Can I power a 24V oven with a 19V laptop charger?

Cornucopia

As a general rule, and there can be exceptions, something like a laptop charger would be well-engineered with delicate components and should really only be used to power computer equipment, or something with similarly refined power requirements.

An oven is not such a device, and I would recommend not attempting this, even if the ratings are superficially similar.

George_Michael

Look at it this way.
Generic laptop chargers (and similar power supplies) can be bought for only a few £s, so if this sort of charger would be suitable for that oven, I think that the manufacturer would be selling it as an optional extra.
A oven that can easily be used in a location with a mains supply as well as in a truck/caravan/boat would surely be more popular that one that had limited places it could be used.

Cornucopia

Maybe.

The manufacturer can market his 24v oven worldwide with just a simple change to the lettering on the box between different countries.

Add a mains power supply to that and it brings in all sorts of issues from the style of the mains plug, to standards for insulation, to differences in mains voltages.

jeallen01

A low supply voltage may well cause the control circuits not to work correctly, or not at all - and I seriously doubt that a 19V laptop adapter could conceivably power a microwave oven:D

enfield_freddy

is it a microwave oven?




I must have missed that

jeallen01

enfield_freddy wrote: »

is it a microwave oven?

I must have missed that

Doesn't matter if it is a microwave or conventional oven, because the power consumption requirements are pretty similar - and it's a LOT more than a laptop PC by, at least, a factor of 10!

enfield_freddy

umm , it does make a difference if it is a microwave.


a microwave is rated on output power , not power used in making it , a filament rated at 100w , uses exactly 100w.




http://www.sust-it.net/microwave-ovens.php




and on a microwave


energy input is generally 30%-50% more than output

jeallen01

enfield_freddy wrote: »

umm , it does make a difference if it is a microwave.


a microwave is rated on output power , not power used in making it , a filament rated at 100w , uses exactly 100w.

I would suggest that "you don't get owt for nowt" - in other words, you need a LOT of power IN to get a LOT of power OUT.



And, since the internal circuitry of the oven will consume at least a small additional amount of power (and, agreed, a conventional oven might well be less complex and thus use less power than a microwave oven), then any oven will consume MORE power from the AC Mains supply than it will deliver to the food being cooked - unless, of course, you have discovered a device that provides more power to the "load" than it actually consumes from the supply.


PS: the best modern Switched Mode Power Supply (SMPU) has a maximum efficiency of around 90%, but that means that it STILL consumes more than it supplies.


Nevertheless, IF you really believe the myth that you can get more power out than you put in, then, PLEASE, immediately put yourself for a NOBEL Prize because you will be the saviour of the modern world


And, PS, I think that the output rating of a microwave oven is something like "effective power delivered" within the food - being the heating effect caused by microwave radiation - rather than the convected /radiated power delivered by a conventional oven, and so the "output ratings of the two types are not strictly comparable

enfield_freddy

Nevertheless, IF you really believe the myth that you can get more power out than you put in, then, PLEASE, immediately put yourself for a NOBEL Prize because you will be the saviour of the modern world

I said
energy input is generally 30%-50% more than output on a microwave


so , are you saying that a 100w convection oven uses the same power as a 100w microwave oven ?


I actually posted a link saying there was a "vast" difference.


hence my previous post , "yes it does make a difference if its a microwave oven" to which you disagreed.




PS , I agree , a laptop PSU is not the correct device to power this