But its only redundancy if everything is independant. So independ batteries, independ fuel. Some would say fuel filled up at different places per tank!
But with redundancy comes:
- Extra Weight
- Extra Service Costs
- Twice as likely to have a fault. (Makes you believe you need the redundancy more!) And so twice as likely you don't actually go out because you wont head off with just one engine working
- Higher fuel costs
Redundancy appeals to me too, but I think I will stick with the plan of using an aux until I start using the boat places that if something breaks I will die while trying to start the aux ;-)