Now that the crux of this discussion has turned to reliability its worth thinking about this in relation to the battery equaliser solution I mentioned earlier in this thread. http://www.solarconverters.com/
In this case the load is coming from one of four propulsion batteries in a 48v pack. If the equaliser fails, you still have supply to your critical 12v equipment such as bilge pump and radio.
And seeing that the converter has failed you'd be wanting to take notice of the voltage of the tapped battery using, say, a multimeter. If its voltage drops to any concerning degree simply reconnect the 12v load to another battery of the series. And continue manual monitoring. And swap again if necessary.
Charging of the 48v pack continues as normal (whatever normal is, such as regen or solar).
It seems to me that this solution is can easily handle the failure situation. Even if you are crossing an ocean, or otherwise remote from repair facilities.
Cheers
Chris
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