Guests - If You want access to member only forums on FM. You will gain access only when you Sign-in or Sign-Up on Fishing Minnesota.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
huntingislife

Charging batteries with idling vehicle?

13 posts in this topic

There has been some talk in the ice fishing forum about charging your ice house batteries with an idling vehicle. You have to use the 7-pin connector to run the charging wire to the ice house. Would it essentially be the same thing to use jumper cables and hook the vehicles battery directly to the ice house battery? Then let the idling vehicle charge the ice house battery. I was searching on the internet and found some people who say that an idling vehicle doesnt deliver too many amps and it would take a long time to charge. Other people say that an automotive alternator is designed to just maintain battery levels and not be used as an actual battery charger, so there could be damage that occurs to the alternator. Is there any truth to this?

Share this post


Link to post
Share on other sites

I would say yes and no. It doesn't deliver maximum charge at idling speeds. Its not turning the alternator enough. An alternater in a car does charge though, its not like a magneto on an ATV that is more for maintaining and doesn't usually have the power to charge much as I understand them...

Share this post


Link to post
Share on other sites

I agree with both points. A car alternator typically does not provide a ton of current at idle (although the newer ones seem to do a better job) and it's purpose is to maintain the battery and load, not to be a charger per se.

Share this post


Link to post
Share on other sites

I teach auto mechanics and have used my truck to charge batteries for years. If you have no other way of charging them where you are it works just fine. The alternator will put out more amps up off idle but it will act as a battery charger at a low setting, maybe up to 10 amps. The alternator doesn’t know if its charging the battery in your truck or providing juice for the ignition system. Not only will the alternator charge the battery but your truck battery it self will also help charge the other battery. A battery will only accept so much charge and then the alternator will also stop trying to give it as much charge, and try to just maintain the battery. Will this take time to charge the battery? YES even on a charger it takes several hours to fully charge a battery. I would have an alternative way to charge for the long run but it will and can charge the batteries with out doing damage. The damage will come from people putting cables on negative first and causing a voltage spike. That can knock out voltage regulators in the alternator. Hope this helps. smile.gif

Share this post


Link to post
Share on other sites

Also, if you plan to do this you would be better off to just use jumper cables. Less heating in the cables, and probably a lower chance of blowing a fuse or burning off a wire somewhere.

Of couse there is alsways the option of just carrying a 2nd battery....

Share this post


Link to post
Share on other sites

I would hook up my 12v power inverter to the truck battery and use my regular battery charger.

Share this post


Link to post
Share on other sites

I have been charging the fishhouse battery, (and camper,trailer etc.) for years off of the 7 pin connector. That it why it is there, the wiring and circuit protection is heavy enough to do the job, while at idle it will take considerably longer, it will still do the job. Depending on the size of an inverter and the output of an a/c battery charger, you will be asking far more from the alternator while the inverter is doing its job than using the battery charge pin in the trailer connector.

Share this post


Link to post
Share on other sites

Quote:

I would hook up my 12v power inverter to the truck battery and use my regular battery charger.


I don't have the math on this, but I'm pretty sure that you'd be loosing a lot of efficiency there by converting 12V to 110V back to 12V.

marine_man

Share this post


Link to post
Share on other sites

As already stated you can charge your ice house battery with your vehicle. Thing is do your really want to do that.

Lets say you charge at 10 amps and you have a 115 amp hr battery.

If its dead it'll take 15 hours to charge while you burn 1 gal per hour idling.

I would get myself enough deep cycle batteries to last me the weekend. I'd also wire my lights and direct vent heater separately. Why because your furnace won't allow allow the valve to open the gas supply under a certain amount of voltage. So you swap out the battery and run the battery till its dead with your lighting.

Share this post


Link to post
Share on other sites

What if you have an inverter hooked to your deep cycle to run a tv and a few lights in your ice house. The battery starts getting low. If you hooked the battery to your 7 pin charging system on your truck, while the deep cycle is still connected to the inverter, would you have the juice to power your tv and lights? Would the battery gain any charge or would all the juice just be running from your truck, through the battery and to the inverter?

I currently have one battery hooked to an inverter and I'm thinking the 7 pin charging system would allow me to leave the battery in the house and just hook it to the truck for an hour.

I'm not buying the 15 hours to charge a battery with an alternator. If that were the case it wouldn't be possible to jump start a battery and then restart the vehicle after an hour of driving. Doesn't the stay'ncharge system use this theory of charging batteries from the alternator, I don't recall it taking 15 hours with their system.

