Off Bike Power for Heated Jacket

Discussion in 'Equipment' started by learnin4life, Dec 7, 2019.

  1. learnin4life

    learnin4life Adventurer

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    I want to use my Warm & Safe heated jacket off the bike to keep warm while stargazing near my home. Just wanted to ask whether anyone has successfully powered their heated gear directly from a battery tender.

    The daisy chain would be AC power outlet—extension cord—Battery Tender—24’ SAE to SAE cord—SAE to Coax Female adapter—Heat Controller Unit—Heated Jacket. This path eliminates the battery which is typically how power gets to heated gear while riding.

    Will this setup fry the controller, the jacket, or me?
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  2. dtaylor

    dtaylor Eaten by a grue.

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    I used a regular 10 amp battery charger to test bench Tourmaster Synergy heated gear, and it fried the controller within a few minutes.

    A battery tender may or may not be kinder to your heated gear controller, and even if it's providing clean enough power, it may not have enough amperage to heat a ~90 watt jacket on full power.

    I'd be inclined to repurpose a 12 volt power tool battery or a UPS battery (which you can charge with your battery tender):

    https://www.batteryspecialist.ca/es7-12-mk-replacement-battery-12v-7-2ah-ub1272/
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  3. learnin4life

    learnin4life Adventurer

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    You identified one of my major concerns. That is, how would the controller hold up to a different power source.

    Probably makes sense to keep a traditional battery as part of the process. Let the jacket draw power from the battery, and let the battery tender simultaneously recharge the battery. I was hoping to eliminate the big lead anchor from the process.

    Thanks for the feedback!
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  4. KPK

    KPK Been here awhile

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    Look at Shorai batteries. A bit pricey but a scooter battery is 12volt and they can be found at around 2.5 inches thick 4.5 inches wide 3.5 inches tall and weight just 1 pound.
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  5. JensEskildsen

    JensEskildsen Long timer

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    And holds very little usefull amps...

    I used a 12v 3amp nimh battery for an old RC car a couple times for a homemade heated shirt/jacket.
    But any battery short of a car battery wont run a 90w heated jacket for long.

    To the OP: if you have power for a batterytender, to keep a battery charged, that keeps your jacket warm... You should be able to finde something that will plug in to a socket, that will step down the voltage to around the 12v you need, like fx a computer power supply.
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  6. jfauerba

    jfauerba Been here awhile

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    Jump off battery may work since it may be able to give off enough volts and amps. I use one to power a 12v winch many times. 12v air compressor a few times. Used 3 different types, the old lead acid big heavy version and two of the new portable light weight ones that can fit you your coat pocket.
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  7. learnin4life

    learnin4life Adventurer

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    Interesting idea. I'm not that familiar with cobbling together DC power supplies, such as a computer brick. I'm guessing that I would need to match the output to the load, say 90 watts continuous, for the concept to work. Any suggestions on where to get that info or what specifically to look for?
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  8. learnin4life

    learnin4life Adventurer

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    I'm not familiar with a jump off battery, but a light weight battery that could fit in my pocket sounds expensive. Do you think such a battery would be suitable for the continuous load of a heated jacket?
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  9. WindBlast

    WindBlast Sonorous and Effulgent

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  10. Tall Man

    Tall Man Come and take it.

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  11. JensEskildsen

    JensEskildsen Long timer

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    The power supply does exactly the same thing as you bike does when the jacket is connected to that. The output of the powersupply just needs to exceed the demand, just like your bikes charging system needs to exceed the demand from the jacket, or your bike will run flat.

    Think of it like turning on a a lamp at home. The powersupply (your wall socket) will run many lamps at a time, but it wont hurt anything to just turn on one lamp.

    It cant "pump in" more juice than your jacket (or lmap as above) will draw.
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  12. dravnx

    dravnx Been here awhile

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    Even a modest 1000ah Jump Box will run your jacket at full power for a couple of days. Run it at 1/2 power and you can be warm for a week. A 1000ah battery will supply 7 amps (90 W @12 VDC) for 142 hours.
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  13. JensEskildsen

    JensEskildsen Long timer

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    Link? If its the ones I think about, they can supply up to 1000A of starting current, but is nowhere near 1000Ah, or even 100Ah in capacity
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  14. Yinzer Moto

    Yinzer Moto Long timer Supporter

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    I am going to second this suggestion. It is a system that is built already and works.
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  15. worwig

    worwig Long timer

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    NO!

    You might find a 1000 amp peak current jump box. But there is no 1000 amp hour jump box. Most are rated in MILLIamp hours. And many are rated at the CELL voltage, not the battery pack voltage. So if you get say a 20,000mahr pack (somewhat large BTW), that is at 3.7 or so voltages. Or 74 watt hours. Or one hour for a 74 watt vest. Two or three hours turned down.

    BTW, a 100ah, 12V, lithium battery, is huge and can cost close to $1000.
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  16. AdvNener

    AdvNener Long timer

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    Well I suppose a 1000A.h battery would be 100xtime bigger and heavier than the average 10 000 mA.h "battery pack". They are about 200g. So only about 20kg ! (actually maybe more like 40-50kg because those external 10000mA.h batteries are @5V)
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  17. lipsee

    lipsee Been here awhile

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    As a electric jacket backup I have my Noco GB70,,, its big assed for a starter battery ,but it has a line output to allow devices like heated gear to be connected up ... its not light ,but in an emergency you could put in in a rucksack and you,er away.... Of course there are better options,,, but I like gear that will do more then one trick....
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  18. Shawnee Bill

    Shawnee Bill Long timer Supporter

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    Google 12 volt power supply, lots of them out there.

    Good read here for what you are looking for. Linky

    I have one I bought years ago when I was looking to make an RV out of a van, bought it from a place that serviced and parted out old RVs, sort of an RV junkyard. Plugs into 110 wall socket and puts out enough power for sever jackets I suppose.
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