Ahmed weote: > I looked at all the pretty pictures and the verbiage in the Inverter > Inefficiency section and concluded the author is not being fair to the > Inverter manufacturer. Arild, Norm, Andina or another electrical person on > the list can explain why. > Assuming the DC bus was 12.5Volts and assuming the TV input power stays > the same < snip>
REPLY Well that got my attention and peaked my curiosity. <VBG> Ahmed, you are right. The author made way too many assumptions and did not state what those were. It's not everyone's cup of tea to obsess abiut saving a watt here and there. People with money hire designers like me to build them a system that works. If saving every watt is a concern, they generally tell me up front and we design from there. If convenience is more important we create a different system. For people who like to obsess over saving a few watts here and there, Ask me how. I won't bore the list with a detailed comment on what that blog site posted. Only two points are important for everyone to remember. 1. Every piece of equipment has a performance CURVE. Depending on what point on the curve you use it, efficiencies will vary from the advertised optimum rating. 2. A 12V DC system does not operate at 12.00V Depending on state of charge in battery and whether any charging sources are active, such as solar, wind, engine or whatever, the system voltage varies from 14.V to a low of 11.1V or even worse, 10.5V That is over 3 volts out of 12 or in round numbers a 25% variance. Hardly any consumer equipment is designed to work properly over this full range. Most of them are designed and rated to work at 13.6V unless otherwise stated. Trying to run a device at less than optimum voltage usually means it pulls more current for the same wattage. This in turn often mean you shorten the service life of the device. You pays your money and takes your chances. < smile > Cheers Arild _______________________________________________ Liveaboard mailing list [email protected] To adjust your membership settings over the web http://www.liveaboardnow.org/mailman/listinfo/liveaboard To subscribe send an email to [email protected] To unsubscribe send an email to [email protected] The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/ To search the archives http://www.mail-archive.com/[email protected] The Mailman Users Guide can be found here http://www.gnu.org/software/mailman/mailman-member/index.html
