I think you will be greatly disappointed trying to run that winch with a 20
amp supply. If you insist on trying, consider that it is better to
experiment by trying to lift the tower than to lower it. If the winch were
used to lower the load via its "power out" capability you might get the
tower down and then find you can't raise it back up. Those winches are
notorious current hogs and as you may have noted by the duty cycle specs,
are rated at the edge of or past the envelope. I hope you are successful
and safe in your efforts. If it works just fine lifting the tower on a 20
amp supply with no other assistance then I owe you a Root Beer float the
next time we are together.
The brush type DC motor in that puppy doesn't care about good filtering or
precise voltage control. If you can come by a good used xformer that will
put out 12 to 18 volts at 50 amps then slap on a full wave diode bridge
rated for maybe e about 100 amps (put it on a heat sink) and you are ready
to go. Alternatively find a 24 to 30 volt xformer with a center tap and put
on a two diode bridge with cooling for the bridge and go for it. A slow
blow fuse or thermal breaker rated at or above the max current in normal use
would be a good idea too. Another possibility is a heavy duty battery
charger, typically on wheels and will have a start position that sources
serious amps, well above the normal charge rates. These are duty cycle
limited so choose wisely "grasshopper" and consider adding a fan to lengthen
the duty cycle. I have seen working used units go for under $50. Check the
specs on the Harbor Freight u nit. It might just make the cut. Consider
you will have a terrific battery charger/jump starter as well as a winch
power supply.
73 and best of luck,
Patrick NJ5G
-----Original Message-----
From: Mike Reublin NF4L
Sent: Monday, February 03, 2014 6:46 AM
To: towertalk reflector
Subject: [TowerTalk] HF winch
I picked up a 2500 lb. rated 12V. winch from Harbor Freight intending to use
it for tilting my HG-70HD tower. Weight with antennae and rotor etc. is
between 1200 and 1300 lbs. I was hoping to run it from a 20A power supply.
I plan on a pulley arrangement that will give me a 2:1 advantage. I could go
to 3:1.
If I read the specs right, the winch draws 55 amps when the load is 1000
lbs. The duty cycle is 45 seconds on, 14 MINUTES off. Mounting is 2 bolts,
M8-1.25x35 mm.
Seems a tad sketchy. Your opinion?
73, Mike NF4L
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