On Wed, 06 Jul 2005 11:09:19 +1000, you wrote:
> At 09:12 AM 6/07/05 +0930, you wrote: >>Hi Peter >> >>I can get these flashlights through a friend of mine. >>He is even making one available for trails. >>I will find out how much they cost and will get back to you. >>If you like, you can be the guinea pig and pay me when you >>are happy. >> >>The flashlight draws under 20 watt. >> >>Bernard Eckey > > > Umm , how much under 20 watta? 20 watts at 12 volts is about 1.7 amps! If > it is anything like that continuous then you'd better have a BIG battery. > I suspect that it draws 20W while the light is on, and something much less when it is off, so assuming two short pulses of 100 mS each, repeated each second could give a duty cycle of about 0.2, and thus an averge load of 20 x 0.2 = 4W, or 333 mA. Still quite high, but a fairly new 7.2 AH battery should last about 7.2/0.333 + 21 hours (with no other load, of course) Cheers, John G. _______________________________________________ Aus-soaring mailing list [email protected] To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring
