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

    • BartmanMN

      Posted

      Where are all the Duck reports from the almighty Pelican? 

      Did all this rain fill the lake back up?  I haven't driven by at all. 

      I bet the crappies and gills are growing nicely.   Soon enough.

    • Big Kype

      Posted

      Yep it is the 3 S's - I just don't think a lot of people are going to be grouse hunting with a shovel - but not a bad idea.

    • BringAnExtension

      Posted

      Thank you gentlemen.  I knew I'd get a quick answer!

    • NorthwoodKing

      Posted

      St. Croix Avid 6’6” Med - spinning $75

      St. Croix Premier 6’ Med – spinning $75

      St. Croix Premier 7’ Med – spinning $75

      St. Croix Premier 6’ Med lite Fast – spinning $75

      St. Croix Premier glass/graphite Moderate – trolling $75

      Fenwick Eagle 6’6” Med Fast – spinning $75

       

      Pflueger President Spinning reel  #6730 $60

      Pflueger President Spinning reel  #6730 $60

      Pflueger President Spinning reel  #6925 $70

      Daiwa Sealine SG17LC3B $75

       

    • leech~~

      Posted

      17 hours ago, phillyfacks said:

      We've got a cabin up on Pelican and I've definitely noticed less cormorants on the lake this summer.  The state did grant the owner of Gooseberry Island a permit to kill cormorants, which was done this Spring.  I talked to a DNR officer on the lake this summer and he said they had shot almost 400 birds, I don't recall the exact numbers but it was somewhere between 350-400. 

      Thanks for the Update, I think that I did see less birds out on Edwards as well later this summer. Hopefully they shoot 400 more next spring! :)

    • NorthwoodKing

      Posted

      Abu Garcia Revo Toro 60 5.4:1 $175

      Shimano Calcutta 400TE $250

      Shimano Curado 300EJ $200

      Shimano Tekota 500LC $150

      Daiwa Lexa 300 HS-P $200

       

      St. Croix Mojo Musky 8’ Med-Heavy Split grip $100

      St.Croix Premier  8’6” Heavy $125

      St.Croix Premier  8’ Heavy - glass/graphite $125

      Thorne Bros. C Series Custom 8’6” Heavy $175

      Fenwick Elite Tech 7”6” Heavy - jerkbait/twitchbait $125

       

    • NorthwoodKing

      Posted

      2011 Alumacraft 165 CS Classic w/2011 70 h.p. Yamaha, 2011 Shorelander trailer for sale. Humminbird 859ci HD Sonar/GPS, Minnkota 55 lb. Power Drive V2, Jensen AM/FM Cassette player. Low hours, pristine condition $14,000

      00q0q_lTDJEMgVXZS_600x450.jpg

      00w0w_bROm6jzb6Er_600x450.jpg

      00y0y_hMo6LDkWIvS_600x450.jpg

      01515_kQV2JIXWJ3y_600x450.jpg

    • Dinner

      1 person likes this
    • 13 hours ago, Big Kype said:

      Northern Minnesotans are strong supports of the SS rule. Shoot and shut up.

      I thought it waqs 3 s         shoot shovel and shut up  :shhhh:

    • eyeguy 54

      Posted

      probably eagles if fishing. I think the fultures like highways. :):) 



  • Posts

    • BartmanMN
      Where are all the Duck reports from the almighty Pelican?  Did all this rain fill the lake back up?  I haven't driven by at all.  I bet the crappies and gills are growing nicely.   Soon enough.
    • Big Kype
      Yep it is the 3 S's - I just don't think a lot of people are going to be grouse hunting with a shovel - but not a bad idea.
    • BringAnExtension
      Thank you gentlemen.  I knew I'd get a quick answer!
    • NorthwoodKing
      St. Croix Avid 6’6” Med - spinning $75 St. Croix Premier 6’ Med – spinning $75 St. Croix Premier 7’ Med – spinning $75 St. Croix Premier 6’ Med lite Fast – spinning $75 St. Croix Premier glass/graphite Moderate – trolling $75 Fenwick Eagle 6’6” Med Fast – spinning $75   Pflueger President Spinning reel  #6730 $60 Pflueger President Spinning reel  #6730 $60 Pflueger President Spinning reel  #6925 $70 Daiwa Sealine SG17LC3B $75  
    • leech~~
      Thanks for the Update, I think that I did see less birds out on Edwards as well later this summer. Hopefully they shoot 400 more next spring!