Tom, Thanks, that is kind of what I thought but didn't consider the efficiency rating. I hope that I can get the amp hour rating of the battery. I believe that these inverters are designed to charge lap tops etc but will try and verify. I had no problem charging Trekker and my grandson's game system with the 90W unit. Lenny ----- Original Message ----- From: "Tom Fowle" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, September 02, 2008 6:41 PM Subject: Re: [BlindHandyMan] power inverters
Lenny, The input power, volts times amps, will reflecct the required output load times some efficienty factor. Unless the manual says how efficient it is, I'd use 60% as a guess. You'd have to know the power requirements of each load, add them together and and call that 60% of what'd be required from the 12 volt system. If you know the ampere hour rating of your battery, multiply it times 12 to get a very rough approximation of power hours availab.e don't even come close to expecting that kind of total power, you might presume you'd get half the estimated total power from the battery before it gets so low you won't start the engine again. On the other hand modern electronics don't take all that much power unless they are making a lot of noise or heat. Make sure your inverters are designed for electronics, some are only intended for lights or motors and don't produce a good enough sign wave form or good enough frequency and voltage regulation to keep electronics happy. Hope that helps some, but probably not <GRIN> Tom Fowle ------------------------------------ Send any questions regarding list management to: [EMAIL PROTECTED] To listen to the show archives go to link http://www.acbradio.org/pweb/index.php?module=pagemaster&PAGE_user_op=view_page&PAGE_id=33&MMN_position=47:29 Or ftp://ftp.acbradio.org/acbradio-archives/handyman/ The Pod Cast address for the Blind Handy Man Show is. http://www.acbradio.org/news/xml/podcast.php?pgm=saturday Visit The Blind Handy Man Files Page To Review Contributions From Various List Members At The Following address: http://www.jaws-users.com/JAWS/handyman/ Visit the archives page at the following address http://www.mail-archive.com/[email protected]/ If you would like to join the JAWS Users List, then visit the following address for more information: http://www.jaws-users.com/ For a complete list of email commands pertaining to the Blind Handy Man list just send a blank message to: [EMAIL PROTECTED] Groups Links __________ NOD32 3409 (20080902) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com