Share this post


Link to post
Share on other sites

where would I be able to find a 7 pin charging system? A buddy has a cabin up north, okay it is a shed, but we use it in the summer and we lost our battery last summer on the 2nd of 5 nights, which meant no fan, did I mention it was day time highs of 95? being able to charge that battery as we drove to and from Mille Lacs would be awesome, or at least let the truck idle for a while every night at camp too.

Thanks..........

Share this post


Link to post
Share on other sites

I'm using the 10 amps that was stated already as a guide to how long it will take to charge a 115 amp hr battery. Simple math, 115 divided by 10 = 15. Your talking about the same rate as a battery charger, 15 hours isn't out of the norm.

Jumping a car battery with jumper cables or your trucks designated battery connected to battery cables is different then a 7 pin plug with light wire. Still the jumper cables are limited because you have to take in to consideration jumper cable clamps are only capable of handling so many amps.

Lastly I won't put a dead battery on my trucks charging system. I won't subject a deep cycle to it either.

Share this post


Link to post
Share on other sites

Quote:

As already stated you can charge your ice house battery with your vehicle. Thing is do your really want to do that.


Yeah, I agree. Even if it does charge, who wants to idle their vehicle for 3, 4, 5, or more hours? I've always believed that idling a vehicle is not too good for them.

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  
Followers 0



  • Posts

    • ozzie
      169 overpass (293rd or county 9) north of Zimmerman...take the off ramp and go east (right) to county 19 take a right going south through the S curve and hang a left at the end of S curve on 289th Ave take that about 2 miles to Blue Lake Dr take a right and then take your first left a couple blocks later to the landing.
    • Monkster
      We're a little over a week away from the 6th annual LCRA Ice Fishing contest on Lake Gervais in Little Canada, MN! Lots of great prizes, over $10,000 in prizes and raffle. Grand prize for fishing is a Marcum flasher, a Clam X200 flip over thermal and an Eskimo auger! Come on out Saturday, February 4th, noon to 3pm. Line up early for a good spot, the tent will open by 9am with beverages (alcohol and non-alcohol), food and raffle tickets. The raffle is the LCRA's winter raffle. $5 tickets, grand prize is a trip to Vegas and $1,000 cash! You don't have to be present to win in the raffle, that will be drawn after the prizes for the fishing contest around 4pm that day.   The Little Canada Recreation Association is a non-profit group that raises money to offset registration fees for youth in the Little Canada, Roseville, Maplewood and Vadnais Heights areas. We also fund scout projects, playground equipment and many types of sports equipment for area teams.   For more information on the LCRA or to register for fishing, go to www.lcraonline.org  
    • Cliff Wagenbach
      Thanks Del! Good information source on local conditions! Cliff
    • Fishin machine
      So as far as live bait rigging what works best? Shiners? Suckers? Fatheads? As far as this time of year goes.
    • CousinEddie
      Like someone else said, some of the places with the old school $2-$5 beer and $6-$10 burger pricing have also been owned for a long time and were paid off long ago. According to the county website, the landing has 300+ feet of lakeshore (which isn't cheap), a tax bill that's 3 times what the VC pays, 10 times the dock space to maintain and given that it's was purchased relatively recently, they likely a mortgage to pay. The Crescent is also a relatively recent purchase. But the Crescent has a less expensive location, lower taxes and is more centrally located in terms of road access (important during the 4-5 months of the year when boating and snowmobiling taper off).   Overhead is going to play a role in the pricing of any business. You have your total sales minus your overhead and that's your profit. You can't sell the same thing at the same price with significantly more overhead because you're not going to make any money. Yes, you can offset low margins with a higher number of sales, but with a very short snowmobile season and a relatively short boating season that can be pretty difficult.   I'll be the first to agree that the pricing is on the high side, but the food is also a step up from some of the other options with lake accessibility. My guess is that after evaluating the various price points, the owners decided that the current business model is where they stand the best chance at turning a profit and keeping the doors open. If $2 beers and $5 burgers were a slam dunk way to make money, I'm sure that they'd be doing it because it would be a lot easier.   Whether it be lakeside bars/restaurants or marinas, there are less and less of them every year because the cost of lakeshore and the taxes (which usually increase after a recent sale) make it almost impossible to compete with places that were paid off a generation ago. When these restaurants and marinas close, townhomes and cabins usually replace them so I'm happy to pay the prices if it means another option when it comes to eating or grabbing some drinks on the lake.