120 w Inverter

Submitted: Monday, May 03, 2010 at 09:27
ThreadID: 78185 Views:2106 Replies:5 FollowUps:1
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For the electrically minded.
Looking around this morning at the stuff i want to take away with us there is a lot of gear that will require to charged up at some point in time. ie phones, cameras maybe the laptop etc.
I have a Projecta 120 w inverter power can.
Will this be sufficient to charge these items and what will be the draw on the battery be like?


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Reply By: Member - joc45 (WA) - Monday, May 03, 2010 at 10:12

Monday, May 03, 2010 at 10:12
Lots of posts on this one, but basically, you'll have trouble running your lappy on that inverter. Get a cheap DC-DC converter for that. The rest should be fine.

AnswerID: 415188

Follow Up By: Member - joc45 (WA) - Monday, May 03, 2010 at 12:44

Monday, May 03, 2010 at 12:44
I should have added: try it first!
Nothing to lose.
One item at a time though.
FollowupID: 685376

Reply By: Member - Fred B (NT) - Monday, May 03, 2010 at 10:12

Monday, May 03, 2010 at 10:12
Need more info, but max current draw for the inverter should be 10 Amps. Depends on what you are running off it. have sent you an MM.
Fred B
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AnswerID: 415189

Reply By: Battery Value Pty Ltd - Monday, May 03, 2010 at 12:03

Monday, May 03, 2010 at 12:03
Hello Greg,

if you power some 240V switched supply via an inverter, expect around 60 to 65% overall efficiency (switching losses and PF).

So based on your 120W inverter, the maximum power you can expect from your switched power supply is around 72W.
This figure is about border line if you want to power a current dual processor laptop PC. For most apps and processes running concurrently on the lappy this should be sufficient though. If not, the common thing to do is to limit the number of open windows, throttling the processor speed, shutting down M$ apps etc.

The car battery will see a drain of around 12 amps during this time.

Best regards, Peter
AnswerID: 415208

Reply By: get outmore - Monday, May 03, 2010 at 13:12

Monday, May 03, 2010 at 13:12
I use a dick smith 250w inverter

I suspect your lappy might struggle - they use alot more power than youd think

I have to either have the vehicle going or connect direct to the battery because te cig plug wiring isnt enough to run laptop
AnswerID: 415214

Reply By: R&J Batteries - Tuesday, May 04, 2010 at 07:58

Tuesday, May 04, 2010 at 07:58
As already stated - the DC load will be around 10Amps (120W / 12V = 10A) ignoring efficiency, power factor, etc.

BEWARE! I have heard of dashboard fires starting from plugging an inverter into a cigarette lighter socket. Make sure wherever you are plugging it in can supply at least around 15A. Cigarette lighter sockets are designed for cigarette lighters and usually have very small wire going to them.

AnswerID: 415293

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