Excellent info. Thanks Bill!!
Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Tue, Jan 20, 2015 at 7:50 PM, Bill Prince <[email protected]> wrote: > I generally figure about 10% loss for each conversion. Some inverters and > some power supplies will be better and/or worse. > > So converting from DC to AC, you have roughly 90% of what you started > with. Going from AC to DC you'll end up with 80% of what you started with. > > If you want 70 watts for 4 hours, or 280 watt hours, you will need ~~ 560 > watt hours of battery for a DC solution. That roughly equates to 700 watt > hours for a UPS solution. > > If you're using 12 volt batteries, your UPS could use anything over 60 AH > per battery. > > If you go with DC-only, you could get by with 47 AH per battery. > > Your best battery choice is AGM. They can be discharged deeper than most > of the other types (gel, wet). > > bp > <part15sbs{at}gmail{dot}com> > > > On 1/20/2015 3:50 PM, Josh Luthman wrote: > >> This will be indoors. I'm aiming to get 280 watt hours (70 watts, 4 >> hours) of run time. Is there any idea as to the inefficiency of the whole >> AC/DC/AC/DC process? >> > >
