Some stuff sourced for Ham radio operators seem to be quite good for this
purpose I think, but they are not cheap if well built with adequate cooling.
Most are switch mode these days which may well help with the problems of
dissipation greatly, though many have a minimum current as well as a max
one.

Brian

--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Bill Wright" wrote in message
news
On 05/04/2018 23:47, Dave Plowman (News) wrote:
The mains to 12v power supplied failed in a mate's motorhome, so although
he got it replaced I offered to look at it to see if it could be repaired
as a spare.

It is branded PowerPart, and is a 20 amp 13.8v device which charges the
leisure battery as well as running any 12v things when on mains. Cost
about 100 quid.

It was well and truly fried. Only heatsink for the power Mosfets was the
thin ally case - and a small cooling fan. Not that much for a device
likely mounted inside a cupboard of some sort.

Rectifier was short circuit and a transformer burnt with half the
laminations lying loose inside the case, so gave up.



Some of the rip-off merchants are asking £145 for it! The leisure market
is a right scam. Always buy from elsewhere if possible.

Bill