Who knows, once would be too many though. I dont skimp
pennies hoping that wouldnt happen!

Bob


"Calif Bill" wrote:

But how many times are you putting 65 amps into the battery.
Bill

"Bob" wrote in message
.. .
Bill,

Thanks, I checked Mercury's website and the engine
has a 65 amp alternator
http://www.mercurymarine.com/350_mag_mpi_sd_-_300_hp

In this case, I should probably get something larger
than the 50 amp, do you concur?

Bob


"Calif Bill" wrote:


"Bob" wrote in message
.. .
I have a 22' Chaparral with a Merc 350 300HP. I do a lot of lake
boating, long days, and would like to have a reserve battery to start
the boat in case the primary drains while docked or just for
emergency.

I'd like to wire in a combiner and switch as show here
http://www.skingcompany.com/manuals/C50.pdf

I am not sure what amp rating I need for the combiner and switch. Can
someone help with this. I don't care about saving pennies, want the
best system for safety.

Thanks,
Bob

Get a Guest Dual battery switch, West Marine or any other marine
supplier.
A 50 amp combiner as you do not have a 100 amp alternator likely on a 350
cid engine. The 50 amp combiner is $80 at West, hook the two batteries
together with the combiner, I did it at the Guest switch. Instructions
in
the combiner. I run my electronics off the second battery and added a
single battery switch in the feed to the fuse panel, so I can shut off
all
the power in the boat. You can add a small switch in the combiner to
shut
it off, if you want to charge only one battery. I did not.



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