400 express 110 to 12 volt converter question.

• Aug 20, 2018

• #1

jonsm114

Active Member

Sep 4, 2015

250

Defiance, Mo

Boat Info

1996 400 Express Cruiser

Engines

7.4 MPI Mercruisers

i have the factory converter in the boat and when in port on shoreline, I always keep it on. A friend advised that that is a no,no and will ruin my batteries? I am confused as I thought that the converter was for utilization of the 12 volt items on my boat when in pot\rt on shore power?

Thanks for any help...

Jon

 

• Aug 20, 2018

• #2

Air O'Nautical

Well-Known Member

Feb 5, 2008

2,316

Port Saint Lucie Florida

Boat Info

1995 400EC. Raymarine E80, Tridata, 4kw dome, Garmin 943

Engines

2013 7.4L Mercruiser Blue water.
Hurth straight shaft 630's,
Westerbeke 7.0 BCG

You are correct.
It’s basically your battery charger.
Just check your battery’s water often.
Always on while the main engines aren’t running.

 

• Aug 20, 2018

• #3

jonsm114

Active Member

Sep 4, 2015

250

Defiance, Mo

Boat Info

1996 400 Express Cruiser

Engines

7.4 MPI Mercruisers

Air O'Nautical said:

You are correct.
It’s basically your battery charger.
Just check your battery’s water often.
Always on while the main engines aren’t running.

Click to expand...

Thanks, The batteries are sealed, Marine, Group 31s, new in the spring of 16. The local sea ray salesman told a friend of mine that just bought a 06 340 sundancer from him to never leave the converter on. Heck, I leave it on all the time and the batteries are fine. Thanks for the response.

 

• Aug 30, 2018

• #4

insfnds

Member

Jul 8, 2008

122

Canyon Lake, TX

Boat Info

2000 380 Sundancer 'Cinco'

Engines

Twin 454 Mag V-Drive

If that is the original charger/converter then your friend might be right - it is not an automatic charger, it may overcharge your batteries. If you have a newer smart/automatic charger then you can leave it on all the time.