can anyone tell ma how to use to batteries for my boat.
i would like one to run the motor only.
one to run all the radios,lights etc.

thanks

sonofadocker

1980 wellcraft cc 85hp
1975 sportcraft cuddy 150hp

"sonofadocker" wrote in message
oups.com...
can anyone tell ma how to use to batteries for my boat.
i would like one to run the motor only.
one to run all the radios,lights etc.

thanks

sonofadocker

1980 wellcraft cc 85hp
1975 sportcraft cuddy 150hp



You will need a dual battery switch. This is one example of that switch:
http://images.westmarine.com/full/115081.jpg

The manufacturer will provide a wiring diagram with the switch. This also
may help: http://www.bluewatermarinesvc.com/html/bat_switch.html

You want to add a deep cycle battery to power accessories. The starter
battery should be used for just that purpose. In a pinch, the deep cycle
battery will probably start the boats you have listed as well. The proper
switch is a must, and an automatic charging relay will make your life very
simple.

--Mike

"sonofadocker" wrote in message
oups.com...
can anyone tell ma how to use to batteries for my boat.
i would like one to run the motor only.
one to run all the radios,lights etc.

thanks

sonofadocker

1980 wellcraft cc 85hp
1975 sportcraft cuddy 150hp

On Apr 4, 7:53?pm, "Mike" wrote:
You want to add a deep cycle battery to power accessories. The starter
battery should be used for just that purpose. In a pinch, the deep cycle
battery will probably start the boats you have listed as well. The proper
switch is a must, and an automatic charging relay will make your life very
simple.

--Mike


If rated for sufficient amperage, a "deep cycle" battery will do a
dandy job of starting the boat.

Odds are that even with careful management, the "starting battery"
will become accidentally discharged every so often. The light duty
construction of a cheapie "starting" battery won't stand up to very
many recharges before the plates start crumbling.

Better to get two deep cycle batteries, both of them rated for enough
amperage to start the boat, and use one for house and reserve the
other for starting.

Better to get two deep cycle batteries, both of them rated for enough
amperage to start the boat, and use one for house and reserve the
other for starting.

No argument there, but most likely that would mean replacing both batteries.
Most boats that size come with a starting battery, nothing more than's
needed. If you are to add a second battery (and keep the original), a deep
cycle is the best way to go to run the accessories. That was the point I was
trying to make.

--Mike


"Chuck Gould" wrote in message
oups.com...
On Apr 4, 7:53?pm, "Mike" wrote:
You want to add a deep cycle battery to power accessories. The starter
battery should be used for just that purpose. In a pinch, the deep cycle
battery will probably start the boats you have listed as well. The proper
switch is a must, and an automatic charging relay will make your life
very
simple.

--Mike


If rated for sufficient amperage, a "deep cycle" battery will do a
dandy job of starting the boat.

Odds are that even with careful management, the "starting battery"
will become accidentally discharged every so often. The light duty
construction of a cheapie "starting" battery won't stand up to very
many recharges before the plates start crumbling.

Better to get two deep cycle batteries, both of them rated for enough
amperage to start the boat, and use one for house and reserve the
other for starting.

"sonofadocker" wrote in message
oups.com...
can anyone tell ma how to use to batteries for my boat.
i would like one to run the motor only.
one to run all the radios,lights etc.

thanks

sonofadocker

1980 wellcraft cc 85hp
1975 sportcraft cuddy 150hp


To do the job right, will take 2 switches and a battery combiner. A Guest
(or Perko) dual battery switch and a separate switch to shut off power from
the accessory battery. The dual bat switch allows you to switch to the 2nd
battery for starting if the starting battery dies. Run the starting battery
in position 1 and use the combiner / isolator for connecting the 2 batteries
together when charging and you will need a 2nd on/off switch to disconnect
the 2nd battery from the electronics, etc when parking the boat.