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Old 01-21-2021, 06:20 PM
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Default 12 volt auto winch powered by 110 volt

I recently bought a 10,000# Warn winch that is going to be driving a boom crane I built for a roof top lift. I am wondering if any of you know what size transformer I need to run it off of 110 volt power. Standard auto batteries have tremendous "cranking amps" but is that actual amps? I see some step down transformers rated at 50 amps for around $300, is that enough to run the winch? Or is it just better to have a battery up on the roof with a solar trickle charger?
I will do a write up on the crane build in the fabrication forum soon. I am very happy with it.
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Old 01-21-2021, 06:41 PM
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50 amps won't get it look at the specs on this HF winch https://manuals.harborfreight.com/ma...3175345509.pdf it draws 96 amps with no load and spikes from there.
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Old 01-21-2021, 06:51 PM
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Shoot I was afraid of this. I guess Having a 12 v battery up on the roof with a solar charger is how it is going to have to work.
Thanks.
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Old 01-21-2021, 06:55 PM
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I run a 12k 12v warn winch on a 1000 CCA Tractor 12v Battery... Ive never measured draw. Id guess it peaks well over 100 amps.

Warn as well as others sells 120v winches for lifting, I think they call them hoists then.

Thinking a battery would be the easy solution, with a 10amp or larger charger on it while your using it to be re-charging while its resting.
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Old 01-21-2021, 11:23 PM
Lowe.Buuck Lowe.Buuck is offline
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An automotive winch is not a good choice for a couple of reasons.

First they are not rated for lifting (hoist) applications.

Second they have short duty cycles. So the lift distance better be fairly short. These motors heat up fast and you can quickly burn them up.

Warn's current literature does not state the Duty Cycle but does have a warning:

"Do NOT power out more than 30ft without allowing the winch to cool for 20 minutes before powering rope back in. Instead, place the clutch in freespool and pull the rope out by hand."

That is 30 feet unloaded just spinning the drum...

I had dual batteries in my truck to run my 8274. With 150 ft of cable on the drum, you can get the motor hot just respooling cable.

If you go with batteries, you may want to invest in a good battery charger with 200+ amp Start mode. But check the specs. The manual for mine tells you not to run it in Start mode for more than 10 minutes.

Still not rated for hoisting, but a chainsaw winch might be a better choice.
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Old 01-22-2021, 07:37 AM
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Quote:
Originally Posted by Barn Owl View Post
I recently bought a 10,000# Warn winch that is going to be driving a boom crane I built for a roof top lift. I am wondering if any of you know what size transformer I need to run it off of 110 volt power. Standard auto batteries have tremendous "cranking amps" but is that actual amps? I see some step down transformers rated at 50 amps for around $300, is that enough to run the winch? Or is it just better to have a battery up on the roof with a solar trickle charger?
I will do a write up on the crane build in the fabrication forum soon. I am very happy with it.
Quote:
Originally Posted by Lowe.Buuck View Post
An automotive winch is not a good choice for a couple of reasons.

First they are not rated for lifting (hoist) applications.

Second they have short duty cycles. So the lift distance better be fairly short. These motors heat up fast and you can quickly burn them up.

Warn's current literature does not state the Duty Cycle but does have a warning:

"Do NOT power out more than 30ft without allowing the winch to cool for 20 minutes before powering rope back in. Instead, place the clutch in freespool and pull the rope out by hand."

That is 30 feet unloaded just spinning the drum...

I had dual batteries in my truck to run my 8274. With 150 ft of cable on the drum, you can get the motor hot just respooling cable.

If you go with batteries, you may want to invest in a good battery charger with 200+ amp Start mode. But check the specs. The manual for mine tells you not to run it in Start mode for more than 10 minutes.

Still not rated for hoisting, but a chainsaw winch might be a better choice.
^^^Yup.

Get a electric hoist made for a crane. I picked up a used "David Round" cable winch, have not used it yet, but it was under $200.

Doo you have compressed air available ? 1/2-2 ton air powered hoists seem to go cheap around here, no duty cycle to worry about.

