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how do onboard chargers work

by , Posted to on 03/24/2008 12:38 PM | "Quote" | "Quick Reply" |

Joined: 12/16/2001
Location: ND
im guessing they only charge your trolling batteries while the boats running so how long does it take to charge a couple batteris (24 volt) when there dead
Re: how do onboard chargers work
by on 03/24/2008 12:51 PM | Reply #1 | "Quote" | "Quick Reply" |

Joined: 01/09/2002
Location: ND
The most common onboard chargers are simply permanently mounted, waterproof, battery chargers that you plug in back at home to recharge your trolling batteries. Fairly pricey at about $150 for a 2 channel system (charging two batteries at once)

However, there are battery chargers in the design which you mentioned. These use the main motor to recharge your trolling batteries while the main motor is running and stops the sending of electricity to your trolling batteries once the big motor is shut off so you don't drain your starting battery. I found at least one through Cabela's, but I don't recall if it was made by Minnkota or someone else. I do not know how long it would take to recharge a set of dead 12 V batteries this way. I assume it would take a little bit of running around the lake. Maybe an hour or two? I think it ran just under $200.

Oh to only have money be no object.....

What I have done in the past is carry jumper cables with me for when the trolling battery runs low. Not the most efficient way of recharging the trolling battery even though it does work.

I even looked at solar years ago for when I would camp long weekends on the shore of Sak and didn't have a power bush. Not a great idea as it took a very large solar panel to be acceptable. After doing the math, it would have taken days to recharge the battery with a reasonably sized solar panel. And again, not cheap.
“Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.” ~ Mark Twain
Re: how do onboard chargers work
by on 03/24/2008 12:57 PM | Reply #2 | "Quote" | "Quick Reply" |

Joined: 01/09/2002
Location: ND
I was a little high on the DC onboard charger. Just relooked and a reasonable one is about $120.
“Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.” ~ Mark Twain
Re: how do onboard chargers work
by on 03/24/2008 1:17 PM | Reply #3 | "Quote" | "Quick Reply" |

Joined: 12/16/2001
Location: ND
As Allen mentioned there's two kinds of On Board chargers. AC & DC. Usually, when people talked about On Board chargers they meant the AC versions as there wasn't much on the market for DC ones. This year Minn Kota has come out with a new DC charger that runs from $99 to $150 depending on the model. It hooks to the main battery on your boat and has leads that go to your other batteries. Once the main battery is fully charged, this charger then starts sending power to your other batteries. Typically one would not use this for fully charging their batteries and would instead use an AC style for that. The DC chargers are typically used to refresh your other batteries while you're moving from spot to spot. How long it would take would depend on the amount of power you're main battery's using for your other electronics, how low your main battery is when you start running the main engine, and the output of your main engines alternator.
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Posted On: 03/24/2008 12:38 PM
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