Shore Power Electrical Wiring Help

I have a pontoon boat that I recently purchased that came with a gas motor and I've swapped it for an Elco EP-5 because I live on an electric only lake. Before launching the boat, I decided to re-write it with two electrical systems: a 12 V system for accessories and a 24V trolling motor system. I have separate batteries for each system.

The 12 V system only has a few LED lights on it, possibly a fish finder, and a motor tilt and trim. This system has a single 12 V marine lead acid battery.

The 24V system consists of two 24V/100ah batteries in parallel connected directly to the motors.

My original plan was to install one of these connectors on the side of the boat and just run an extension cord to charge all the batteries. I have a trickle charger for the lead acid battery and a different charger for the 24V batteries. This is the extension cord I was planning on using and I was going to plug it into a GFCI outlet.

After doing some more reading today, I am having my doubts about the safety of this system. In an ideal world, I would be able to just park our pontoon and plug it in without removing the batteries.

Thanks in advance for the help.

 

You have 20A @ 28V = 560W and a trickle charger 1.5A @ 14V =21W. Your total charging is approximately 574W. Assuming you are using fairly efficient modern chargers, they may consume less than 650W, which translates to less than 6A. A 12 awg cord will be more than enough for that current.

 

Thanks Gonzo. A silly mistake by me.