With your height problem, a drum is a problem, a chain hoist has the same pull throughout it's lift, as the chain comes back off the sprocket, and get's
dumped into a bag/can.
These electric ones doo have a duty cycle, but you may be just fine with your usage:
https://sandiego.craigslist.org/csd/...256248783.html
Extend the chain however far you need.

https://orangecounty.craigslist.org/...256089563.html

Last edited by digger doug; 01-22-2021 at 07:43 AM.
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  #7  
Old 01-22-2021, 11:21 AM
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A quick glance at those 10K Warn winches shows them to be about 5 or more HP motors. That's about 3,700 Watts - over 300A @ 12v. Probably a good bit more at at stall until they get cranking. Specs indicate maximum draw at around 400A for some.

We used to use Makita 12v cordless drill motors in our 125 lb. robots at the high school. Depending on gearing, we could blow a 60A breaker if we tried to take off really fast or on a steep slope. Those DC motors really suck current at stall.

Here's a small, high speed motor of about 1/2 HP. Check out the Amps at stall - 134!
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Old 01-22-2021, 01:02 PM
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I have a 850CCA battery powering a 17000lb winch on my trailer.
It seems to not tire out the battery that much dragging a dead car up onto the deck.
It can do it twice and then it's gasping.
This winch is very slow speed, and has the same motor as the 9000lb winch, which is geared twice as fast.
What do those AC units weigh, 300lb?
I would try it and see, you spent the coin anyway. All you can do is fry it.

FWIW, the winch is designed to release brakes in the cable power-in position only. If you are powering out in reverse you are doing so with the brake on, and they warn to free spool out and only use reverse for the final few feet. So pull out by hand in the freewheel position and lower the cable by hand.
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Old 01-22-2021, 03:07 PM
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Thanks guys for the input. There are two sizes of AC units, roughly 700 pounds and larger ones at 1000 pounds (96"x 60").

I have a winch in my garage lifting my work bench into my rafters so I can park my cars underneath. It is a 36 sq/ft bench that has my table saw, chop saw, router table, drawers for all of my wood working tools and lots of storage areas. It weighs in around 700 pounds and I use my 6000 pound Ramsey winch to move it. I cable out and in, stopping and starting throughout the lift for the last 20 years. We ran the crane up and down twice last night while unloading the smaller crane and it did fine, not overheating and not slowing.

I do get the free spool out recommendation and I will consider this if the current winch fails to do its job. The cycles on this crane are going to be minimal even while replacing the AC units, we will have to move one at a time and there may be hours between a lifts.

We also ran it using two large gel cell wheel chair batteries hooked up in parallel. When we were done we put the batteries back on the charger and it had barely used any juice off of them.
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"Yes, we did produce a near perfect Republic. But will they keep it? Or will they in their enjoyment of plenty, lose the memory of freedom? Material abundance without character is the surest way to destruction. Indeed, I tremble for my country when I reflect that God is just."

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If you spent 1 million dollars every day from the time Christ walked the earth until now, you still would not have spent 1 trillion dollars!
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Old 01-22-2021, 03:11 PM
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Quote:
Originally Posted by digger doug View Post
^^^Yup.

Get a electric hoist made for a crane. I picked up a used "David Round" cable winch, have not used it yet, but it was under $200.

Doo you have compressed air available ? 1/2-2 ton air powered hoists seem to go cheap around here, no duty cycle to worry about.

With your height problem, a drum is a problem, a chain hoist has the same pull throughout it's lift, as the chain comes back off the sprocket, and get's
dumped into a bag/can.
These electric ones doo have a duty cycle, but you may be just fine with your usage:
https://sandiego.craigslist.org/csd/...256248783.html
Extend the chain however far you need.

https://orangecounty.craigslist.org/...256089563.html
I do have a nice Ingersol Rand compressor, but I fear the 80 gallon tank would not be enough air in reserve to lift it effectively.
I like the bigger 1 ton hoist you found in my area, thanks.
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"Yes, we did produce a near perfect Republic. But will they keep it? Or will they in their enjoyment of plenty, lose the memory of freedom? Material abundance without character is the surest way to destruction. Indeed, I tremble for my country when I reflect that God is just."

Thomas Jefferson



If you spent 1 million dollars every day from the time Christ walked the earth until now, you still would not have spent 1 trillion dollars!
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