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  1. #1
    Bronze Member
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    Dunvegan, Ontario, Canada

    Default Electric Question?

    Hi......My alternator is 12 volt 20 amp. If I draw (300 watts).....which is more than my alternator generates can I damage my alternator or just dicharge my battery?
    Thanks......Casey

  2. #2
    Super Member
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    Deere 110tlb, 4520, x749, L130

    Default Re: Electric Question?

    Quote Originally Posted by caseyvand View Post
    Hi......My alternator is 12 volt 20 amp. If I draw (300 watts).....which is more than my alternator generates can I damage my alternator or just dicharge my battery?
    Thanks......Casey

    It would depend on the duration cycle and off/on time. A starter draws alot of power but only for a short period of time as an example. You really haven't supplied much information needed to get good advice.

  3. #3
    Elite Member
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    Aug 2004
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    3,280
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    North of Mtl,Que,Can (Ste Adele)
    Tractor
    MT180D

    Default Re: Electric Question?

    For sure discharge the battery but the alternator runs a high risk of damage as well as it will always be maxed out.

    Ideal power management is about 80% of rated output.

    Do don't say what machine this is on nor reason for higher requirement.

    Some options could be to use LED lighting rather than incandescent bulbs, also halogens draw a lot as well.

  4. #4
    Super Member
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    Deere 110tlb, 4520, x749, L130

    Default Re: Electric Question?

    Quote Originally Posted by PILOON View Post
    For sure discharge the battery but the alternator runs a high risk of damage as well as it will always be maxed out.

    Ideal power management is about 80% of rated output.

    Do don't say what machine this is on nor reason for higher requirement.

    Some options could be to use LED lighting rather than incandescent bulbs, also halogens draw a lot as well.

    This is a perfect example of what I referred to, it is impossible to offer much advice if we don't have enough particulars.

  5. #5
    Bronze Member
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    Dunvegan, Ontario, Canada

    Default Re: Electric Question?

    Hi...OK I see what you mean as far as info goes......What I'm trying to do is run an electric 12 volt 300 watt heater in the cab of my JD 455. I just need enough heat to keep the windshield warm so the snow does not stick on it. With the information that you have provided it is probably better to work with a seperate battery. I do know that there are heaters that are plumbed into the cooling system but I was trying to avoid that because of the way the front windshield has to swing up to open the hood. I generally do not blow snow for more than 45 min.
    Thanks.....Casey

  6. #6
    Super Member
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    Deere 110tlb, 4520, x749, L130

    Default Re: Electric Question?

    My X749 has a 40 amp alternator on it, was wondering if this would fit a 455? Might be an alternative to another battery.

  7. #7
    Veteran Member K7LN's Avatar
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    Feb 2009
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    1,545
    Location
    Michigan
    Tractor
    JD455 & JD790

    Default Re: Electric Question?

    Quote Originally Posted by caseyvand View Post
    My alternator is 12 volt 20 amp. If I draw (300 watts).....which is more than my alternator generates can I damage my alternator or just dicharge my battery?
    I'd be a little more concerned with the voltage regulator, or should I say, add that to the problem pile?

    Quote Originally Posted by jenkinsph View Post
    My X749 has a 40 amp alternator on it, was wondering if this would fit a 455? Might be an alternative to another battery.
    Worth looking into, but you will probably need another VR along with some changes in wiring. I don't think there's enough room to add something like one of the automotive Delco units.
    JD 790 w/70 FEL & 7 BH on turf tires
    JD 455 w/60" MMM & 54" front blade

  8. #8
    Super Member
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    Feb 2008
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    Deere 110tlb, 4520, x749, L130

    Default Re: Electric Question?

    I am curious if this 300 w heater is going to provide enough heat anyway. This is only about 1020 btu's output. I did some research over the weekend and found a small fan coil type heater that could mount in the cab for about $200. Much more heat available with the water and coil unit.

    About the alternator, it seems most of the new models hook directly to the battery without an external voltage regulator. Haven't looked at my mower to know this as fact though.

  9. #9
    Super Member mjncad's Avatar
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    A couple

    Default Re: Electric Question?

    With a 455 I'd use a water heater instead of an electric one.
    Paraphrasing Douglas Adams - So long and thanks for all the bacon.

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