Battery charging over winter

[sb in gp]

This may be a dumb question, but...

I keep my boat stored in a heated building during the winter, and I have access to a 110v wall plug in the building.

On my previous boat, 44DB, I had two 30amp 110v shore power cords, so I figured out which cord fed the battery chargers and I was able to periodically top off the batteries by running an extension cord from the wall to one of the 30amp connectors using an adapter.

Now I have a 2017 460DB with a single 50amp 220v shore power cord. I can buy an adapter that will allow a 50amp to plug into a 15amp 110v extension cord, but my gut tells me that this will not work because it will only power 1 leg of the 220v.

I have a Pronautic 1250P charger on board. What is my best option for topping off batteries over the winter?

Thanks,

Scott

 

[sbw1]

Put your boat away with the batteries fully charged and then turn off all of the breaker switches. You do not need to top the batteries off while in storage. They will be fine in the Spring when you are ready to go boating again.

 

[paulswagelock]

This should power both legs of your panel, just not at 220v, so shut off any 220 breakers your might have.

 

[Wylie_Tunes]

That charger is designed to be plugged in over the layup. It will maintain the batteries without your intervention (plugging in/unplugging time to time), so plug it up and forget it. You also want to power down any system, no need for the charger to supply unnecessary loads drawing off the batteries of a boat stored out of the water.

 

[sbw1]

OPr should read his storage contract and determine if his marina allows boats to be plugged in for the duration of lay up. I suspect many marina owners frown on running equip on a continuous basis during storage due to the risk of fires.

 

[sb in gp]

I do have restrictions on leaving boat plugged in, so I only do it periodically. I'll watch the voltage and wait for it to get below 12 before topping off.

So no harm in using an adapter to plug a 50amp into a 110v outlet, as long as I shut down everything except the battery charger?

 

[paulswagelock]

If you regularly let it get to 12v, the battery will be toast, that is 75% discharged. Don’t let it fall below 12.4.

 

[Coz]

I do have restrictions on leaving boat plugged in, so I only do it periodically. I'll watch the voltage and wait for it to get below 12 before topping off.

So no harm in using an adapter to plug a 50amp into a 110v outlet, as long as I shut down everything except the battery charger?

If the charger is wired to the 1 leg that the adapter is wired to, it will work. Otherwise it won’t. If there are any 220V breakers in the boat, make sure they are off.