.