Invertor problem in my car...advice sought please.....?

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Andy

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I have a 400 Watt invertor in my car to run some equipment. Here is the link for it :-

www.maplin.co.uk/Module.aspx?
ModuleNo=227114

It is a 400W Black and decker invertor
Trouble is, if I turn off my car engine and restart the engine it goes into auto shutdown. The other problem I have is that if I use my laptop PSU with it, it also goes into shutdown.....have I just bought a bad invertor?...could anyone recommend a better more robust one ?
I am only using about 120 Watts in total so I have plenty to spare....it's driving me nuts....I have to sort it out today!!!

Thanks in advance guys

Andy
 
The auto shutdown is to prevent you draining your battery. Are you using the cig lighter? Or is the inverter connected straight to the battery?

Try connecting it straight to the battery, turning off your ignition is maybe triggering the auto shutdown thru the cig lighter socket?

Just read on maplin site that you can only draw 100watts when using it thru the cig lighter socket
 
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