Lots of Karma to whoever finds...

[The Artist]

a DC-DC converter. 6V-50V input and 12V output. Must be able to handle 4 amps at 12V.

All I can find are 8V-40V input or similar. Ideally automotive style, so waterproof with the standard die cast aluminium housing.

[duhawkz]

Have you tried farnell?

https://uk.farnell.com/jsp/search/browse.jsp;jsessionid=BY0TAXM535I2ACQLCIPJK0Q?N=0&Ntk=gensearch&Ntt=dc+converter&Ntx=mode+matchallpartial&exposeLevel2Refinement=true&suggestions=false&ref=globalsearch&_requestid=352816
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[The Artist]

[orac]

that a very wide voltage range for input (and odd voltages too). you may end up building something for that.

whats is it application to be?
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[The Artist]

[karoshi]

Can't find anything that would do 4a at 12v out from that low an input voltage, Murata do a couple of brick type converters that might do the output but they're starting from ~18v minimum input:

input range of 18v - 36v / nominal:24v on this:
https://www.murata-ps.com/en/products/dc-dc-converters/single-output-isolated/ule-12-4-2-d24n-c.html

input range of 18v - 75v / nominal:48v on this:
https://www.murata-ps.com/en/products/dc-dc-converters/single-output-isolated/uws-12-4-5-q48nm-c.html
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Well, I've wrestled with reality for 35 years, Doctor, and I'm happy to state I finally won out over it. - Elwood P. Dowd

[karoshi]

Maybe worth calling these guys: https://www.relec.co.uk/WDD20-A ?

Their WDD20-12S4U model lists 9v - 36v in, 12v out but I don't know what loading it'd carry?

[edit] 1.6A load by the looks of it
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Well, I've wrestled with reality for 35 years, Doctor, and I'm happy to state I finally won out over it. - Elwood P. Dowd

[The Artist]

Yeah it looks to be a tricky one to find.

[ScaredyCat]

[The Artist]

^^ Unfortunately that is quite expensive. If it went to 48v then I would consider it.

I am thinking of going for just this.
https://www.amazon.co.uk/gp/product/B00GXXQ1VA/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1

Cheap and can handle upto 40v. Only issue is it just a step down unit so anything below 12v, the output is also below 12v.
£10.50 for 12v-24v is decent value compared to anything else I can find.

[G]

Could you do something with a solar charge controller?

Have to play about a bit probably as they're intended to charge batteries, but they can often do 100v to 12v (well, a voltage appropriate for charging a 12v battery) with plenty enough amps.

An MPPT one won't lose too many watts in the processes.

[janner_10]

Easier to plan for the primary side as most are going to be 110 to 230v ac, pretty much every machine in the world is going to have this to tap into.

Then just carry around your own tranny with a 12v output - with 4A output its not going to be much bigger than a fag pack.

Like: https://uk.rs-online.com/web/p/din-rail-panel-mount-power-supplies/0428467/
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[oldpink]

been a while since I built any thing like that (30 years ago)
but its not hard
biggest problem is dissipating the unwanted energy
or drawing enough current from a lower voltage than the outpit
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[The Artist]

[The Artist]

[G]

A 10A PWM would be under a tenner - but they dump excess load.
May not be an issue for you.
A quick look shows a MPPT that CLAIMS to do 48v and up to 30A for 12v for around £30.
For a solar application these are probably not up to scratch - I expect you'll have issues if you sustain 30A charging 12v batteries, but may well be fine for 4A and less.
There are cheaper options from £6, but the first one I looked at didn't go up to 48v for 12v systems.

Of course, none of these will do 6v.

Another option I'd thought about, but that cost more is 'hobby chargers' used for electric RC vehicles - these are often designed to work from batteries in the field. But, ones that take up to the sort of voltage you're looking to go up to tend to be expensive with decent outputs - ie going past 1kw.

[Aff]

[The Artist]

This is for a power tool using a DC battery supply. Looking at MPPT's, I don't really gain much for the cost increase.

I will keep them in mind if I need a higher current rating though.

[Charlie]

Why is the input range so large? What are the actual input voltages going to be?
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[The Artist]

[G]

Any reason not to just get some seperate batteries?

If it's only drawing a maximum 4A, a set of lithium batteries that should run it for a good amount of time shouldn't be too expensive or heavy.

[The Artist]

[G]

Not saying it'll be any good and probably be half the listed amp-hours, but...
www.ebay.co.uk/itm/290926383451

Not expensive.

[The Artist]

[G]

If it's half that 'usable', I reckon you'd be lucky. But, of course, that'd give you over 50 minutes or so use at 4A, which isn't too bad.
There's a similar claimed 8000mah one up for around £20.