Question about Whistler Power Inverter

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I will like to know if one can get an inverter that can server for about 20hrs or so

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You haven't supplied enough information. An inverter only converts 12V DC to 115V AC. There are some battery packs with inverters, but that's not what you asked about. The time it "serves" is dependent on the load being connected and the battery(s) that the inverter is being supplied from. Go to a web site such as :
You can learn a lot about inverters here.

Posted on Jul 13, 2010

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Posted on Jan 02, 2017

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