they killed the nice form factor 750xl, it sucks its a tower now On Tue, Jan 20, 2015 at 6:54 PM, Josh Luthman <[email protected]> wrote:
> 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? >>> >> >> > -- All parts should go together without forcing. You must remember that the parts you are reassembling were disassembled by you. Therefore, if you can't get them together again, there must be a reason. By all means, do not use a hammer. -- IBM maintenance manual, 1925
