12 volt to 240v invertor

[photoman290]

if the tv has a switch mode power supply it will be fine on a MSW one. the sine wave ones are not as efficient as the MSW ones.

[Rotary-Motion]

i will check that switch after i buy one...

so a pure sine wave is a much steady voltage and will run any delicate instrument but a modified sine is more efficient? how do you mean it uses less 12v power? is there much difference PM?

[photoman290]

the battery will go flat quicker with a sinewave  one. if you are going to use it at full power on 12 volts it will be drawing 82 amps at  1000watts. volts x amps = watts that means big cables. and a flat car battery in about 1/2 hour if you use it at full power.

[Rotary-Motion]

how many watts in 1 amp, maybe easyer to work out potential load...

goodle is giving me mixed results

http://answers.yahoo.com/question/index?qid=1006041612376

i was lost when i got here:

Watts = Amps X Volts. You need to know the voltage drop across the resistance.
 Volts = Amps X Resistance to find the voltage

then read this:

http://answers.yahoo.com/question/index?qid=20090814130822AAamid4

and now no idea, i think just buy one and chuck it all on and see...

and this page says:

http://www.powerstream.com/Amps-Watts.htm#watts-amps

so say 600 watts x 12volts = 7200 amps?

[Chug]

I blew two inverters up in one day in my motorhome, first I spilt tea over my 1000w 24v one fizz pop dead!

So I then dug out my old 12v 300w one and used that until the leisure batteries started dying, and wouldn't give 12v anymore then I wired it across the terminals as you would for 24v and got 14v great it worked again..

Later I started the engine and heard the 12v inverter (now getting 24V, or more like 26-28V) start hissing and saw it smoking... then dead DOH!

[Bio Dervotee]

Hi, RM,JH, einstein lol
amps = watts divided by voltage, so 600 watts is 50 amps@12volt
r=voltage divided by current,    so 60 watt headlamp at 12volts uses 5 amps , resistance would be 2.4 ohms
If you know any two, you can work out the other two.
Resistance = voltage divided by current
voltage = current x resistance
current = voltage divided by resistance
watts = voltage x current
hope this helps
Will
ps         E=MC squared

[Rotary-Motion]

i got a fridge thats 85 watts how long would a 100AH leisure battery last?

[photoman290]

not very long on a small MSW inverter. is it 240 volts or is it a  multipower one with 240 12v or gas ? if it is 12v you dont need an inverter. if it has a compressor you need an inverter at least 10 times the current rating
or it will either not start or kill the inverter.  so a 1kw one at least. even then make sure you can return it when the smoke comes out.
7 amps in answer to the question but taking losses into account nearer 9 amps  so if you go to 50% of the battery capacity that is about 7 hours. but you will kill the battery very quickly if you do that too often.  4 hours would be kinder to the battery. fridges are the worse thing to try and run off a battery. i have a gas one. that costs about £5 a week in gas. if you are thinking of using it to keep your beer cool on trips the best thing is to  fill the home freezer with cool packs and use them.

[Rotary-Motion]

12v 85 watts

[K.H]

Dont kill my inverter!

[photoman290]

Dont kill my inverter!

 just clean all the melted plastic up and  blow the burnt smell out with a hoover. he wont even notice.

[Rotary-Motion]

its not 240v shame