Inverter troubles

I have a 12VDC - 240VAC pure sinewave inverter and I want to stop the
cooling fan from operating when there is no load. The minimum load is
7W and max load 30W.

 

[Luhan Monat]

david.haine@tenix.com wrote:

I have a 12VDC - 240VAC pure sinewave inverter and I want to stop the
cooling fan from operating when there is no load. The minimum load is
7W and max load 30W.

By a cheap thermostat from Home Depot. Mount it inside the unit and
connect it to the fan.

--
Luhan Monat (luhanis 'at' yahoo 'dot' com)
"The future is not what it used to be..."
http://members.cox.net/berniekm

 

[aslaveofaudio@gmail.com]

why a thermostat? wouldn't u need to measure the load not the
temperature? so buy a device that will meausure the watts and then when
it gets above 8 or 9 watts activate the fan

 

[Terry Given]

aslaveofaudio@gmail.com wrote:

why a thermostat? wouldn't u need to measure the load not the
temperature? so buy a device that will meausure the watts and then when
it gets above 8 or 9 watts activate the fan

you could. But ultimnately all that matters is heatsink temperature - if
it gets "too hot" turn the fan on; when its "cool enough" turn the fan
off. Its a whole lot easier and cheaper.

Cheers
Terry

 

[j.b. miller]

It may not be as easy as putting a 'stat in the box! If the fan is
'smart',ie: has a tach pin, then the invertor should shut down if it doesn't
see the fan spin. At least that's the way I've designed productsthat needed
fans for cooling.
Check the fan and see if it has 3 wires, if so, i has a tach in it.
jay

 

[Mac]

On Wed, 02 Mar 2005 13:52:50 -0800, david.haine wrote:

I have a 12VDC - 240VAC pure sinewave inverter and I want to stop the
cooling fan from operating when there is no load. The minimum load is
7W and max load 30W.

What is meant by no load? It seems to me that if the minimum load is 7W,
then there will never be "no load," and the fan will therefore always be
on in your scheme to "stop the cooling fan from operating when there is no
load."

Obviously, I'm being too literal-minded, but I am also genuinely perplexed.

For example, if "no load" really means "7 Watt load," then I guess I
wonder how you can be sure that the fan is not needed?

--Mac

 

[Terry Given]

Mac wrote:

On Wed, 02 Mar 2005 13:52:50 -0800, david.haine wrote:


I have a 12VDC - 240VAC pure sinewave inverter and I want to stop the
cooling fan from operating when there is no load. The minimum load is
7W and max load 30W.


What is meant by no load? It seems to me that if the minimum load is 7W,
then there will never be "no load," and the fan will therefore always be
on in your scheme to "stop the cooling fan from operating when there is no
load."

Obviously, I'm being too literal-minded, but I am also genuinely perplexed.

For example, if "no load" really means "7 Watt load," then I guess I
wonder how you can be sure that the fan is not needed?

--Mac

and if some rat bastard like me implemented a constant-loss algorithm to
minimise dT, then switching the fan off based on output load would be a
very bad idea. Highly unlikely in a poxy little inverter though.

Cheers
Terry