Onboard Charger 210 FSH Sport with Trolling Motor

[Dumbassbass]

I guess I don't understand on why would need to charge the starter battery. I have 4 batteries in my boat. Starter, House (AGM TPPL), and two Trolling Motor Batteries (LiFePo4). I have a NOCO on board 4 bank 40 amp charger. I have each bank connected to a battery. I watch when I turn on the charger and the starter battery is basically topped up and goes into maintenance mode with a minute or so. Not sure I even need a bank on it.

Perhaps if I was wired differently it could make sense, but everything in my boat runs off the house, except for the trolling motors of course. The only thing hooked to my starter battery is the engines. Thoughts?

In most cases true on the starter battery being charged however the newer chargers play a very important roll in battery health and longevity with the maintainer phase as well as de-sulphanating of the battery plates (this is what causes most batteries to prematurely go bad)

 

[HangOutdoors]

Actually Minn-Kota just announced soon to release a 5-bank capable of LiFePO4 (I wish they would have last year)

https://minnkotamotors.johnsonoutdoors.com/battery-chargers/board-precision-chargers?id=30621&force-country=US&gclid=CjwKCAjw0qOIBhBhEiwAyvVcfzB5fUQhV2m15VN4N5C5gQQ-mOcoVCS30DYdkcOW6Zj8WVG1RudXxRoCVUsQAvD_BwE&gclsrc=aw.ds

That charger looks solid. It is 3lbs lighter with and extra bank over the one I have.

NOCO - 4-Bank 40A On-Board Battery Charger - GENPRO10X4

If the day ever comes and I am allowed and lucky enough to do a 25' FSH, that Minn Kota charger would be sweet on it.

 

[JASmith]

I guess I don't understand on why would need to charge the starter battery. I have 4 batteries in my boat. Starter, House (AGM TPPL), and two Trolling Motor Batteries (LiFePo4). I have a NOCO on board 4 bank 40 amp charger. I have each bank connected to a battery. I watch when I turn on the charger and the starter battery is basically topped up and goes into maintenance mode with a minute or so. Not sure I even need a bank on it.

Perhaps if I was wired differently it could make sense, but everything in my boat runs off the house, except for the trolling motors of course. The only thing hooked to my starter battery is the engines. Thoughts?

You would be fine most times I am sure. Personally I like all batteries being maintained when I'm not using the boat, weather it's a week or a month at a time. Non Lithium batteries can drain up to 3% charge per day just sitting, more so if they are old or lower quality even. If it's sitting for a month, it could be dead.