Teardrops n Tiny Travel Trailers

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
Al

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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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.

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

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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

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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https://en.wikipedia.org/wiki/Buck_converter
A buck converter (step-down converter) is a DC-to-DC power converter which steps down voltage (while stepping up current) from its input (supply) to its output (load).

Used to be able to get these for a couple dollars.. Things have changed, but they are much better also.
https://www.amazon.com/dp/B07CVBG8CT/ref=sspa_dk_detail_0?psc=1&pd_rd_i=B07CVBG8CT&pd_rd_w=A15IV&pf_rd_p=7d37a48b-2b1a-4373-8c1a-bdcc5da66be9&pd_rd_wg=moxy0&pf_rd_r=36F5PV6S1EWRWNY1T859&pd_rd_r=459e3213-8a34-4aab-91d0-c220c492e84a&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExWkdBSERXVTROQlMmZW5jcnlwdGVkSWQ9QTAyMzg1NTMyV0pQQldSOEc3MUpKJmVuY3J5cHRlZEFkSWQ9QTAwNDMxNTUzWjFZQ0tKMU0wVFYmd2lkZ2V0TmFtZT1zcF9kZXRhaWwmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl

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.

this might be just what I need

https://www.ebay.ca/i/163483190358?chn= ... TwQAvD_BwE

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

"can heat the coat" does not inspire confidence