12V step to 24V - possible?

ianc1200

ianc1200

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Have bought some second hand davits, and intend to use manually. But they came with with electric motors, but have noticed now the solenoids are 24V. Is it possible to somehow have a transformer and step the voltage up to 24V? (my boat is all 12V)
 
Plenty of 12 to 24v converters. Search for ‘boost converter’ - but one that will deliver the sort of amps you’re after to winch a flubber up will be harder to find and/or not cheap I reckon. What ampage are your 24v motors? It should be written on them somewhere.
 
Try on 12v first. The solenoid and motor may work OK if a bit slow. Current drain (so power) is not proportional to voltage like other devices. (motor slow current higher)
From OP wording it might be that solenoids only are 24v . that would be asy to boost 12v for the small current. As said if it is the motor you need 24v for then that can be difficult. An additional battery with attendant switching for 12v charging 24v using might be an answer. ol'will
 
I think your original idea is better - Route the lifting rope to the mainsheet winch and get some exercise?

Save the electricity for the devices and hair dryer.

Jonathan
 
Can you have two 12 volt batteries in series dedicated to your davits? That would give you 24v.

Perhaps they could be switched into parellel for charging, and back to series for lifting?
 
It all comes down to watts .... motors will run on 12v even if 24v ... but if the weight being lifted is more than 12v to motors can deliver ... then its a hand job ! Of course hopefully the solenoids action on 12v ... which if true 24v .. may not.

I'd take a charged 12v battery and jump lead it to the davits and see what happens ..
 
PaulRainbow said:
Highly unlikely that the solenoids are 24V and the motors are 12V. As Fred said, see if you can see something on the motors.
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I would be extremely surprised if any of the 24 volt stuff would work on 12 V. I think dedicated batteries in series may be the answer. with a suitable charging arrangement. They probably don't have to be very big. Cannot say more without ratings of the kit.
 
Alex_Blackwood said:
I would be extremely surprised if any of the 24 volt stuff would work on 12 V. I think dedicated batteries in series may be the answer. with a suitable charging arrangement. They probably don't have to be very big. Cannot say more without ratings of the kit.
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I have 2 24Vdc sheet winches that I drive from 2 12VDC batteries in series charges by 2 separate solar cells.

If the solenoid (relays or 12Vdc then could be changes to 12 even if driving, then motors that could either be 12Vdc or 24 Vdc.

My sheet winches are controlled with 12 vdc relays driving the 24vdc reversing motors
 
rogerthebodger said:
I have 2 24Vdc sheet winches that I drive from 2 12VDC batteries in series charges by 2 separate solar cells.

If the solenoid (relays or 12Vdc then could be changes to 12 even if driving, then motors that could either be 12Vdc or 24 Vdc.

My sheet winches are controlled with 12 vdc relays driving the 24vdc reversing motors
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Seems a bit convoluted to me, considering, in the OP's case he has a 24 volt system, use 24v throughout, never mind faffing around altering bits to 12 volt and some at 24. asking for trouble IMHO:unsure: :ROFLMAO:
 
ianc1200 said:
Have bought some second hand davits, and intend to use manually. But they came with with electric motors, but have noticed now the solenoids are 24V. Is it possible to somehow have a transformer and step the voltage up to 24V? (my boat is all 12V)
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Alex_Blackwood said:
Seems a bit convoluted to me, considering, in the OP's case he has a 24 volt system, use 24v throughout, never mind faffing around altering bits to 12 volt and some at 24. asking for trouble IMHO:unsure: :ROFLMAO:
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The OP says his boat is 12V as is mine in my case having 24V motors I would need a high current DC-DC just for one item so I simply added a second 12 Vdc battery where the first 12V battery powered the 12Vdc boat and the extra battery in series to provide te extra 12 Vdc needed for the winch motors.

I then needed some way to charge the extra 12 Vdc so I simply connected a separate 12 v solar panel to the first 12 Vdc battery and a second independent solar 12Vdc panel to charge the extra battery
 
rogerthebodger said:
The OP says his boat is 12V as is mine in my case having 24V motors I would need a high current DC-DC just for one item so I simply added a second 12 Vdc battery where the first 12V battery powered the 12Vdc boat and the extra battery in series to provide te extra 12 Vdc needed for the winch motors.

I then needed some way to charge the extra 12 Vdc so I simply connected a separate 12 v solar panel to the first 12 Vdc battery and a second independent solar 12Vdc panel to charge the extra battery
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I get that Roger, I was referring to mucking around changing 24 V relays for 12 V etc. and having two different voltages in the same system.
 
Alex_Blackwood said:
I get that Roger, I was referring to mucking around changing 24 V relays for 12 V etc. and having two different voltages in the same system.
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Well It would depend on the voltage of the motor. I was referring to the relay coil voltage could be 12 Vdc in my case I do not have the relays as its easier to get SPCO relays with 12 V coils although I have found SPCO with a 24 v coli but more expensive than 12V coil

As as the rest of the boat is 12V there needs to be some
MontyMariner said:
My boat had both 12 & 24v systems, I eventually got fed up with having two alternator's, series batteries etc., so replaced them with a 12 to 24v converter DC Converter 12V to 24V 20A 480W Step-Up Boost Power Supply Module Car Silver UK | eBay I wish that I had done it years ago.
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Mt 24 Vdc motors draw 40 to 50 Amps so that 12 - 24 converter would no provide the required current for one winch let alone 2
 
First you need to find out what current is required by the motors. If they are very low geared the motors might be quite small and Monty Mariner's solution could work. The current or wattage might be marked on the motors. When you have a bit more information the correct solution will be obvious. Cordless drill technology has greatly improved the power and efficiency of small motors.
Most multimeters only read up to 10A so you will need a DC clamp meter or a shunt resistor to calculate the current. The motor starting current will be several times higher than the running current and some electronics will fold back the output and not enable the motor to start.
 
rogerthebodger said:
Well It would depend on the voltage of the motor. I was referring to the relay coil voltage could be 12 Vdc in my case I do not have the relays as its easier to get SPCO relays with 12 V coils although I have found SPCO with a 24 v coli but more expensive than 12V coil

As as the rest of the boat is 12V there needs to be some


Mt 24 Vdc motors draw 40 to 50 Amps so that 12 - 24 converter would no provide the required current for one winch let alone 2
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Don't forget, the OP only has motors for davits Roger, could well be more than those converters can handle, but doubt they'll be 40-50A @24V
 
andsarkit said:
First you need to find out what current is required by the motors. If they are very low geared the motors might be quite small and Monty Mariner's solution could work. The current or wattage might be marked on the motors. When you have a bit more information the correct solution will be obvious. Cordless drill technology has greatly improved the power and efficiency of small motors.
Most multimeters only read up to 10A so you will need a DC clamp meter or a shunt resistor to calculate the current. The motor starting current will be several times higher than the running current and some electronics will fold back the output and not enable the motor to start.
Click to expand...

What has vastly improved the e-motor situation - is the introduction of Brushless Motors and Coreless to the retail market. For years they were the domain of Commercial only ...
 
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