diver_dave
Advanced Contributor
""quote: "it suggests
""quote: "it suggests connecting all the negative cables from the batteries to a common ground"
Just my two cents here:
One reason that I can think of for this not being advisable would be redundancy!
There is no redundancy if all Battery Bank Neg cables attach to a common "remote" or "OFF engine" location/termination point (if I understood you correctly).
With each battery bank having their own engine termination point, you now have redundancy, should one fail.
A Negative Buss is great for subsequent D/C circuits."
I don't think breaking or loosing the 600AMP rated ground hub is a risk. If you use the Blue Seas item, it uses 3/8" hardware into a very substantial tinned copper one piece slab. The much more significant risk is a loose ground cable to an engine or battery. The single point ground method will reduce the potential of very high currents flowing thru small wiring, if/when the large conductor is compromised. Neither wiring method (direct to engine vs single point) will expand a port engine wiring failure to the stb side as well. But, I'm at least partially convinced the single point method may prevent burn-up of small wiring during a starting attempt with a bad ground on one engine.
I'll definately NOT recommend a single ground stud to mount both port and stb side heavy cables. THat's a very bad idea. The bolts need to be independant to offer the redundancy RM suggests. "
""quote: "it suggests connecting all the negative cables from the batteries to a common ground"
Just my two cents here:
One reason that I can think of for this not being advisable would be redundancy!
There is no redundancy if all Battery Bank Neg cables attach to a common "remote" or "OFF engine" location/termination point (if I understood you correctly).
With each battery bank having their own engine termination point, you now have redundancy, should one fail.
A Negative Buss is great for subsequent D/C circuits."
I don't think breaking or loosing the 600AMP rated ground hub is a risk. If you use the Blue Seas item, it uses 3/8" hardware into a very substantial tinned copper one piece slab. The much more significant risk is a loose ground cable to an engine or battery. The single point ground method will reduce the potential of very high currents flowing thru small wiring, if/when the large conductor is compromised. Neither wiring method (direct to engine vs single point) will expand a port engine wiring failure to the stb side as well. But, I'm at least partially convinced the single point method may prevent burn-up of small wiring during a starting attempt with a bad ground on one engine.
I'll definately NOT recommend a single ground stud to mount both port and stb side heavy cables. THat's a very bad idea. The bolts need to be independant to offer the redundancy RM suggests. "