current draw on small 12v winch

Submitted: Friday, Mar 31, 2006 at 00:23
ThreadID: 32372 Views:9142 Replies:5 FollowUps:6
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i am fitting a 'supercheap' 12v winch on my trailer to pull the microlight up the ramps. the thing only weighs 180kg so thats no prob.
what i need the expected current draw of the winch, because if it is low enough, i will use it in the engel socket at the rear door. (this socket is wired direct to the aux batt with a 30a fuse and figure 8 cable, about 18 AWG).18 AWG is rated at 7A.
the winch is (and i quote from the box) a 0.45HP or 3Kw at peak.
the trusty formula P= I x V gives me 250 amps!
this would probably burn a long line in the floor carpet.
surely this can't be correct, or am i in for some re-wiring?
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Reply By: bombsquad - Friday, Mar 31, 2006 at 00:32

Friday, Mar 31, 2006 at 00:32
Possibly would burn a line in the carpet, and may spread. I have considered similar for one of my boats. I decided it was too much hasstle, as most of the time I can use the 90hp on the back to get it on. Maybe a $20.00 battery pack from supercheap with jump cables will do the job with little fuss - I use one to power camping lights and showers etc, it has lasted (to my surprise)18 months, although I have to charge it with a 4 amp charger rather than the 0.4 amp charger that comes with it!

Could be a simle solution for power with many other uses, mine had a handy little fluro built in until I broke it.

Cheers Andrew
AnswerID: 164007

Reply By: Member - Blue (VIC) - Friday, Mar 31, 2006 at 00:32

Friday, Mar 31, 2006 at 00:32
That'd be .3Kw... So would that bring you back to 25amps...???
AnswerID: 164008

Follow Up By: Member - Blue (VIC) - Friday, Mar 31, 2006 at 00:37

Friday, Mar 31, 2006 at 00:37
Or maybe it's 18amps... I struggle to understand these online conversion thingy's...
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Follow Up By: GaryInOz (Vic) - Friday, Mar 31, 2006 at 11:15

Friday, Mar 31, 2006 at 11:15
0.45 hp = 0.45 x 746 = 335 watts

Safety sake 360 watts -> 12 Volt x 30 amp. Not for a cigarette lighter/engel power plug
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FollowupID: 418889

Reply By: Redeye - Friday, Mar 31, 2006 at 03:35

Friday, Mar 31, 2006 at 03:35
Blue,

Correct the first time. 0.3Kw = 25 amps.

Howie

An Anderson socket with correct wiring at the rear of the vehicle would do the job. That is what I use with my Maxair compressor.

Redeye
AnswerID: 164015

Follow Up By: howie - Friday, Mar 31, 2006 at 09:21

Friday, Mar 31, 2006 at 09:21
inspected box in daylight and yes, there is a decimal point there, so its .3Kw
why not put 300w ?
anyway, think i will trot off to the 12v shop or something because 25A seems too much for my present wiring.
thanks guys
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FollowupID: 418860

Follow Up By: Member - Blue (VIC) - Friday, Mar 31, 2006 at 14:53

Friday, Mar 31, 2006 at 14:53
Redeye, I just shifted the decimal point on the watts and transposed that to the final outcome... Then I got the idea(boredom on night shift will do that) to look up an online converter... to convert watts to amps they wanted the "V" and the "Watts", press "Convert" and I got 18amps...??? I hate electronics
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FollowupID: 418925

Follow Up By: Redeye - Friday, Mar 31, 2006 at 16:09

Friday, Mar 31, 2006 at 16:09
Blue,

Current = power/volts
= 300/12
= 25 amps

The power conversion earlier on the thread by Garyinoz is also correct. That means there will be slightly more current.

Is it possible your converter was talking AC. and not DC power. RMS of 25 amps is approximately 17 amps (???) 25 x 0.707

Garry I
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FollowupID: 418963

Reply By: Tim HJ61 (WA) - Friday, Mar 31, 2006 at 05:51

Friday, Mar 31, 2006 at 05:51
Howie,

I'd be wondering if 18 gauge 7A wiring is adequate for the Engel, let alone a little winch. I'd be checking the voltage at the aux battery and at the Engel when it is running. Unless the cable run is quite short, I'd be expecting quite some voltage drop on load. I hate voltage drop and heat across plugs as it all equals wasted electrical energy.

I got some cool black and red cable to go with my Anderson Powerpoles which are rated at 30A and smaller and cheaper than the big grey ones. It's either 10 or 12 guage - or in auto sparky language I think he called it 5mm. I forget what the cross sectional area measurement was, but I'm a lot more confident about the capacity of the wiring now I've run that all over the place.

BTW, I put some left over Powerpoles on ebay Site Link if you want to see them. Great little plugs.

Tim
AnswerID: 164017

Follow Up By: Pajman Pete (SA) - Friday, Mar 31, 2006 at 06:17

Friday, Mar 31, 2006 at 06:17
Did you have any left you want to sell?

MM me if you have.

Thanks

Pete
Any mug can be uncomfortable out bush

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FollowupID: 418820

Reply By: Member - Glenn D (NSW) - Saturday, Apr 01, 2006 at 17:30

Saturday, Apr 01, 2006 at 17:30
I have a port-a-winch that has long heavy gauge leads with clips similar to jumper leads, It has an anderson plug onto the winch . You could easily make this without having a permanent installation in your vehicle.

Glenn.
AnswerID: 164287

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