 |
30-01-2013, 17:39
|
#1
|
Registered User
Join Date: Jul 2012
Location: Townsville, Qld, Australia
Boat: William Bollard, Gypsy Wave, 28'
Posts: 144
|
1000 Watts at 240 Volts AC is How Many Watts at 12 Volts DC
Hi There,
I have scrounged the net and found other amps to watts and voltage calculations, but either haven't found or don't know how to find the answer to this question.
Does anyone know how to work it out as im trying to figure out the consumption or a device that i want to run off my inverter.
Thanks in advance
Matthew
__________________
Do but once what others say you cant, and you will never be judged by their limitations again.
|
|
|
30-01-2013, 17:46
|
#2
|
Senior Cruiser

Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,prout snowgoose 37 elite catamaran!
Posts: 10,598
|
Re: 1000 Watts at 240 Volts AC is How Many Watts at 12 Volts DC
VIR
1000w divided by 240v=4.2 amps
240v divided by 12v= 20
20 x 4.2=84 amps@12v
12x 84=1008 watts
rounded off the initial ampage but a 1000watts is a thousand watts!
|
|
|
30-01-2013, 17:48
|
#3
|
Registered User
Join Date: Mar 2006
Location: Tampa Bay area, USA
Boat: Beneteau First 42
Posts: 3,961
|
Re: 1000 Watts at 240 Volts AC is How Many Watts at 12 Volts DC
Matthew--
Watts is watts = Amps mutiplied by Volts. 1000 Watts at 240 volts indicates an energy burn of 4.17 amps. 1000 watts at 12 volts indicates an energy burn of 83 amps. It's the amps that matter.
FWIW...
__________________
"It is not so much for its beauty that the Sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."
|
|
|
30-01-2013, 17:58
|
#4
|
Registered User
Join Date: Jul 2012
Location: Texas - USA
Boat: Twin Otter de Havilland Floatplane
Posts: 1,838
|
Re: 1000 Watts at 240 Volts AC is How Many Watts at 12 Volts DC
Power (Watt) = I (Amp) x V (Volt); one of Ohm's laws. The wattage resulting from either an AC or a DC circuit is the "same quantity". It gets a little complicated when an inverter is involved. Reputable manufacturers of inverters publish charts depicting the actual loss of power from the conversion. Use a ball park figure of 45% loss, to get a rough estimate. (Make sure your circuit is "fused" correctly to avoid a fire.) Mauritz
|
|
|
30-01-2013, 18:13
|
#5
|
Registered User
Join Date: Dec 2009
Posts: 2,959
|
Re: 1000 Watts at 240 Volts AC is How Many Watts at 12 Volts DC
The Ampere calcs above are for simple resistive loads. If there is a large motor or big switching power supply being driven the calculation must consider the power factor and start-up current.
|
|
|
30-01-2013, 18:27
|
#6
|
Registered User
Join Date: Dec 2010
Location: W Carib
Boat: Wildcat 35, Hobie 33
Posts: 13,500
|
Re: 1000 Watts at 240 Volts AC is How Many Watts at 12 Volts DC
What make and model of inverter? Look up manufacturer's specs for estimated loss.
|
|
|
30-01-2013, 19:47
|
#7
|
Registered User
Join Date: Jul 2012
Location: Townsville, Qld, Australia
Boat: William Bollard, Gypsy Wave, 28'
Posts: 144
|
Re: 1000 Watts at 240 Volts AC is How Many Watts at 12 Volts DC
A BIG THANK YOU EVERYONE
i dont know why that was so hard for me to figure out, but you guys all nailed it right on the head, cheers.
Matthew
__________________
Do but once what others say you cant, and you will never be judged by their limitations again.
|
|
|
30-01-2013, 20:14
|
#8
|
Registered User
Join Date: Sep 2012
Location: Wilbur By The Sea, FL
Boat: Catalina 30
Posts: 661
|
Re: 1000 Watts at 240 Volts AC is How Many Watts at 12 Volts DC
Wait, are we talking RMS or peak to peak?
|
|
|
30-01-2013, 22:14
|
#9
|
Moderator
Join Date: Feb 2010
Location: La Ciudad de la Misión Didacus de Alcalá en Alta California, Virreinato de Nueva España
Boat: Cal 20
Posts: 21,619
|
Re: 1000 Watts at 240 Volts AC is How Many Watts at 12 Volts DC
Quote:
Originally Posted by resilientg
Hi There,
I have scrounged the net and found other amps to watts and voltage calculations, but either haven't found or don't know how to find the answer to this question.
Does anyone know how to work it out as im trying to figure out the consumption or a device that i want to run off my inverter.
Thanks in advance
Matthew
|
1000w @ 240v-ac is equal to 1000w @ 12v-dc plus or minus conversion inefficiencies that will depend on what method of conversion you use and which side has the 1000w vs which side needs the 1000w.
If you need 1000w on the ac side, then you will need more than 1000w on the dc side, I'd guess 100amps to be safe.
__________________
Num Me Vexo?
For all of your celestial navigation questions: https://navlist.net/
A house is but a boat so poorly built and so firmly run aground no one would think to try and refloat it.
|
|
|
 |
Thread Tools |
Search this Thread |
|
|
Display Modes |
Rate This Thread |
Linear Mode
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
Advertise Here
Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
Vendor Spotlight |
|
|