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Main Buses Away From Battery?

Old 06-29-2016, 09:08 PM
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Default Main Buses Away From Battery?

I'm considering an upgrade of the heavy duty electrical components.

I have a 6m Alloy Trailer Boat, with twin outboards (70HP 2 stroke) and a forward helm/cuddy.

The two starter batteries are in separate lockers in the aft corners of the boat, with master switches and a parallel link switch.

There is no space for bus bars, CBs etc near the batteries. But I still have to connect my winch and bilge pumps to one starter battery. Currently they all separately connect to the main switch and it's untidy.

What I would like feedback on is running heavy cables from Stbd start battery switch (+ cable via a circuit breaker) to a forward node (under helm) with;
a) Heavy bus-bars (+ & -).
b) CBs for the two + bilge circuits (switches in helm).
c) CB breaker for the winch
d) VSR for charging the house battery (located up front).

I will of course appropriately select cables for load and length and CBs for cables.
Old 06-29-2016, 11:06 PM
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Why are you running the bilge and winch off a start battery? Run it all off off the house. Run a single pos and meg from start battery to house battery for vsr. Use Bluesea mrbf fuses at both ends . No space needed.

Put house switch and bus bars up front
Old 06-30-2016, 12:35 AM
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[QUOTE=smac999;9193455] Why are you running the bilge and winch off a start battery?
Run it all off off the house. [/QUOTE

I turn the house circuit off when the boat is on the mooring, but I still want the bilges to run.

The start battery has more capacity than the house battery will, so will power a bilge pump for longer.

I have two start batteries (i.e one redundant) so if one goes flat I can still start both engines. But will only have one (small) house battery.

Running a winch off the house battery risks transient voltage spikes damaging electronics. They are rare but they happen - ask my dead $1k fishfinder

Powering the bilge pumps off a start battery reduces overall circuit length.
Old 06-30-2016, 12:41 AM
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Why a MRBF rather than a CB and why a MRBF at both ends?

So no problem with the bus bars at the front then?

Originally Posted by smac999 View Post

....

Run a single pos and meg from start battery to house battery for vsr. Use Bluesea mrbf fuses at both ends . No space needed.

Put house switch and bus bars up front

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