20 volt dewalt batteries 12 volt appliances

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20 volt dewalt batteries 12 volt appliances

Postby yycwrangler » Thu Dec 31, 2020 4:06 pm

does anyone know if I can use my 20 volt DeWalt batteries to power 12 volt appliances in my trailer. Mostly looking at led lights and low voltage things. I see an adapter than can be purchased but all it is, is a unit that you connect your 20 volt batteries to and have 2 wires running out of it. (see below). What about using an invertor

https://www.etsy.com/ca/listing/7525603 ... MgQAvD_BwE

cheers
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Re: 20 volt dewalt batteries 12 volt appliances

Postby flboy » Thu Dec 31, 2020 5:35 pm

20V will most likely cause damage to most 12V devices. If not outright damaging the device, it may significantly reduce the lifespan..

I would not advise it.

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Re: 20 volt dewalt batteries 12 volt appliances

Postby NevadaBlue » Thu Dec 31, 2020 5:52 pm

Many “12 volt” things will run on up to 15 volts because they ‘plug in’ to a vehicle and the alternator can sometimes produce more than 13 or 14 volts. The battery is there to provide a cushion in that case.

I am trying to figure out if I can run my Ryobi fan on 12 volts. The fan will run on a Ryobi 18 volt tool battery OR direct 110 volt plug in. I think I will make a jumper and see if it will operate on 12 volts safely.
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Re: 20 volt dewalt batteries 12 volt appliances

Postby flboy » Thu Dec 31, 2020 6:29 pm

I'd think and 18vdc fan would run on 12vdc, just a little slower.

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Re: 20 volt dewalt batteries 12 volt appliances

Postby John61CT » Thu Dec 31, 2020 6:32 pm

DC-DC "Buck" converter is what you need, from the higher V down to ~13V.

Make sure sized to handle 29+% more amps current than you will ever draw through it, a fuse will help with that.

Cheap ones usually don't have good OCP
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Re: 20 volt dewalt batteries 12 volt appliances

Postby flboy » Thu Dec 31, 2020 6:38 pm

I'd just buy the 12vdc battery if you need the DC to DC converter. It is a drill battery with probably only 3 to 4 aH of capacity. Not much to work with and the converter will waste about 15% off the top.

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Re: 20 volt dewalt batteries 12 volt appliances

Postby RJ Howell » Fri Jan 01, 2021 7:54 am

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Re: 20 volt dewalt batteries 12 volt appliances

Postby RJ Howell » Fri Jan 01, 2021 7:59 am

I used to get these batteries for free (so called dead) and harvest the cells. From that would build up my battery bank according the volt/ah I wanted. It was a great source for lithium 18650 batteries, especially FREE!!! Now folks are buying those batteries..

If these are just a couple you have around, go with the buck converter. If you getting a cheap supply, harvest and build to suit your requirement.
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Re: 20 volt dewalt batteries 12 volt appliances

Postby yycwrangler » Fri Jan 01, 2021 1:15 pm

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Re: 20 volt dewalt batteries 12 volt appliances

Postby John61CT » Fri Jan 01, 2021 7:32 pm

Find out the max amps of the "12V" output

"can heat the coat" does not inspire confidence
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