Thanks, Craig. I'm leaning toward Rodger's solution because it probably lasts longer. Best wishes, Joe --- On Wed, 10/21/09, Craig Smith <cs2560@gmail.com> wrote: From: Craig Smith <cs2560@gmail.com> Subject: Re: [Utah-astronomy] Private Observing Calendar? To: "'Utah Astronomy'" <utah-astronomy@mailman.xmission.com> Date: Wednesday, October 21, 2009, 10:02 PM There are several versions out there. I didn't think laptops required much power, but my laptop requires about 20V at about 4 amps. That would be about 7 amps at 12 V. Celestron makes one that is 17 amp hours (they also make a 7, and Orion has a 12), which means it would work for about 2.5 hours. Not as much as I had hoped, but perhaps coupled with the laptop's battery it might be enough. The screen and the disk drive require the most power, so if you don't need those much you'll be better off. You can set your disk drive to turn off after a period of non-usage even when it's plugged in to something, but I guess it needs it to record the images. If you're doing a few long exposures it would be better than a bunch of short exposures I guess. -----Original Message----- From: utah-astronomy-bounces+cs2560=gmail.com@mailman.xmission.com [mailto:utah-astronomy-bounces+cs2560=gmail.com@mailman.xmission.com] On Behalf Of Joe Bauman Sent: Wednesday, October 21, 2009 9:00 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] Private Observing Calendar? What's a power tank? That sounds interesting. Thanks, Joe --- On Wed, 10/21/09, Craig Smith <cs2560@gmail.com> wrote: From: Craig Smith <cs2560@gmail.com> Subject: Re: [Utah-astronomy] Private Observing Calendar? To: "Utah Astronomy" <utah-astronomy@mailman.xmission.com> Date: Wednesday, October 21, 2009, 5:53 PM Some of the generators are pretty quiet these days, but I would think a power tank or car batter would do just fine. On Wed, Oct 21, 2009 at 2:27 PM, <stormcrow60@xmission.com> wrote:
Hi Joe, Just a suggestion... have you considered an electrical car adaptor? You would need to run your auto for a length of time to recharge your laptop battery, but if parked far enough away, it would not be a problem.
Jon
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